View Full Version : Daily contest - Old problems and solutions
This thread will have copies of old problems and solutions to them as well as all relevant discussions. Please see new stiky thread for new Daily contest.
OK, the contest has been started. Here is position number 1. It is one of my all-time favorites.
It is worth 3 points.
http://www.civ3duelzone.com/forum/uploaded/akots/20041028225823_puzzle2.JPG
30.48šKB
Position is from the game played in 1972 in a tournament. Black to move first. In the actual game, black (a grandmaster) played 1... Qf2xf1. This is not the best move. Can you find one?
Hint: the final blow in the main variation is delivered by black rook. There is also a side variation, not important since it is a sure loss for white anyhow.
Please pm your answers to akots no later than 6am GMT October 29th and don't post it in this thread since it will spoil the fun for the others. At 6am GMT the answer will be posted here.
OK, it is 6am GMT. The first contest has been finished. There were 3 submissions! Should be more but the problem has been posted a bit too late, sorry about that.
1. Krys has solved the puzzle completely and receives 3 points!
2. Kingreno made great progress by submitting 2 first correct moves but then got confused and did not get any points.
3. Dell19 also submitted 2 first moves correctly but then had a problem with the decisive move.
Here is the solution:
1. ... Rf8-g8+
2. Kg5-h6 (Other moves would lead to 2. ... Qf2xh2 mate)
2. ... Qf2xh2+
3. Re5-h5 (The only possible move for white)
This is the resulting position:
http://www.civ3duelzone.com/forum/uploaded/akots/2004102972112_puzzle1b.JPG
31.05šKB
As you can see, if not for the white Queen, it could have been mate on g6 by a black rook. So, solution there would be
3. ... Qh2-d2+!!
4. Qd3xd2 Rg8-g6 mate, a very rare and beatiful mate!
White were certainly able to defend with 4. Rf1-f4 but then they are losing their Queen (4. ... Qd2xd3) and cannot defend against multiple threats made by the black.
Here is the final position of the main variation:
http://www.civ3duelzone.com/forum/uploaded/akots/2004102972645_puzzle1c.JPG
30.47šKB
Saw this one too late [sad] Congrats krys!
Position number 2 is also taken from the real game played in 1952. No grandmasters this time, so solution is worth 1 point.
Start:
http://www.civ3duelzone.com/forum/uploaded/akots/2004102973153_puzzle3-36.JPG
27.63šKB
In this situation white decided to win a rook (why not?) by playing 1. Ba2-b1. However, this has been a not-so-extremely-well-thought-out decision leading to disaster. Please explain why and how black can win in case of this move.
Please pm the answers to me no later than 6am GMT October 30.
sjees... you are posting results faster that I can spot puzzles!
I noticed puzzle 1 this morning as I arrived at work, resolved it but you posted the sollution before I had the chance to PM you..
Please give us Europeans more time as we sleep when your clock is ticking.
Banzai!
I'm sorry about that. Please be assured there will be full 24 hours to solve all the following problems.
Solution to position number 2:
1. Ba2-b1?? h5-h4+
2. Kg3-g4 f7-f5+
3. Ra5xf5 Rc2-g2 mate
Final position is well worth a diagram:
http://www.civ3duelzone.com/forum/uploaded/akots/2004103073954_puzzle3-36a.JPG
29.68KB
First thing first, there is a new problem to solve. Position number 3 is taken from a real game played in 1820s. That was a long time ago, so it looks somewhat unusual. The game has been played by two very famous French players of that time with so-called "Partie des pions" rule. Each of the player could have replaced every piece with a pawn. But the actual position and its solution are 100% compliant by the normal standard modern rules. So, please, don't try to replace the pieces with pawns. This is not required to solve it.
Also, apparently, on weekends there might be more time available, so I will try to adjust the difficulty and make it easier on weekdays.
Start:
http://www.civ3duelzone.com/forum/uploaded/akots/2004103071229_puzzle4-49p.JPG
32 KB
White to move and to give mate to the black. In approximately 5 moves. There are two variations in this problem starting from black move number 1. Solution of only one variation brings 3 points and solution of both variations will bring 6points. Both variations are very beautiful!
Please pm the answers to me no later than 6am GMT October 31.
This one (number 3 is very beautiful indeed:
First move is evident:
1. KNg4xh6. Then black have two possibilities:
A)
1. ... Kg8-h8
2. KNh6-f7 Kh8-g8
3. Qc3xg7+!! Kg8xg7
4. Bh4-f6+ Kg7-g8
5. KNf7-h6 mate
B)
1. ... g7xh6
2. Qc3-h8+!! Kg8xh8
3. Ke7-f7!! Rb8-f8+ (3. ... Rb8-g7 does not help as well)
4. Kf7xf8 and next move will be
5. Bh4-f6 mate
Position number 4 is a "classical" problem, not a situation from an actual game. The problem has been composed in 1936. It is rather straightforward, only one minor variation.
Start:
http://www.civ3duelzone.com/forum/uploaded/akots/2004103162250_puzzle5-50p.JPG
26.8 KB
White to move and to give mate in 3 moves. Solution brings 3 points.
Please pm the answers to me no later than 6am GMT November 1.
Correct solution for number 4:
1. KNh6-f5! Bc3xh8 (Otherwise Rh8-h1+)
2. KNf5-g7 Bh8xg7
3. Bf8xg7 mate
1. Rh8-g8 does not give mate in 3 because of 1.... Bc3-d4!
Socrates
01-11-2004, 15:30
Mmmmh, you forgot to tell who won Problem 4. (EDIT : nevermind, it looks like your edited posts in the sticky thread weren't seen as new stuff in "active users")
About your solution I tend to disagree. Though it's rather simple after the 1st move, what if Black do 1. ... Be1 ? The white rook moving to h1 ends up in statlemate !! See my PM about the white bishop entering the scene...
quote:Originally posted by kryszcztov
... About your solution I tend to disagree. Though it's rather simple after the 1st move, what if Black do 1. ... Be1 ? The white rook moving to h1 ends up in statlemate !! See my PM about the white bishop entering the scene...
It is a bit evident IMO. If 1. KNf5 Be1, then 2. Bg7+ Bc3. 3. Rh1 mate.
Chess is that kind of game where you cannot be exhaustive and overdetailed. Some things are just too simple to worth mentioning. In general, just indicating that 1. KNf5 is a solution would be probably enough for a 3-move problem. :)
Position number 5 is a "classical" position composed by del Rio in 1750.
Start:
http://www.civ3duelzone.com/forum/uploaded/akots/20041116250_puzzle-11-01-1point-52p.JPG
30.14 KB
White to move and to give mate in 3 moves. Solution brings 1 point.
Please pm the answers to me no later than 6am GMT November 2.
Solution is very straightforward and simple:
1. KNf8-e6+
A)
1. ... f7xe6
2. Qf4-f8 mate
B)
1. ... Kg7-g8
2. Qf4-b8+ and then mate on next move
C)
1. ... Qxe6
2. Qf4-h6+! Kg7xh6
3. Be7-f8! mate
variation C) is very good looking expecially in the end. Position is 250 years old and is still fascinating! :)
Ches is immortal!!! Hail to Kasparov!!! Well, never mind...
Socrates
02-11-2004, 12:07
quote:Originally posted by akots
Hail to Kasparov!!!
Hail to kryszcztov !!?? [blush]
Rik Meleet
02-11-2004, 23:59
quote:Originally posted by kryszcztov
Mmmmh, you forgot to tell who won Problem 4. (EDIT : nevermind, it looks like your edited posts in the sticky thread weren't seen as new stuff in "active users")
About your solution I tend to disagree. Though it's rather simple after the 1st move, what if Black do 1. ... Be1 ? The white rook moving to h1 ends up in statlemate !! See my PM about the white bishop entering the scene...
1: Nh6-f5 - Bc3-e1
2: Nf5-d4 - anything
3: Nd4-b3 mate
So, in any case, 1. KNh6-f5 is the only move which solves problem number 4. Subsequent variations don't matter much. The one given in post #12... I just like it more than others. And it is the most logical move for the black to capture the rook. :)
Position number 6 is from actual game played in 1960.
Start:
http://www.civ3duelzone.com/forum/uploaded/akots/200411263720_puzzle-11-02-1point-47p.JPG
35.05 KB
White to move and to win. Mate or no mate, does not matter, just win and win big... Solution brings 1 point since it is rather straightforward and simple. But very beautiful.
Please pm the answers to me no later than 6am GMT November 3.
Solution is rather simple:
1. b2-b4! and white win at least a piece.
