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| Jan-04-09 | | Antonius Blok: OK! I saw it! but I stopped on this:
24.Qxe4 Rxc4 25.Bc3 Bf5 26.Qe3(is it a wrong move) Coz after 26...Bxd4 27. Bxd4 Qxd5+ 28.Kg1 Rxd4 I didn't found nithing promising !!! Is there a refutation to 26.Qe3 instead of 26.Qf3 ?
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| Jan-04-09 | | stukkenjager: <antonius blok>: Is there a refutation to 26.Qe3 ? try this 26... Rxd4 27.Bxd4 Qxd5+ 28.Rf3 Bxd4 29.Qe2 Be4 works for me. |
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| Jan-04-09 | | RandomVisitor: After 23...Re4, deeper analysis run:
click for larger view [-2.20] d=22 24.Nc6 Qe8 25.Rae1 Bf5 26.Nxa7 Rxe1 27.Rxe1 Qxe1 28.Bxe1 Bxd3 29.Nxc8 Bxc4 30.Nb6 Bb3 31.Bc3 Bf8 32.Bb4 Bxb4 33.axb4 Kf8 34.Kg2 Ke7 35.Kf3 Nf8 36.Ke4 Kd8 37.d6 Nd7 38.Na8 Nb8 39.b5 (8:27.30) 2149216kN [-2.24] d=21 24.Bc3 Rxd4 25.Bxd4 Bf5 26.Qe2 Bxd4 27.Rae1 Bh3 28.Qd3 Bxf1 29.Rxf1 Qb6 30.b4 Qc7 31.Bb5 Qc3 32.Rd1 Be3 33.f5 (6:18.01) 1496595kN |
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| Jan-04-09 | | Marco77: the hardest week so far, I think they have exaggerated |
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| Jan-04-09 | | znprdx: Certainly one of the most profound illustrations of inspired combinational play...I can't recall seeing this beauty and depth from our top players.... but I guess this gem is flawed by the fact his opponent is a full class lower Even seeing the moves as played - I didn't immediately grasp the point - which I more often than not do. This is amazing magic ...26.Nxg5 WOW I missed his history completely - what happened - a 62.6% and yet a falling rating? Could this mean he actually plays Chess to win?! Like Tal and Fischer? |
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| Jan-04-09 | | agb2002: Black is a pawn down and his knight is poorly placed but White has a number of weaknesses: the squares around the castle, the diagonal a8-h1, the LSB and the knight are hanging and the DSB is obstructing the 'd' column. A way of pressing the weak points is 23... Re4: A) 24.Qxe4 Rxc4
A.1) 25.Be3 Bf5 26.Qf3 Bxd4 and Black has B+N vs R+P. A.2) 25.Bc3 Bf5 26.Qe3 Qxd5+ 27.Rf3 Bxd4 and B+N vs R. A.3) 25.Nc(e)6 Bxc(e)6 26.Qd3 (26.Qxc4 Bxd5+ winning the queen) Bxd5+ with decisive advantage. B) 24.Be3 Rxe3 25.Qxe3 Rxc4 and 2B vs R+P.
C) 24.Bc3 Rxd4 25.Bxd4 Bf5 26.Qc3 Be4+ 27.Kb1 Bxd5
C.1) 28.Bxg7 Rxc4 29.Qe5 Re4 30.Qc3 Qb6+ 31.Rf2 Rxf4 32.Qd2 (32.Raf1 Rg4+ winning) Qxf2+ 33.Qxf2 Rxf2 34.Kxf2 Kxg7 with B+N+P vs R. C.2) 28.b3 Bxc4 29.Bxg7 Bxf1 30.Qe5 Bh3 31.Bh8 Qb6+ 32.Qd4 (32.Kh1 Qc6+) Qxd4+ with a knight ahead. Time to post and check.
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| Jan-04-09 | | johnlspouge: < <dzechiel: [snip] Looking for candidate moves, the one that jumps out first is 23...Rxc4 > Hi, <dzechiel>. I spent more time today than I care to admit. To have found 23...Re4 without exploring 23...Rxc4 would have been difficult, and I wish 23...Rxc4 had been first on my candidates list, to save me time rejecting candidates. My process was: (1) I found 23...Rxc4 does not work; and then (2) I noticed that after 24...Rxc4, 23...Re4 was symmetric with 23...Rxc4, except that Bd7-f5 then embarrasses Qe4 more than if the Q were at c4. |
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| Jan-04-09 | | bullsbehad: So what happens if White accepts with 24. Qxe4?
Seems like there will be a Rook for Bishop/Knight exchange, but it seems white might have better options now? |
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| Jan-04-09 | | johnlspouge: Sunday (Insane):
J Heissler vs Kasimdzhanov, 1999 (23…?) Black to play and win.