For example, 1. ... Qa5-d8. 2. Qd4xf6+! Kg7xf6. 3. Bc1-b2 mate. Or, 2. ... Kg7-h6. 3. f4-f5 +/- (+/- means white win by decisive advantage; conversely, -/+ means black win by decisive advantage). So, the only reasonable defence is 1. ... KNe7-c6 but after simple 2. d5xc6 white have won extra piece and still black position is in ruins. It is also possible to play 1. Bc1-d2 with the similar idea. In this case, the only reasonable move is 1. ... Qa5-c5 and white cannot continue 2. Qd4xf6+ because after 2. ... Kg7xf6. 3. Bd2-c3+ black can play 3. ... Qc5xc3 -/+. Still, advantage of the white is great and they can probably win in case of 1. Bc1-d2. However, this cannot be considered as a solution IMO.
Ribannah
03-11-2004, 11:12
Positionally, white can maintain his advantage by 1.Be3, but you're right: that doesn't count as a solution.
Socrates
03-11-2004, 12:02
Banzai and I had a chat about Problem 6, after both sending our PMs. And Banzai came up with 1. ... Nf5, which threatens the white queen as the other move to c6. The idea of Black being that if the pawn takes the black knight out (2. exf5), the black queen moves to d8 to cover the check on f6. And if White immediately rushes to check on f6, then Black takes the queen out and gets an exit on e7... So all in all, White can "only" win the knight, but that should be sufficient. [goodjob]
BTW, I don't know why you said "+/-" after : 1. b4 Qd8 2. Qxf6+ Kh6 3. f5+ ? As I see it, it immediately leads to mate, apart from the black queen interfering on the white bishop's diagonal, since the black pawn on g6 can't move. See my PM...
Ribannah
03-11-2004, 13:04
Akots, the line 2...Kg8 3.Bc3 should also be mentioned if you want to be complete. ;)
In position #7, White's pawn d5 should be a bishop.
barbu1977
03-11-2004, 13:54
Is there a program where you can set up boards to do the problems. A mate in 4 is a bit long to do mentaly.
quote:Originally posted by Ribannah
In position #7, White's pawn d5 should be a bishop.
If White's pawn on d5 would be a bishop it would be mate in 2.
I think it should be 'Black to move and mate in 4' instead of 'White to move...'.
Banzai!
Socrates
03-11-2004, 15:02
quote:Originally posted by barbu1977
Is there a program where you can set up boards to do the problems. A mate in 4 is a bit long to do mentaly.
That's the point, barbu ! Being able to solve problems mentally. In real matches, you aren't allowed to touch any piece of course. But you could also set up the problems with your own chess board. I guess this is allowed, but being able to do it mentally is the real reward ! ;)
About Problem 7, well, I'm waiting for akots to speak because I haven't been able to solve it so far ! :D
In positon number 7 black are to move. Positioin is correct, no bishop on d5 but pawn. I'm sorry, it was election night and I was watching TV. The post has been edited to reflect this.
@barbu1977: The goal of the contest is to excercise the brain, not mouse-clicking skill. I'm sure Fritz or Chessmaster can solve almost anything.
quote:Originally posted by Ribannah
Akots, the line 2...Kg8 3.Bc3 should also be mentioned if you want to be complete. ;)
In position #7, White's pawn d5 should be a bishop.
There are many variations but they are redundant enough and not worth mentioning.
Positon 7 has been corrected. Black is to move, sorry again.
Ribannah
03-11-2004, 19:19
quote:Originally posted by akots
quote:Originally posted by Ribannah
In position #7, White's pawn d5 should be a bishop.
Positon 7 has been corrected. Black is to move, sorry again.
That works as well.
barbu1977
03-11-2004, 19:48
quote:Originally posted by akots
@barbu1977: The goal of the contest is to excercise the brain, not mouse-clicking skill. I'm sure Fritz or Chessmaster can solve almost anything.
Not that I wanted a computer to do my job, sometimes you just think you know the first move, and it works better when you can see which peices have been moved.
Of course with the right player to move, I do not need a board to set things up...;)
Rik Meleet
03-11-2004, 19:59
Krys: I've had a discussion with akots about problem 6 as well. Shall you and I look at it at Beam's ?
Socrates
03-11-2004, 20:39
Rik, sure. Why ? Did you find something ? In any case we'll have a look at it in Breda.
Also I wanted to say that, trusting Banzai on an issue dealing with a little chess contest that has nothing to do with the prestige earned by the GOTM event eg., I'd like to see Banzai getting the 3 points he missed for Problem 1. He submitted the correct solution to akots, before actually reading the solution, but after akots had posted it. Up to you akots, but since I like things to be fair, and since Problem 1 was rushed out of the door, it would be great. Not to add that it will likely increase my motivation. ;) If any other guy is in the same position, please feel free to speak up.
Well thank you Krys, but there is no need for that...I'll beat you without those points anyway ;)
Banzai!
Dunno, I can put out some really tough thing, like a 10-point-worth position??? Or 15-point-worth one? Just to settle the issues between Krys and Banzai once and for all?? Let me know if you want that, I have a few candidate problems. This might also give a chance for some other participants who are slightly behind.
@barbu1977: Do you have a board with pieces? I don't know of any program that is just a "player" without some engine-brains behind it.
Rik Meleet
03-11-2004, 21:54
Krys: akots showed me where I was wrong in:
1: b2-b4 - Qa5-d8
2: Bc1-b2 - Ne7-g8
3: e4-e5 (?)
If you are going to do harder puzzles, could you also post an easier one at the same time?
Sure, whatever you would like! It can be like a bonus puzzle for those who like to make curls out of their brains. Can make it from 10 and up. Probably to 15-17. Not sure if 20 can be possible. And can give whole weekend to solve it then.
Position number 7 is from actual game played in 1872.
Start:
http://www.civ3duelzone.com/forum/uploaded/akots/200411362416_puzzle-11-03-1point-66p.JPG
35.05 KB
Black to move and give mate in 4. Solution brings 1 point, no side variations.
Please pm the answers to me no later than 6am GMT November 4.
Solution:
1. ... Bh3-g2+
2. Rg1xg2 Qf2-f1+
3. Rg2-g1 KNf5-g3+
4. h2xg3 Qf1-h3 mate :)
quote:Originally posted by kryszcztov
... Up to you akots, but since I like things to be fair, and since Problem 1 was rushed out of the door, it would be great. Not to add that it will likely increase my motivation. ...
Well, if it is up to me, I would honestly like someone who wins the contest to win it with a distinct advatage over the second place. No photofinish. Persistence is certainly rewarded but brilliance rules. It might be a good idea to have some really tough problems worth at least 10 points. I'll post one to solve over the weekend to get a feeling of it and see how it goes.
Position number 8 is from actual game played in 1977.
Start:
http://www.civ3duelzone.com/forum/uploaded/akots/200411453257_puzzle-11-04-1point-72p.JPG
31.77 KB
Black to move and win. Solution brings 1 point. There are 2 main variations with the same result.
Please pm the answers to me no later than 6am GMT November 5.
That one is cute:
1. ... Rb8xb1
2. Rf1xb1 Bg4-f5! Threatening Qh5-f3+
If 3. Rb1-f1 then 3. ... Qh5-e2 -/+
Socrates
05-11-2004, 11:30
Damn, I'm so happy ! After struggling hard with Problem 8, after hesitating a lot between different starts, it suddenly became clear. :) That was my hardest problem so far, but only worth 1 point ? [hmm]
Sorry, don't see anything particular unusual about that one. Don't know why you had to struggle hard either. Well, I was sort of hesitating and thinking of 2 points for this one but then decided on one point only.
Position number 9 is from actual game played also in 1977.
Start:
http://www.civ3duelzone.com/forum/uploaded/akots/20041156536_puzzle-11-05-1point-73p.JPG
34.67 KB
White to move and win, rapidly and deadly. In the original game, black resigned right on the spot so we just need to understand why they resigned. Solution brings 1 point. No variations needed here, only two first moves for the white (and the only defence for black on the first move).
Please pm the answers to me no later than 6am GMT November 6.
This one is very straightforward:
1. f5-f6 h6xg6
2. Qe4-g6! +/-
Socrates
06-11-2004, 12:23
No I searched after arriving in Breda, but what could I do after 3 beers and fucking spicy food ? :D Seriously, I didnt see the queen moving to g6 and just went to bed because the others would have let me alone otherwise ! [cry]
Certainly, you can try to solve the argument between you and Banzai by just playing a few games but make sure to remain sober since Banzai looks like a very formidable (if not excellent) opponent! Sorry for using hattrick grades, it is subconscious.
Socrates
06-11-2004, 20:57
I'd like to solve the problems but don't have time here. Maybe akots, you could extend the time for this weekend puzzles... Just my 2 cents. You can still release new puzzles as usual, just post the results later.
Sure, I'll edit the post to reflect the changes.
quote:Originally posted by akots
Certainly, you can try to solve the argument between you and Banzai by just playing a few games but make sure to remain sober since Banzai looks like a very formidable (if not excellent) opponent! Sorry for using hattrick grades, it is subconscious.