Material: Down a P. The White Kg1 has 2 legal moves, both on the g-file, and is open to checks on the a8-h1 diagonal. The line-up on the d-file should draw attention. The White Bc4, Bd2, and Nd4 are protected by Qd3, which might become a target for an overburdening combination. Presently, the White Nd4 protects Qd3 from Bd7-f5, a move possibly initiating an overburdening. The Black Rc8 and Re8 both have open files, and both Bd7 and Bg7 control many squares. The Black Qd8 and particularly Nh7 require activation. The Black Kg8 is secure. Candidates (23…): b5, Qb6, Rxc4, Re4
23…Re4 (threatening 24…Rxd4)
White can accept the exchange sacrifice:
(1) 24.Qxe4 Rxc4 (threatening 24…Bxd4)
25.Bc3 [Be3 Bf5 then 26…Bxd4]
25…Bf5 26.Qe3 Bxd4 27.Bxd4 [else, drop B+N for R]
27…Qxd5+
Black has B+N for R after capturing Bd4.
White can refuse the exchange sacrifice, but if Nd4 moves, White drops Bc4: (2) 24.Bc3 [Be3 Rxe3 25.Qxe3 Rxc4]
24…Rxd4 25.Bxd4 [else, drop a N]
25…Bf5 26.Qc3 [else, drop one of the Bs]
<[Here I deviated from best play with 26…b5. From 26…b5, Toga II 1.3.1 gives best play 27.b3 bxc4 28.Bxg7 Qxd5+, with about 0.2 Ps advantage for Black. The rest of my post therefore has limited interest with respect to the puzzle.]> 26...b5
27.Bxg7 Rxc4 28.Qe5 [else, drop Bg7]
28…Re4 29.Qc3
Black can draw by see-sawing with 30…Rc4 31.Qe5 Re4 Qc3, etc., so the variation is justified. He can also play for a win with 29…Qxd5 (threatening 30…Re3+ 31…Rxc3)
The discovered check 30…Re8+ provides a nuclear deterrent protecting the 8-th rank. 30.Kg1 [Rf3 Rxf4 then 31…Nxg4]
30…Nxg5 (threatening 31…Nh3+ then 32…Re2+ or 32…Re3+) The second sacrifice looks promising, because the dead Nh7 can now join the attack. That’s enough. Having seen the game, I am glad I quit when I did :) |
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Jan-04-09
 | | Jimfromprovidence: This is just a minor critique of this masterpiece. 27 Be4+ first, then after 27…Kh1, 28 Rxc4 seems to win more material.
click for larger view
Notice how white cannot play 29 Qxc4 because of 29…Nh3#!. In this case 29 fxg5 looks best. Black follows with 29…Rxc3, then 30 Bxc3 Qxg5+ 31 Kf2 Bxd5 and black is sitting pretty.
click for larger view |
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| Jan-04-09 | | lost in space: I thought about
23...Qe7 24. Ba2 Qe4+ 25. Qxe4 Rxe4 26. Nf3 Bg4 27. Rae1 Rxe1 28. Rxe1 Bxb2 29. Ng1 Bxa3 with black advantage. |
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| Jan-04-09 | | RandomVisitor: After 23...Re4, best might be 24.Nc6!?
click for larger viewafter a sequence involving 8 captures in a row,
[-2.20] d=22 24.Nc6 Qe8 25.Rae1 Bf5 26.Nxa7 Rxe1 27.Rxe1 Qxe1 28.Bxe1 Bxd3 29.Nxc8 Bxc4 30.Nb6 
click for larger viewAlthough white is playing a lost position, Black will have trouble getting his extra piece into play and might slip. |
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| Jan-04-09 | | tallinn: <TommyC: Re4 not hard to find> To justify Re4 one has not only to see how to refute Qxe4. With Re4 Rxd4 is obligatory and after Qc3 Nxg5 is the only winning move(b5 escapes to a draw only). <RandomVistor: Bc6> Indeed that was the defense Fritz was throwing at me and I even did not find my way up to 30. Nb6 without help. However that position is won even by a mediocre player like me - you have to win the white pawn on d5: (30. Nb6) Bb3 Bc3 Bf8 Bb4 (Bd4 Bd6 Be3 Bc7 and the white pawn on d5 gets lost as well) Bxb4 axb Kf8 and white's pawn on d5 gets lost soon. After that the black knight enter into play. It helps black a lot that all his pawns are on white squares. That black has a win with Re4 here is really amazing as black is really a piece down in the position. And yet Kasim shows that the poor knight h7 is indeed the game winner. |