[blush]
Thank you Akots, but I am not really that good.. I just like to solve puzzles.
The puzzles of this weekend are... complicated!
So far I have not been able to solve any of them!
[help]
quote:Originally posted by Banzai
... The puzzles of this weekend are... complicated!
So far I have not been able to solve any of them!
Hehe... Well, at least you had a good party there. [evil]
Position number 13. Start:
http://www.civ3duelzone.com/forum/uploaded/akots/20041186643_11-08-129-2.jpg
43.36 KB
White to start and win with a beatiful mate. Solution brings 2 points.
Please pm the answer to me no later than 6am GMT November 9.
All moves are forced in this one:
1. Re7xe5+! f6xe5
2. g3-g4+ Kh5-h4
3. Qg7-e7+ Qe3-g5
4. g2-g3 checkmate
OK, big solution day! Solutions to positions number 10-12 and 13 will be announced.
We start with Position number 14:
http://www.civ3duelzone.com/forum/uploaded/akots/200411962336_11-09-126-1.jpg
42.7 KB
Back to start and give a gorgeous mate in approximately 3-4 moves. Solution brings 1 point. Sorry, earlier I have made a mistake in the solution which has been pointed out by Banzai.
Please pm the answer to me no later than 6am GMT November 10.
1. ... Qg2-f2+!
2. Qf4xf2 Rg5-h5+!
3. Bg4xh5 g6-g5 mate!
Looks at this, isn't it beautiful?
http://www.civ3duelzone.com/forum/uploaded/akots/200411105547_No14-end.jpg
Alternative defence may include, for example,
2. Qf4-g3+ Rg5xg4+
3. h3xg4 Rg2-h2 mate
Or 3. Kh4xg4 Qf2-f5+ and Qf5-h5 mate (this one takes 4 moves indeed, thanks to Banzai who has found this variation!)
Position number 10 - Bonus. Start:
http://www.civ3duelzone.com/forum/uploaded/akots/200411653534_11-06-bonus-7-420.jpg
40.42 KB
White to move and win, slowly but deadly. Solution brings 8 points. Two variations here, more or less similar result.
It is very difficult to belive that position like this can be won. Seem like sure draw. But it is not.
1. Qb4-a5+ Ka8-b8
2. Qa5-b8+ Kb8-a8
3. Nd6-b5! (threatening Nb5-c7 mate):
3. ... Qf3-b7 (only defence)
http://www.civ3duelzone.com/forum/uploaded/akots/200411106104_No10-1.jpg
40.31KB
4. Qb6-d8+ Qb7-b8
5. Qd8-d5+ Qb8-b7
6. Qd5-a2+ It now comes to two variations starting from this position:
http://www.civ3duelzone.com/forum/uploaded/akots/200411106137_No10-2.jpg
40.28KB
A)
6. ... Ka8-b8
7. Qa2-g8+ Qb7-c8
8. Qg8-g3+! Kb8-a8 (8. ... Kb8-b7 loses Queen to 9. Kb5-d6+)
9. Qg3-a3+ Ka8-b8 (again King cannot retreat to b7 due to Nb5-d6+)
10. Qa3-a7 mate!!!
http://www.civ3duelzone.com/forum/uploaded/akots/200411106171_No10-3.jpg
40.28KB
B) Just grants some extension on life support, does not change anything.
6. ... Bd1-a4
7. Qa2xa4+ Ka8-b8
8. Qa4-f4+ Kb8-a8
9. Qf4-f8+ Qb7-b8
10. Qf8-f3+ Qb8-b7
11. Qf3-a3+ Ka8-b8
12. Qa3-f8+ Qb7-c8
http://www.civ3duelzone.com/forum/uploaded/akots/2004111062213_No10-4.jpg
39.78KB
13. Qf8-f4+ Kb8-a8
14. Qf4-a4+ Ka8-b8
15. Qa4-a7 mate!
This is a rather famous puzzle composed in 1926.
Position number 11 - Bonus. Start:
http://www.civ3duelzone.com/forum/uploaded/akots/200411653934_11-06-bonus-12-279-kg.jpg
40.27 KB
White to move and to somehow make a draw which is obviously not easy. I was unable to solve it myself despite of repetitive tries. Kept me busy for about a week. Well, if somebody can solve it, he will be rewarded with 14 points! There is a few variations in this one and what I found especially difficult is to find the best moves for the black to exert additional pressure on the white.
Positions number 10 and 11 are bonus puzzles. Please pm the answers to me no later than 6am GMT November 10. Full 96 hours to solve. But it is quite a challenge.
It is a one-of-a-kind stalemate problems composed by Kasparyan in 1949. Took him three years to finish this one!!! Surely, not an easy nut to crack.
1. Bd6-e5+ Kh8-g8!
2. Rd5-d8+! (sure loss is 2. Rd5-d2 Qb7-f3+ 3. Qh3-h2 Qf3-h5+ -/+ as well as 2. Rd5-d3 Qb7-h7+)
2. ... Qg8-f7
3. Rd8-d3 Kf7-e6! (gaining an extra movement for the king to come in the battle):
http://www.civ3duelzone.com/forum/uploaded/akots/2004111063514_No11-1.jpg
4. Rd3-e3 Qb7-h1+
(4. ... Ke6-f5. 5. Kh3-h2 Qb7-h7+ [5. ... b3-b2. 6. Be5xb2 gives a known draw position where black cannot break inside the white's Rook-pawn-King fortress with their King] 6. Kh2-g1 Qh7-g6+. 7. Kg1-f1 Qg6-a6+. 8. Kf1-g1 results in positional draw)
5. Be5-h2+ Ke6-f5
6. Rd3xb3 Qh1-f1+
http://www.civ3duelzone.com/forum/uploaded/akots/2004111064456_No11-2.jpg
39.93šKB
7. Kh3-g3 Qf1-c4! (strong initiative and attack for black here but...)
8. Rb3-f3+ Kf5-g5
9. Bh2-g1! Qc4-g4+
10. Kg3-h2! Qg4xf3 stalemate and draw!
http://www.civ3duelzone.com/forum/uploaded/akots/2004111064832_No11-3.jpg
39.64šKB
Very few moves in this one are forced. That is why it is a very if not extremely difficult puzzle. It also requires advanced knowledge of the known endgame positions like Rook-pawn against Queen and a few others. I have tried to solve this one on a computer a while ago and Fritz 7 gave up on move 4 for the black. Stubborn machine believed Qh7+ was a better move and could not find Qh1+. Same result with Chessmaster-8. Sometimes, computers don't help at all! But Qh7+ gives an easy draw for the white indeed which actual analysis by computer itself confirms!
Position number 12 is regular, sponsored by Ribannah. Start:
http://www.civ3duelzone.com/forum/uploaded/akots/200411654931_11-06-Rib2-3.jpg
White to move and to give mate in 3. Solution brings 3 points.
Please pm the answer to me no later than 6am GMT November 10.
This one is really not so tough. Just a bit tricky.
1. Bd5-g8 solves it.
A)
1. ... e7-e6
2. Kc4-d3 Ke5-d5
3. Rf8-f5 mate
B)
1. ... Ke5-e4
2. Bc5-d4 and 3.Bg8-h7 mate
Ribannah
10-11-2004, 08:39
Akots,
In #11, it needs to be shown that 5.Kg3 does not make a draw. All the moves are in fact forced when you are familiar with the Q/R+p endgame. It's nice though.
In #15, isn't it Black who is to move? ;)
Thanks for the comments, Ribannah. #15 has been corrected. And in #11 5. Kg3 only "causes pain and suffering" (speaking Fritz language) for the white.
For example, 5. ... Qg1+. 6. Kf3 Kf5. 7. Ke2 Qc1 (White bishop has to move). 8. Bd4 b2. 9. Bxb2 Qxb2+. 10. Kf3 Qd2. And in this case black win pawn on f2 rather easily because of, for example, the following variation: 11. Kg3 Qd6+. 12. Kf3 Qd1+. 13. Kg3 Qg1+ 14. Kf3 Qg4 checkmate.
By no means these variations are forced and there might be more possibilities for the white as well as black for better moves, it is just a casual 5-minte view of the positon.
Ribannah
10-11-2004, 12:29
In the above line after 5.Kg3, white draws by (10...Qd2) 11.Kg2 (or 12 or 13) and Black cannot penetrate the fortress. The correct continuation for black is to play 5...Kf5 first. Oftentimes, the threat is stronger than the immediate execution of a plan, which in this case allows the white king to escape to e2.
After 5...Kf5 6.Rxb3 Qg1+ 7.Kh3 (7.Kf3? Qd1+) Kxe5 wins for Black.
So white plays 6.Bb2 Qg1+ 7.Kh3 (7.Kf3? Qg4 checkmate) Qxf2 8.Rxb3, after which 8...Qf1+ 9.Kh2 Qf4+ 10.Kg2 Qe4+! 11.Kg3 Qe1+ 12.Kh3 Kf4! or 12.Kg2 Kg4! is again a win for Black.
Socrates
10-11-2004, 13:33
Having a quick look at these solutions without having eaten in the day is a sure way to be depressed for the rest of the day. :D Those bonus puzzles are definitively not in my league.
@Ribannah: Yep, you are right here! That is one of the reasons I could not solve it myself!
@Krys: Number 11 is out of my league also. But it is pleasant just to look at the solution!
Position number 15. Start:
http://www.civ3duelzone.com/forum/uploaded/akots/200411107713_11-10-89-1.jpg
45.13 KB
Black to move and to win. Rapidly and deadly. Solution brings 2 points.
Please pm the answer to me no later than 6am GMT November 11.
This one is all forced:
1. ... Rc6-c1+!
2. Qd2xc1 Ra8xa3+! (if 2. Rd1xc1 white lose their Queen after Qg2xd2)
3. Ka1-b1 Ra3-a1+! (if 3. b2xa3 Qg2-a2 mate)
4. Kb1xa1 Qg2-a8+ and Qa8-a2 checkmate
Socrates
11-11-2004, 11:40
Once again I was so close... :( I'm sure that I sometimes come close to the solution, then don't see the way out, see the "way out" on another (false) solution, and then forget to come back to the real solution. I was tempted to do "rook takes a3", and I saw the queen move to a8 then a2, and I knew about the other rook to c1, and I saw the queen mate on a2, but I somehow failed to put all of this in order.
Rik Meleet
11-11-2004, 14:39
I too saw (most of) the moves. I didn't see Qg2-a8. I was also looking at Bg7xd4.
Position number 16. Start:
http://www.civ3duelzone.com/forum/uploaded/akots/2004111172348_11-11-87-1.jpg
43.85 KB
White to move and to give mate in a few moves. Solution brings 2 points.
Please pm the answer to me no later than 6am GMT November 12.
Only forced moves in this one. Both for white and black.
1. Qf7-f8+ Kh6-g5
2. Rf1xf5+! g6xf5
3. Qf8-g7 mate (main line, beautiful mate!)
If 2. ... Kg5-g4
3. Rf5-g5+! Kg4xg5
4. Qf8-f4 mate
Or 3. ... Kg4-h3
4. Qf8-c8+ and mate or also possible 4. Bb3-e6+ Qe2xe6. 5. Qf8-f1+ and mate
In case of 1. ... Kh6-h7 white win easily:
2. Bb3-g8+ Kh7-h8
3. Bg8-f7+ Kh8-h7
4. Qf8-g8+ and Qg8xg6 mate.
Amazingly, this is position from an actual game played in 1977. Not a grandmaster game but still leaves very strong impression!
Socrates
12-11-2004, 11:10
Could you describe precisely how you quickly mate after White doing Be6+ or Qc8+ and Black answering by Qg4 ? I have a problem then, because the white rook can't safely check on h5 (black pawn on g6), and if White loses initiative, then Black can check with his rook and the black king can escape his trap. I'm a bit puzzled.
In both variations black lose their Queen and mate comes rather rapidly, though indeed it takes a few extra moves.
Position number 17. Start:
http://www.civ3duelzone.com/forum/uploaded/akots/2004111253218_11-12-458k-1.jpg
49 KB
This is sort of a joke but very peculiar joke. Actually has little to do with chess. The task is to indicate how this position could have originated from the normal starting position of the chess game in 4 moves. Not in 3 moves but in 4 full moves (white and black). Solution brings 2 points. Note also that moves are "legal", not something extraordinary. But the moves don't have to make sense from a regular chess game point of view. Cooperative play.
Please pm the answer to me no later than 6am GMT November 13.
OK, here it is:
1. e2-e4 e7-e6
2. Bf1-b5 Ke8-e7
3. Bb5xd7 c7-c6
4. Bd7-e8 Ke7xe8
Four whole moves. Good way to entertain your guests when the food is not ready yet. Will keep them puzzled for a while. :)
Position number 18. Start
http://www.civ3duelzone.com/forum/uploaded/akots/200411136325_11-13-89-2p.jpg
42.44 KB
Black to move and to win. Rapidly and very deadly. Solution brings 2 points.
Please pm the answer to me no later than 6am GMT November 14.
Solution:
1. ... Rf2-f1+!
2. Bg2xf1 Qh4-e4+!
3. Qb1xe4 e2xf1 mate
Socrates
14-11-2004, 11:27
I don't know why I didn't see that this problem was to solve yesterday, not for Tuesday ??? [blush2]
quote:Originally posted by kryszcztov
I don't know why I didn't see that this problem was to solve yesterday, not for Tuesday ??? [blush2]
Hehe me too :)
I had the sollution written down, but i wanted to solve the bonus puzzle before I would submit this one.
Oh well... better luck next time!
Don't know guys, Rik have seen and you did not. [hmm]
Position number 20. Start
http://www.civ3duelzone.com/forum/uploaded/akots/2004111472322_11-15-223-1.jpg
45.41*KB
Black to move and to win. Rapidly and very deadly. Solution brings 1 point.
Please pm the answer to me no later than 6am GMT November 15.
Solution:
1. ... Qc3-e1 (threatening Qf2+)
2. Qd1xe1 Ne5-f3+
3. Kg1-h1 Rb2xh2 mate
Very nice mate here.
quote:Originally posted by akots
Solution:
1. ... Qc3-e1 (threatening Qf2+)
2. Qd1xe1 Ne5-f3+
3. Kg1-h1 Rb2xh2 mate
Very nice mate here.
But what if:
1. ......, Qc3-e1
2. Kg1-h1, Qe1-f2
3. Qd1-e2?
quote:Originally posted by Banzai
But what if:
1. ......, Qc3-e1
2. Kg1-h1, Qe1-f2
3. Qd1-e2?
Simply
3. ... Rxe2
quote:Originally posted by akots
quote:Originally posted by Banzai
But what if:
1. ......, Qc3-e1
2. Kg1-h1, Qe1-f2
3. Qd1-e2?
Simply
3. ... Rxe2
[blush2] Please forgive me.. it is still early! :)
4. Bf1xe2, Qf2xe2 and white can not prevent the knight from moving to F3.
It just takes a bit longer.
Position number 21. Start
http://www.civ3duelzone.com/forum/uploaded/akots/2004111564420_11-16-229-1.jpg
46.44 KB
White to move and to give mate in 5. Solution brings 1 point.
Please pm the answer to me no later than 6am GMT November 16.
IMHO, there is no shame to make mistakes in chess. In this classical game, black have helped to author one of the most beautiful combinations (at least to my taste). Certainly, their opening moves were wrong, but look how this all turned out!
1. Qd4-d7+! Be6xd7
2. Ne4-d6++ Ke8-d8
3. Nd6-f7+ Kd8-c8
4. Re1-e8+! Bd7xe8
4. Rd1-d8 checkmate!
Bonus weekend puzzle number 19:
http://www.civ3duelzone.com/forum/uploaded/akots/2004111361914_11-14-125k-6p.jpg
43.02*KB
White to start and to give mate in about 15 moves or sooner. Most moves in the end are forced though, so should be not so extremely difficult. Solution brings 6 points.
Please pm the answer to me no later than 6am GMT November 16.
This one is from the actual game (like most of the other puzzles) played in 1961.
As one can notice, black threatens the white king really badly. And there is no apparent and easy way out. For example, 1. Qg7-b7+ Rc2-c6 and white are doomed. However, it is not that simple.
1. Nb1-c3+!! Rc2xc3 If 1. ... b4xc3, white give checkmate right in the center of the board by playing 2. Qg7-b7+ Kd5-e5. 3. Qb7-e7+ Ke5-d5. 4. Rf6xd6 mate.
2. Qg7-g2+ Kd5-e5 Other move like 2. ... Rc3-f3 results in even more rapid mate by playing 3. Qg2-d2+ Kd5-c6. 4. Qd2xd6 and mate in 2 moves. 2. ... Qh5-f3 just sacrifices black queen and the whole game with it after 3. Rf7xf3 since black do not stand a chance in this ending.
3. Bb6-d4+! Ke5xd4
http://www.civ3duelzone.com/forum/uploaded/akots/2004111645818_11-14-a.jpg
41.99šKB
4. Qg2-d2+ Rc3-d3 4. ... Kd4-c5. 5. Qd2xd6+ Kc5-b5. 6. Qd6-b6 checkmate.
5. Qd2xb4+ Kd4-e5
6. Qb4-f4+ Ke5-d5
7. Qf4xd6+ Ke5-e4
8. Qd6-f4+ Ke4-d5
9. Qf4-c4+ Kd5-e5
10. Qc4-e6+ Kd5-d4
11. Rf6-f4+ Kd4-c3
http://www.civ3duelzone.com/forum/uploaded/akots/200411165446_11-14-b.jpg
41.43šKB
12. Qe6-e1+ Kc3-b2
13. Rf4-f2+ Kb2-a3
14. Qe1-e7+!
A very peculiar and unusual mate in an actual game! IIRC, black resigned a bit earlier.