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| Jan-04-09 | | RandomVisitor: If white had played 23.Rg1 instead of 23.f4, the game might continue:
click for larger view [-0.07] d=21 23.Rg1 Qc7 24.Bb3 Qe5 25.Bc3 Qe3 26.Rad1 Bxd4 27.Bxd4 Qf4 28.Rgf1 a6 29.Qd2 Qxd2 30.Rxd2 Nxg5 31.d6 Bb5 32.Bf6 Bxf1 33.d7 Nh7 34.Bc3 Bh3 35.dxe8Q Rxe8 36.Rd6 Nf8 37.Bd5 Re7 (4:02.54) 679492kN |
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| Jan-04-09 | | beginner64: The only thing worthwhile that I have to add is that 40. Rc7 was a very surprising move from Heissler. All his previous moves had suggested to me that he knew that he could not move either rook off the 1st and second ranks. |
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| Jan-05-09 | | patzer2: For the Sunday Jan 4, 2009 puzzle solution, Black demonstrates that a counter attack in the center can be a decisive counter to a flank attack. Specifically, in this game, Black's decoy and deflection sham sacrifice 23...Re4!! lands like a bomb in White's center -- leaving him with too many weaknesses in the center and on his over extended King side. Here's my computer (Fritz) checked breakout:
<23...Re4!!> This decoy sacrifice offer amounts to a poison piece, which destroys White's position if he accepts it and leaves him with a technically lost position if he declines it. <24. Bc3>
White, if he accepts the sacrifice, loses quickly to a double attack after 24. Qxe4 Rxc4 25. Bc3 Bf5! 26. Qe3 (
26. Qf3 Bxd4 27. Bxd4 Rxd4 28. Rae1 Rxd5  ) 26... Bxd4 27. Bxd4 Qxd5+ 28. Kg1 Rxd4 . <24... Rxd4! 25. Bxd4 Bf5 26. Qc3> If 26. Qe3, then Black secures a decisive advantage after 26...Rxc4 27. Bxg7 Qxd5+ 28. Kg1 Kxg7 29. Rad1 Qc6 30. Qe5+ Kg8 31. Rd6 Qc7 32. Rfd1 Nf8 33. Qe3 Ne6 34. Rd7 Qxf4 . <26... Nxg5!> Black offers a second poisoned piece, and prepares a decisive King side assault. <27. Bxg7>
Accepting the sacrifice with 27. fxg5 loses quickly after 27...Be4+! (27... Rxc4 28. Qf3 Rxd4 ) 28. Kg1 Qxg5+, when play might continue 29. Kf2 Rxc4 30. Qxc4 Qd2+ 31. Kg3 h4+ 32. Kg4 f5+ 33. Rxf5 gxf5+ 34. Kxh4 Qxh2+ 35. Kg5 Qh6#. <27... Rxc4>
This wins slowly but even better is 27... Be4+! 28. Kg1 Rxc4 29. Qe3 (29. Qxc4 Nh3#) 29... Qb6!, when play might continue 30. Rfe1 (30. Qxb6 Nh3#) 30... Rc2 31. Re2 Rxe2 32. Qxb6 axb6 33. fxg5 Kxg7 . <28. Qxc4 Be4+ 29. Qxe4 Nxe4 30. Be5 Qxd5 31. Kg1 Ng5 32. fxg5 Qxe5 33. Rf2 Qxg5+ 34. Kh1 h4 35. Raf1 h3 36. Rd1 Qe3 37. Rdf1 Qe4+ 38. Kg1 g5 39. Rc1 Kg7 40. Rc7 Qg4+ 0-1> White resigns in lieu of 41. Rh1 (41. Rf1 Qd1#) Qd1+ 42. Rf1 Qxf1#. |
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| Jan-05-09 | | TheBish: Wow, what a game! I was on the right track, looking at 23...Rxc4 24. Qxc4 Re4, and started to look at 23...Re4 (which is similar, only better), but didn't have much time for this one before the next problem was posted. I definitely didn't see half the stuff that happened after 23...Re4!!, but 26...Nxg5! was a nice move too, maybe deserving two exclams as well. (Or not... what's the knight going to do if it doesn't sac on g5?) Actually, 26...Nxg5! was easier to see than 23...Re4!!, because you really needed to see the knight sac to justify the exchange sac (24...Rxd4!). Great lesson in advanced tactics! |
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| Jan-05-09 | | patzer2: In addition to 24. Nc6!?, as analyzed with Rybka by <RandomVisitor>, another interesting defensive possibility is 29. Rf3!?. After 29. Rf3!? Bxf3+ 30. Kg1 (diagram below)
click for larger viewBlack wins. But how?