This is how the actual game developed. However, Banzai, who solved this puzzle, suggested another solution, which I have carefully studied and found also correct! The black King goes to the other side of the board but alas, it does not help!
Instead of 4. Qd2-g2+ white can also win by playing:
4. Rf6xd6+! Kd4-e5
5. Qg2-d5+ Ke5-f4
6. Qd5-d4+ Kf4-g3
7. Qd4-f2+ Kg3-g4
8. Rd6-d4+ Kg4-g5
9. Qf2-f4+ Kg5-g6
10. Rd4-d6+ Kg6-h7
http://www.civ3duelzone.com/forum/uploaded/akots/2004111651241_11-14-c.jpg
41.75šKB
11. Qf4-e4+ Kh7-g7
12. Qe4-e7+ Qh5-f7
13. Qe7-g5+ Kg7-f8
14. Rd6-d8+ Qg7-e8
15. Qg5-f6+ Kf8-g8
16. Rd8xe8+ Kg8-h7
17. Re8xh8 checkmate!!!
http://www.civ3duelzone.com/forum/uploaded/akots/200411165152_11-14-d.jpg
40.86šKB
It should be noted (as also correctly indicated by Banzai!) that
4. .... Kd4-e3 is not an option since white give checkmate easily after:
5. Qg2-f2+ Ke3-e4
6. Rd6-d4+ Ke4-e5
7. Qf2-f4+ Ke5-e6
http://www.civ3duelzone.com/forum/uploaded/akots/2004111651849_11-14-e.jpg
41.75šKB
8. Rd4-d6+ Ke6-e7
9. Qf4-f6+ Ke7-e8
10. Rd6-d8 mate!!
Position number 22. Start
http://www.civ3duelzone.com/forum/uploaded/akots/2004111654629_11-17-190-1.jpg
45.86 KB
White to start and to win. There are a few possibilities but I'm sure it is possible to find the swiftest and most beautiful solution rather easily. Solution brings 1 point.
Please pm the answer to me no later than 6am GMT November 17.
A bit tricky with the second move. The position is from the actual training game played between Fisher and Fain in 1963. Of course Fisher was white.
1. Rf1-e1+ Ke8-d8 (Bxe1 does not change anything)
2. Qb3-g3! (and Fain resigned because 2. ... Qxg3 is countered by 3. Bf6! checkmate. Other moves by the black Queen result either in her loss or in loss of control over f6 square.)
Rik has actually indicated another alrenative winning variation, not so effective in terms of impression but still very deadly:
1. Rf1-e1+ Ke8-d8
2. Qb3-b2 and black cannot defend normally because after 2. ... Rxg7. 3. Qxg7 white queen really threatens all over the place. Major Kudos to Rik for that one!
Rik Meleet
17-11-2004, 09:03
quote:Originally posted by akots
(..)Rik has actually indicated another alrenative winning variation, not so effective in terms of impression but still very deadly:
1. Rf1-e1+ Ke8-d8
2. Qb3-b2 and black cannot defend normally because after 2. ... Rxg7. 3. Qxg7 white queen really threatens all over the place. Major Kudos to Rik for that one!
So I thread on new grounds ?? Cool !! [python]
The major thread I saw was Bg7-f6.
It would be fun if Kryz and Banzai (and others) comment on my moves in this game. I'd like to know if it is really winable or that I overlooked something.
Socrates
17-11-2004, 13:20
Rik's move to b2 looks good enough. :) I can't think of any move for Black to save both mate and queen.
As for the move to g3, I think I got it via some instinct, maybe I saw it when I was young ? [hmm] There are surely some problems I have seen someday...
Nice move Rik! It looks perfect to me!
Position number 23. Start
http://www.civ3duelzone.com/forum/uploaded/akots/2004111774142_11-18-197-2.jpg
Black are to move and win almost instantly by a brilliant combination. Solution brings 2 points.
Please pm the answer to me no later than 6am GMT November 18.
This is the fragment of actual game (1957). Famous grandmaster Rossolimo played the black. He was extremely talented in finding non-standard moves and combinations. This one follows the spirit of the great player.
1. ... Rd4-d1!!
The move looks spectacular. If rook b1 leave the post, the white queen on b2 is undefended and captured. Also black threaten Qxf1+. The move activates the bishop on a7 as well. White cannot defend from multiple threats.
There are a few winning variations but the best defence for the white might be this one:
2. Bd5xb7+ Ka8-b8
3. c2-c4 Ba7xf2+
4. Qb2xf2 Rf8xf2
5. Rf1xd1 Rf2-b2 and black easily win.
Instead of 3. c2-c4 it was possible to play 3. Qb2xb5 which is countered by Ba7xf2+. 4. Kg1-h2 Rf8-h8+ and black win.
Ribannah
18-11-2004, 09:26
quote:Originally posted by akots
1. ... Rd4-d1!!
There are a few winning variations but the best defence for the white might be this one:
2. Bd5xb7+ Ka8-b8
3. c2-c4 Ba7xf2+
4. Qb2xf2 Rf8xf2
5. Rf1xd1 Rf2-b2 and black easily win.
Ahem, not quite.
Instead, black plays 3...Rxf2 (the point of the combination) and the mate threat decides at once (4.Qxb5 Rfxf1++ 5.Kh2 Rh1 checkmate).
Well, on 3. ... Rxf2 white can play Qxf2 with the similar result.
The actual game had the following moves in it:
1. ... Rd1. 2. Bxb7+ Kb8. 3. c4 Bxf2+. 4. Kh2 Rh8 mate.
Ribannah
18-11-2004, 18:15
After 3...Rxf2 4.Qxf2 Bxf2 (4...Qxb1 wins also because Qf2 is pinned)is check, so White has no time for 5.Rxfd1.
In the game (apparently) 3...Bxf2+?? 4.Qxf2! Rxf2 5.Rfxd1 Rb2?? (5...Qc5 should draw) 6.cxb5 White stays a rook up.
Edit: Ah, your source is wrong. See:
http://zds.org.il/Chess%20Games/Archive001/game0075.shtml
Black played 3...Rxf2 as I indicated, and White allowed the mate.
You are certainly right about Rb2. I gues I was thinking that black queen is on c5 instead of b5. Still after Bxf2 5. ... Qc5 allows black to keep certain advantage but not sure about that. Regarding the actual game, it has been controversial. Since the other partner is NN, the only proof of what happened in it is Rossolimo's word. So, I guess somewhere he told he played Bxf2 and somewhere he told he played Rxf2. These things happen rather often with NN games. This particular grandmaster was know to be a bs-tter, at least according to a few Russian authors. I have another good Russian book also confirming that Bxf2 was played.
Ribannah
18-11-2004, 20:04
That doesn't say a thing, Akots. If one person makes a mistake, a thousand copy it without thinking. Also even if this is from a book explicitly mentioning Rossolimo as the author, chances are high that he didn't write it.
A grandmaster does not play a move like 1...Rd1 only to forget its point.
Sure, people copy mistakes and typos from each other. It is quite possible. IIRC, Rossolimo was Russian/Ukranian immigrant to France and USA but I'm not aware of any books he has written at least not in Russian.
I also found a cool link with discussion of Rossolimo's biography details. For example, he was unable to make enough money wich chess lessons and was driving cab in NY for a living. And the end is very sad as well. He was drunk (as usual) and fell off the steep stairs breaking the neck.
http://www.chessgames.com/perl/chessgame?gid=1269193
Just a note. I'm not explicitly trying to run the contest error-proof. This will take a long-long time. Though I do always proof-check the puzzles but my playing skill is rather limited and the puzzles are sometimes more complicated than it seems at a first glance. I could have used some chess program to run the proofreading but I have only limited Fritz 6 (with some features disabled) which is rather stupid sometimes and is used only to create diagrams since I don't trust it. And it is amazing how many errors are in even very good books including one edited, for example, by Karpov.
Therefore all corrections of mistakes are highly appreciated by everyone and especially by such a skilled player as Ribannah. [goodjob]
Position number 24. Start
http://www.civ3duelzone.com/forum/uploaded/akots/2004111873457_11-19-200-2.jpg
43.55 KB
White are to move and win by a very "accurate" combination. there are two main variations. Solution of both brings 2 points. Solution of only one brings 1 point.
Please pm the answer to me no later than 6am GMT November 19.
1. Nf3xg5+!
A)
1. ... h6xg5
2. Bg2-e4+ Kh7-h6
3. Rf8-h8+! Bg7xh8
4. Rc7-h7 checkmate
B)
1. ... Kh7-g6
2. Bg2-e4+
B1)
2. ... Kg6-h5
3. Rc7xg7 Qb6-d4 (there are other variations, Rik has found them all!)
4. Kh1-g2! or Rf8-f4 +/-
B2)
2. ... Kg6xg5
3. Rc7xg7+ Kg5-h5
4. Be4-f3+ +/-
These are additional variations which Rik has found. I really did not have enouhg time to check them all.
1: Nf3xg5+ - Kh7-g6
2: Bg2-e4+ - Kg6-h5
3: Rc7xg7 - Qb6-a6 (threatens Qf1 mate)
4: Be4-f3+ - Be6-g4
5: Bf3xg4+ - Kh5xg4
6: Ng5-e6+ - Kg4-h5 (or Kg4-h3)
7: Ne6-f4 mate.
In move 3: black queen can also move to b5 or c5 (same result), f2 (taken by white).
3: ... Qb6-d4 (or Qd6-b4)(now 4: Be4-f3+ - leads to Be6-g4 5: Bf3xg4 - Qd4xg4 and black has the upper hand)
4: Be4-g6+ - Kh5-g4 (Kh5xg4? - Bg6-e8 mate)
5: Rf8-f4+ - Qd4xf4 (Kg4xg5? - 6:Bg6-e8 mate)
6: Bg6-h5+ - whatever
7: g3xf4 and white should win easily.
3: ... Qb6-e3
4: Be4-f3+ - Be6-g4
5: Bf3xg4+ - Kh5xg4
6: Ng5-e6+ - Kg4-h3 (or Kg4-h5 - 7: Rf8-f4+ (and black looses the queen))
7: Ne6-f4+ - Qe3xf4
8: Rf8xf4 - black moves a pawn,
9: Rf4-h4 mate
phew...
Ribannah
19-11-2004, 14:04
Easiest after 1...Kg6 is 2.Rxg7+ Kxg7 3.Nxe6+ Kg6 4. Be4+ Kh5 5. Nf4+ Kg5 6.h4+ Kg4 7.Rg8 checkmate.
But pretty much everything wins after 1...Kg6, as White gains a decisive material advantage. (And ...Qa6 does not threaten mate.)
Position number 25. Start
http://www.civ3duelzone.com/forum/uploaded/akots/2004111984632_11-20-82-2.jpg
44.65 KB
White are to move and win. Solution brings 2 points.
Please pm the answer to me no later than 6am GMT November 20.
1. Rf3-a3! b4xa3
2. Bd7! Qa4xd7
3. Rh1xh7+ Kh8xh7
4. Qd1-h5 checkmate.
2. Bh3xc8 is not enough to score the points because after 2. ... Rg8xc8. 3. Rh1xh7+ Kh8xh7. 4. Qd1-h5+ Kh7-g8. 5. Qh5-g4+ Kg8-f8. 6. Qg4xc8 Qa4-e8 black still survive. Also not the winning move is 2. Qd1-h5 Bc8xh3. 3. Qh5xh3 a3-a2+. 4. Kb1-a1 Qa4xc2 and black managed to defend pawn on h7.
Ribannah
20-11-2004, 12:21
In the line with 2.Bxc8, on 6...Qe8 7.Qh3 forces an immediate mate.
However, black plays 2...Rg6 (instead of 2...Rxc8??).
After 2.Bd7 Black also plays 2...Rg6 and is still around after 3.Bxa4 Bg4.
This is not draughts, one is not forced to capture anything!
You are right. I should have seen 7. Qh3! but did not check the variation since it is taken from a Karpov-edited book. Guess the honorable grandmaster has done a lousy job that time. :)
It would be nice to run a check on all positions but they are taken from the actual games. Alas, this is barely possible since they are often more complicated than simple puzzles of move-in-2-3-4 type. I finally got an hour to spare and checking number 24 now.
quote:Originally posted by Ribannah
Easiest after 1...Kg6 is 2.Rxg7+ Kxg7 3.Nxe6+ Kg6 4. Be4+ Kh5 5. Nf4+ Kg5 6.h4+ Kg4 7.Rg8 checkmate. ...
Ahem as well. Instead of 3. ... Kg6 black just play 3. ... Qxe6. And in Rik's variation Qa6 indeed threatens mate since the bishop has moved from g2.
These are additional variations which Rik has found for number 24. I really did not have enouhg time to check them all, so checking now.
1: Nf3xg5+ - Kh7-g6
2: Bg2-e4+ - Kg6-h5
3: Rc7xg7 - Qb6-a6 (threatens Qf1 mate)
4: Be4-f3+ - Be6-g4
5: Bf3xg4+ - Kh5xg4
6: Ng5-e6+ - Kg4-h5 (or Kg4-h3)
7: Ne6-f4 mate. This one is correct
In move 3: black queen can also move to b5 or c5 (same result), f2 (taken by white).
3: ... Qb6-d4 (or Qd6-b4)(now 4: Be4-f3+ - leads to Be6-g4 5: Bf3xg4 - Qd4xg4 and black has the upper hand)
4: Be4-g6+ - Kh5-g4 (Kh5xg4? - Bg6-e8 mate) If 4. ... Kxg5. 5. Be8+ Then no mate since black play Qxg7. Instead white play 5. h4+ Kg4. 6. Rf4+ and win decisive advantage.
5: Rf8-f4+ - Qd4xf4 (Kg4xg5? - 6:Bg6-e8 mate) A bit stronger is 5. Nxe6 but result is similar
6: Bg6-h5+ - whatever
7: g3xf4 and white should win easily.
3: ... Qb6-e3
4: Be4-f3+ - Be6-g4
5: Bf3xg4+ - Kh5xg4
6: Ng5-e6+ - Kg4-h3 (or Kg4-h5 - 7: Rf8-f4+ (and black looses the queen))
7: Ne6-f4+ - Qe3xf4
8: Rf8xf4 - black moves a pawn,
9: Rf4-h4 mate This is correct.
IMO, overall Rik did great with this one!
Ribannah
20-11-2004, 20:52
quote:Originally posted by akots
quote:Originally posted by Ribannah
Easiest after 1...Kg6 is 2.Rxg7+ Kxg7 3.Nxe6+ Kg6 4. Be4+ Kh5 5. Nf4+ Kg5 6.h4+ Kg4 7.Rg8 checkmate. ...
Ahem as well. Instead of 3. ... Kg6 black just play 3. ... Qxe6. And in Rik's variation Qa6 indeed threatens mate since the bishop has moved from g2.
[blush2][aargh]
In the line with ...Qa6, however, I have a white rook on f8.
One consolation to us: this type of error (the blatant ones) is the most common type made by analysts, even at the highest level. :)
quote:1: Nf3xg5+ - Kh7-g6
2: Bg2-e4+ - Kg6-h5
3: Rc7xg7 - Qb6-a6 (threatens Qf1 mate)4...Qf1+ 5.Rxf1
One further correction:
quote:3: ... Qb6-d4 (now 4: Be4-f3+ - leads to Be6-g4 5: Bf3xg4 - Qd4xg4 and black has the upper hand)
6.Nh7 (easiest) Qxg7 7.Nf6+ Kg6 7.Rg8 and White wins.
I don't mind errors at all as long as we have enough qualification to be able to correct them and ultimately find the truth. So far, it has been working. :)
Position number 26. Start
http://www.civ3duelzone.com/forum/uploaded/akots/2004112053046_11-21-85-4.jpg
44.65 KB
White are to move and win. Solution brings 3 points.
Please pm the answer to me no later than 6am GMT November 22.
Well, first moves are obvious:
1. g2-g4+ Kh5-h4
Then a bit not obvious:
2. Bd2-h6! threatening Qa2-h2 mate. The only defence is 2. ... Qg7xh6 otherwise, black loses the queen
3. Qa2-h2+ Kh4-g5
4. Qh2-d2+ Nd3-f4 (otherwise, Queen on h6 is lost). And finally:
5. Qd2-d8 checkmate!
Socrates
22-11-2004, 10:36
Yeah, Bh6 was exactly the move I couldn't find, though I now regard it as a sequel : there have already been many problems here involving a pseudo-sacrifice (here : Bh6) that in fact enables another piece to enter the scene (here : Qh2+, which I was sure was the right move) while threatening another strong piece (here : the black queen). I'll try to search for such moves now. [groucho]
Position number 28. Start
http://www.civ3duelzone.com/forum/uploaded/akots/2004112243856_11-23-39-1.jpg
44.82šKB
Black are to move and win. Solution brings 1 points.
Please pm the answer to me no later than 6am GMT November 23.