The tempting 30...Nh3+? 31. Kf1 Bxd5 32. Qd4 Nxf5 33. Qxf4 Kxg7= doesn't do much more than let White back in the game. Instead, Black appears to gain a decisive advantage with 30...Bxd5! 31. Qc3 Ne4!  (diagram below). 
click for larger viewFrom here, Fritz indicates play might continue 32. Qd4 Qd7! 33. f5 Qxf5 34. Be5 Qg5+! 35. Kf1 Nd2+ 36. Ke2 Bf3+ 37. Ke1 Nb3 (-4.56 @ 15 depth) with a Knight Fork and a winning material advantage. |
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| Jan-05-09 | | njchess: This puzzle is good example of strategic elements dictating tactics. After 23. f4, White's king is not well protected. His pieces are not directly attacking anything (meaning Black has tempo if he wants it). His pawn skeleton is poor because it features an isolated queen pawn (IQP) and a fragmented king side highlighted by his backward f-pawn. His bishops, though centrally placed, have little scope at the moment. His rooks have not yet entered play, and his knight and queen, though centrally placed, are pinned by Black's powerful fianchetto bishop. Finally, his queen is a bit overworked protecting his knight and bishop. All of the above means that White will have to spend moves organizing his pieces. He does have some decent moves to do this, namely Bc3 as well as moving his rooks. He would like to play f5 at some point. But to do that will require more preparatory moves. In contrast, Black's position is more harmonious. His king is well protected. His rooks are active. His bishops have open lines and his pawn structure is solid. Moreover, he has the initiative. And, given White's position, he should take it. The only sour point to his position is his poorly placed knight. Given the above, attacking White's IQP via his knight or his bishop seems logical enough. I selected b5, Rxc4, Qb6 and Re4. b5 does not appeal to me because it is not forcing (White need not take), it weakens Black's queen side pawns and it gives White's knight a target. Rxc4 goes nowhere after Qxc4, so I drop it. Qb6 is more subtle but after the obvious Bc3, my queen is poorly placed. So, I'm left with Re4 or finding something else. 23. ... Re4 24. Bc3 (24. Qxe4 Rxc4 25. Bc3 Bf5 26. Qd2 Qxd5+ is better for Black) Rxd4! 25. Bxd4 Bf5 26. Qc3 and White is in trouble. 26. ... Be4+ 27. Kg1 Nxg5! 28. Bxg7 (28. fxg5 Qxg5+ is better for Black) Rxc4! or 26. ... Nxg5! 27. Bxg7 Be4+ 28. Kg1 Rxc4! or 26. ... Nxg5! 27. Bxg7 Rxc4! 28. Qxc4 Be4+ are all good for Black. The first two lines threaten mate with Nh3 while the third line nets the queen after 29. Qxe4 Nxe4. I'm confident about Black's 23rd move being Re4. I'm more curious about Black's 26 - 28 moves. I got my solution in about 5 minutes up to the 28th move when Black is  so I think I would have got his one over the board. Time to check. |
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| Jan-07-09 | | notyetagm: J Heissler vs Kasimdzhanov, 1999 <Resignation Trap: This is how the young Kasimdzhanov has played. Out of nowhere, or so it seems, comes a long combination starting with 23...Re4!! After the combination, we reach a winning endgame. Heissler could have delayed his defeat with 40. Rc3, instead of 40. Rc7?> <znprdx: Certainly one of the most profound illustrations of inspired combinational play...I can't recall seeing this beauty and depth from our top players.... but I guess this gem is flawed by the fact his opponent is a full class lower
Even seeing the moves as played - I didn't immediately grasp the point - which I more often than not do. This is amazing magic ...26.Nxg5 WOW> Yes, anyone who has watched Kasimdzhanov play blitz on ICC or playchess knows that he has *incredible* tactical skill. Playing as <R-Kasimdzhanov> on ICC he achieved an astronomical peak rating of 3590(!). http://www.chessclub.com/finger/R-k... |
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| Jan-10-09 | | Antonius Blok: <stukkenjager> Yep! Once again my exchange variation was blindly guided by matters of material logic! I forgot how strong can be the couple of Bishops!
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| Apr-08-09 | | whiteshark: Better was <20.Qb3!>. 
click for larger viewThe ♕ is not exposed as on d3, ♗c4, ♙b2 and 3rd rank are well protected. |
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| Apr-08-09 | | whiteshark: Here is one sample line after <20.Qb3!>: <20...Nxg4 21.Ne6! Qh4> what else? <22.fxg4 fxe6> no choices on both sides
<23.dxe6 Bc6+ 24.Bd5 Qxg4!> 
click for larger view <25.Bxc6 bxc6 26.e7+! Kh8 27.Re1> 
click for larger view Position is in balance. |
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| Apr-08-09 | | OrangeBishop: Just came across this puzzle now. What is disconcerting to me is that even if I saw as far as ahead as move 30 (below), I'm not sure I would have evaluated it as clearly winning for Black. I suppose Black has a centralized queen and relatively safe king while White has uncoordinated rooks and a very vulnerable king. But still...
click for larger view |
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| Apr-08-09 | | Udit Narayan: Kasimdzhanov played some amazing chess here!!! |
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sac: 24...Rxd4