1. ... Qg6-g3
2. Qd3xd5+ Rh5xd5
3. f2xg3 (3.Rxg3 Rxd1+)
3. ... Rh6xh2+
4. Kh1xh2 Rd5-h5 checkmate.
Position number 29. Start
http://www.civ3duelzone.com/forum/uploaded/akots/200411235633_11-24-88-1.jpg
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Black are to move and to win. Obviously their main problem is getting their queen to d1. Solution brings 1 point.
Please pm the answer to me no later than 6am GMT November 24.
1. ... Bf2-e3+!
2. Bf4xe3 Ne4-f2! (threatening Qd1 mate)
3. Be3xf2 Qd5-d2+
4. Kc1-b1 Qd2-d1+
5. Kb1-a2 Qd1xc2 mate.
Position number 27 - Bonus. Start
http://www.civ3duelzone.com/forum/uploaded/akots/2004112053148_11-21-99-10.jpg
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White are to move and win. Solution brings 10 points. This one is not extremely tricky if given a clear thought with a clear head. At least I was able to solve it though it took some time. It is rather famous so please, if somebody knows the solution, keep it to yourself.
Please pm the answer to me no later than 6am GMT November 24.
1. Qg1-g5! threatening d7-d8Q.
Black cannot play 1. ... Bc6xd7 since after 2. Nd3-f4 white threatens Be2-h5+ with deadly attack. For example: 2. ... Qf8-d6. 3. Be2-c4+ Kf7-e8. 4. Qg5-g8+ Ke8-e7. 5. Nf4-d5+ and black loses the Queen.
So, the only way out is:
1. ... Kf7-e6+
2. Kf2-g1! The only way to safely escape the checks by the black queen.
2. ... Ke6xd7
If 2. ... Bc6xd7, then black loses after 3. Be2-g4+ Ke6-f7. (Ke6-d6. 4. Qg5-c5 mate) 4. Nd3-e5+ Kf7-e8. 5. Bg4xd7 checkmate. See the diagram:
http://www.civ3duelzone.com/forum/uploaded/akots/2004112341654_11-21a.jpg
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Continuation of the main variation:
3. Nd3-c5+
http://www.civ3duelzone.com/forum/uploaded/akots/2004112341846_11-21b.jpg
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Here black has a few possibilities.
A)
3. ... Kd7-d6 loses queen in all variations. For example:
4. Qg5-g3+! Kd6-d5
(4. ... Kd6xc5 5. Qg3-a3+ +/-)
(Or 4. ... Kd6-e7. 5. Qg3-e5+ Ke7-f7. 6. Be2-c4+ Kf7-g6. 7. Bc4-d3+ - see diagram below. White have winning advantage.
http://www.civ3duelzone.com/forum/uploaded/akots/2004112342424_11-21c.jpg
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For example: 7. ... Kg6-f7. 8. Qe5-e6+ Kf7-g7. 9. Qe6-g6+ Kg7-h8. 9. Qg6-h7 mate. Or 7. ... Kg6-h6. 8. Qe5-h2+ winning the black queen. Overall seems that 4. ... Kd6-d5 gives the best chance for the black.
5. Be2-c4+! Kd5xc4
6. Qg3-b3+ Kc4xc5.
7. Qb3-a3+ Kc5-b6
8. Qa3xf8 winning the queen (original solution by author). However, this branch a bit controversial since white can hardly win because black can try to create a fortress with knight and bishop fighting off the white queen. Apparently as strong as 5. Bc4+ may be:
5. Qg3-d3+ with very strong attack. We can continue analysis from here but looks like white are going to win since their king can hide. However, I have not looked to the end into this one. May be somebody else can find the ultimate solution.
B)
3. ... Kd7-c8
4. Be2-a6+ Kc8-b8
5. Qg5-g3+ Kb8-a8
http://www.civ3duelzone.com/forum/uploaded/akots/2004112344420_11-21d.jpg
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6. Ba6-b7+! Bc6xb7
7. Nc5-d7!!
Incredible position indeed! Looks like magic not chess!
http://www.civ3duelzone.com/forum/uploaded/akots/2004112344655_11-21e.jpg
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White threaten Nb6 mate and black queen on f8. Black queen cannot leave the 8th row because of white giving mate with thier queen on b8. The only reasonable move is
7. ... Qf8-d8 defending b6 and b8 and moving the queen. But then white win:
8. Qg3-b8+ Qd8xb8
9. Kd7-b6 checkmate!
http://www.civ3duelzone.com/forum/uploaded/akots/2004112345050_11-21f.jpg
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Ribannah
24-11-2004, 09:52
quote:Originally posted by akots
5. Be2-c4+! Kd5xc4
6. Qg3-b3+ Kc4xc5.
7. Qb3-a3+ Kc5-b6
8. Qa3xf8 winning the queen (original solution by author). However, this branch a bit controversial since white can hardly win because black can try to create a fortress with knight and bishop fighting off the white queen.Black will seek the position with K in the corner, Bb7 and Nd5. Only a database can say for certain, but it seems doubtful as White will play Qb8. So, this variation may well be correct.
quote:Apparently as strong as 5. Bc4+ may be: 5. Qg3-d3+ with very strong attack. We can continue analysis from here but looks like white are going to win since their king can hide. However, I have not looked to the end into this one. May be somebody else can find the ultimate solution.5.Qd3+ Ke5 6.Qe3+ Kd6! and White makes no progress.
Position number 30. Start
http://www.civ3duelzone.com/forum/uploaded/akots/2004112443047_11-25-116-2.jpg
44.58 KB
Black are to move and to win. Solution brings 2 points.
Please pm the answer to me no later than 6am GMT November 25.
1. ... g6-g5 (Threatening 2. ... Rh4+. 3. gh4 g4+. 4. Kg3 Ne2 mate)
2. Rf1-e1 Rg4-f4
3. g3xf4 g5-g4+
4. Kh3-g3 Nd4-f5 mate
Rik Meleet
25-11-2004, 12:25
What about:
1: ... Rg4-e4
2: Rf1-e1 - g6-g5
3: Re1xe4 - g5-g4+
4: Re4xg4 - h5xg4 mate ???
quote:Originally posted by Rik Meleet
What about:
1: ... Rg4-e4
2: Rf1-e1 - g6-g5
3: Re1xe4 - g5-g4+
4: Re4xg4 - h5xg4 mate ???
2: d3xe4!
Rik Meleet
25-11-2004, 17:27
2: d3xe4 doesn't stop g6-g5 and g5-g4 mate.
And 2: d3xe4 followed by 3: g3-g4 doesn't stop the h5-h4 move and white cannot efficiently protect f4 against a mate with the knight or a promotion of the f-pawn on e1, after which the c-pawn really promotes ... !!!
quote:Originally posted by Rik Meleet
2: d3xe4 doesn't stop g6-g5 and g5-g4 mate.
Why not? Knight cannot jum to f5 or e2 after Re1 and hence cannot get to f4. And white have an option to sacrfice rook for pawn f3 if they wish. Dunno abour the c pawn, have to analyze more... since I assume it was a joke. :)
But seriously, if you can show the winning for black variation after 1. ... Re4 with decent play for white, you will get 2 points.
After .... Re4?
dxe4 g5
white can play g4 preventing the mate - it defends f5. The king will escape.
Rik Meleet
25-11-2004, 20:29
OK. I give up. I've analysed for hours and deep into the 30+ moves, but no win after Re4 ....
Position number 31. Start
http://www.civ3duelzone.com/forum/uploaded/akots/200411256125_11-26-132-1.jpg
42.08 KB
White are to move and to win. Solution brings 1 point.
Please pm the answer to me no later than 6am GMT November 26.
1. Rf7-f4+ Kg4-h4
2. Rf4-h4+ g5xh4
3. g3-g4 checkmate.
Position number 32. Start
http://www.civ3duelzone.com/forum/uploaded/akots/2004112731625_11-27-217-1.jpg
42.08 KB
Black are to move and to win. Solution brings 1 point.
Please pm the answer to me no later than 6am GMT November 28.
1. ... Re3xh3+!
2. g2xh3 Qb2-h2+!
3. Kh1xh2 Rf4-f2++
4. Kh2-h1 Rf2-h2 checkmate
Short and gory.
Position number 33 - Bonus. Start
http://www.civ3duelzone.com/forum/uploaded/akots/2004112735158_12-01-k281-8p.jpg
40.31 KB
White to start and to win. Solution brings 8 points.
Please pm the answer to me no later than 6am GMT December 1.
This one was composed by Korol'kov (famous Russian composer) in 1951.
It is not that difficult except for a few moves...
1. f6-f7 Rg6-a6+
2. Bc1-a3! Ra6xa3+
3. Ka1-b2 Ra3-a2+!
http://www.civ3duelzone.com/forum/uploaded/akots/20041219366_12-01-k281-a.jpg
38.16KB
4. Kb2-c1! (If 4. Kb2-c3 Ra2-c2+. 5. Kc3-b4 Rc2-b2+ and white cannot win)
4. ... Ra2-a1+
5. Kc1-d2 Ra1-a2+
6. Kd2-e3 Ra2-a3+
7. Ke3-f4 Ra3-a4+
8. Kf4-g5 Ra4-g4+
http://www.civ3duelzone.com/forum/uploaded/akots/200412193950_12-01-k281-b.jpg
38.14KB
9. Kg5-h6! (If 9. Kg5xg4 Bc8xf5+. 10. Kg4xf5 Kh8-g7 making draw.)
9. ... Rg4-g8
10. Nf5-e7 Bc8-e6
11. f7xg8Q+ Be6xg8
12. Ne7-g6 checkmate!
http://www.civ3duelzone.com/forum/uploaded/akots/200412194357_12-01-k281-c.jpg
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This is author's solution.
Position number 34 - Bonus. Start
http://www.civ3duelzone.com/forum/uploaded/akots/2004112735644_12-01-k278-6p.jpg
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White to start and to make draw. Solution brings 8 points.
Please pm the answer to me no later than 6am GMT December 1.
Another bonus puzzle composed by Kasparyan in 1947. It is spectacular but not so difficult as well. Solution is rather forced but requires some knowledge of rook-versus-knight endings.
1. Kd5-e3! Rh3-h2! (What else?)
2. Kf4-g4 h4-h3
3. Kg4-g3 Rh2-b2!
http://www.civ3duelzone.com/forum/uploaded/akots/200412194926_12-01-k278-a.jpg
37.71šKB
4. Ne3-g4 (If 4. Ne3-f1? Rb2-b1. 5. Nf1-h2 Rb1-b3+ and black wins.)
4. ... Rb2-b3+
5. Kg3-h2 Kb8-c7! (Best chance for black. King rushes to battlefield, get there but a bit too late)
http://www.civ3duelzone.com/forum/uploaded/akots/20041219527_12-01-k278-b.jpg
37.67šKB
6. Ng4-f2! (If white tries to capture the pawn by 6. Ng4-e5 Kc7-d6. 7. Ne5-f7+ Kd6-e6. 8. Nf7-g5+ Ke6-f5. 9. Ng5xh3 Kf5-g4. 10. Nh3-f2+ Kg4-f3. 11. Nf2-h3 Rb3-b2+ black wins after 12. ... Kf3-g3)
6. ... Rb3-b2
7. Kh2-g1 h3-h2+
8. Kg1-h2 Rb2xf2 - Stalemate!!
http://www.civ3duelzone.com/forum/uploaded/akots/200412195724_12-01-k278-c.jpg
37.17šKB
Ribannah
02-12-2004, 10:50
Akots,
What does White play after:
(a) 1.Ne3 Kc7
(b) 1.Ne3 Rh1
(You should explain the 'what else'. :))
I guess both variations (Kc7 and Rh1) essentially come to the same point as the original solution. For example: 1. ... Rh1. 2. Kg4 h3. 3. Kg3 Rb1. 4. Ng4 Rb3+. 5. Kh2 Kc7. Similar variations for 1. ... Kc7. Was looking on this one for some time but was unable to find stronger play for the black. Some bigger concern is the end game in case if black does not take the knight but continue to advance with their king (8. ... Kd6 instead of 8. ... Rxf2 in the main variation). But appears that is comes to some positions which are know as draw. In general, king+rook very seldom win against king+knight only if king is really separated from the knight or both are very badly cornered. However, in this particular situation, if white can capture the pawn is it apparently draw. Though not sure, may be I'm missing something.
Ribannah
05-12-2004, 10:52
quote:Originally posted by akots
I guess both variations (Kc7 and Rh1) essentially come to the same point as the original solution. For example: 1. ... Rh1. 2. Kg4 h3. 3. Kg3 Rb1. 4. Ng4 Rb3+. 5. Kh2 Kc7. Similar variations for 1. ... Kc7. Was looking on this one for some time but was unable to find stronger play for the black.
The crucial line is 3...h2 4.Ng2! Kc7 5. Nh4 Kd6 6. Nf3.
quote:Some bigger concern is the end game in case if black does not take the knight but continue to advance with their king (8. ... Kd6 instead of 8. ... Rxf2 in the main variation). But appears that is comes to some positions which are know as draw.
No risk here, with the Knight on h2/f1 it's an easy draw. The problems occur when the knight is on g2, but in the variation with 3...h2 above the black king is too far off.
3. ... h2? is an easy draw for white.
Contest 2 position 1.
http://www.civ3duelzone.com/forum/uploaded/akots/20041245610_c2p1-117-1p.jpg
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Position 1. White to start and give mate in 3. Solution brings 1 point.
This one is easy catch.
1. Bh8-f6 g7xf6
2. Ke7-f8 f6-f5
3. Nh6-f7 mate.
Contest 2 position 2.
http://www.civ3duelzone.com/forum/uploaded/akots/20041245658_c2p1-182-4p.jpg
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Position 2. In this position black had the first move and they played 1. ... Qb6xb2. Question: is this a safe move or a bad losing move? Solution brings 4 points.
Proved to be rather difficult.
The answer is that 1. ... Qb6xb2 is an OK move, may be not the strongest one but not losing either at least immediately.
Why? here are few variations:
a)
2. Re1xe5 Rd5xe5
3. Qf3xf6 Qb2-b1+ with immediate draw
b)
2. Qf3-f6 Qb2xc3? (for example. Bad move thinking of 3. Rxe5 Qxe5.)
3. Qf6xg7+! Be5xg7
4. Re1-e8+ +/-
However, in this variation black can offer counter-sacrifice of the queen!
2. Qf3-f6 Qb2-c1!
3. Qf6xe5 Qc1xh6 and black is in no danger in this case.
There are certainly a few other variations but with the same result. Black always are able to defend from immediate threats.
Contest 2 position 3.
http://www.civ3duelzone.com/forum/uploaded/akots/20041245913_c2p1-211k-6p.jpg
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Position 3. White to start and somehow make a draw. Solution brings 6 points.
It is a bit tricky, especially with the first move. So, how white can make draw? Obviously, they need to capture the b pawn. How black can win then? Defend the b pawn with their bishop from c8. This is the only place where the pawn can be defended safely with the bishop. If white chose to get closer to a7 or b8 black can easily win. For example: 1. Kd6 Bf5. 2. Kc5 Bc8. 3. Kb6 Ke4. 4. Ka7 b5 -/+
Hence, if white can make the pawn move from b7... Hence, the first move, which seems rather strange. Since instead of stopping the pawn white is pushing the pawn to move! But it is the only way.
1. Kd7-c8!! b7-b5
2. Kc8-d7! b5-b4
3. Kd7-d6! Bh7-f5
4. Kd6-e5! Bf5-c8
5. Ke5-d4 and white catches the pawn, takes it and makes draw.
A spectacular position indeed!
Socrates
12-12-2004, 15:20
[cry] I had solved Problem 1 during the week, but waited to try the other ones before submitting to akots, and I thought we had another day ! [cry] Me stupid. Anyway with the short month we're in, there's not much to do, I will never catch up. [cry]
Well, apparently it is a good idea to send them one by one.
Rik Meleet
13-12-2004, 07:48
It was too hard for me this time...
I'm still having problems with uploading apparently due to some buggy stuff going on over my DSL connection, so no new diagrams.
The theme of these series is knights. One knight is a great power. Two knights are devastating. In these positions, look for the damage which can be done with two knights.
http://www.civ3duelzone.com/forum/uploaded/akots/2004121165850_c2p2-282-1p.jpg
Contest 2 position 4. Black to start and win (mate in 3). Solution brings 1 point.
1. ... Nh5-g3+
2. Kh1-g1 Qh3-g2+
3. Rf2xg2 Kf4-h3 mate!
http://www.civ3duelzone.com/forum/uploaded/akots/2004121171320_c2p2-294-2p.jpg
38.2šKB
Contest 2 position 5. White to start and give mate in 4 moves. Solution brings 2 points.
1. Rc8-a8+ Ka6-b6
2. Ra8-a8+ Kb6xa6
3. c8N! (promotes to Knight) black N any move
4. Ne6-c5 mate
http://www.civ3duelzone.com/forum/uploaded/akots/200412117350_c2p2-293-3p.jpg
43.8šKB
Contest 2 position 6. Does not look too bad for the black. However it is indeed. White to start and win rapidly and deadly. Solution brings 3 points.
1. Re1xe5! Qe8xe5
2. Nf4-g6! Qe5xd5 (2. ... Qe5xh2. 3. Nd5-e7! mate; 2. ... h7xg6 loses queen)
3. Kg6-e7+ Kg8-h8
4. Qh2xh7+ Kh8xh7
5. Rc1-h1+ and white wins
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