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|Oct-17-09|| ||David2009: Saturday's puzzle P Romanovsky vs N Grigoriev, 1924 White 24? Very difficult|
Level material, candidate move 24 Be6 hoping for fxe6? 25 dxf6 and penetrates. 24...Bxe6? 25 dxe6 is no better.
Meanwhile White is threatening 25 Bxf7. This leaves only 24... f6 (or f5). Both are met with 25 gxf6 and if exf6 26 Bg5
and all White's pieces are active. Thwe rest depends on Black's choice of defence.
Time to check that 24 Be6 f4 (or f5) 25 gxf6 was in fact
Black played 24...fxe6 after all. How odd. Time to peruse the game and find what I
Egg on my face. 24...fxe6? 25 dxe6? Qb7! 26 d5 Kc7 and now 27 Qf8?? Bxe6 wins easily. "The blunders are all thee waiting to be made" - Tartakower. Fortunately Qf8+ and Qg8 win easily (the game line). Over the board I might have spotted this - it is a chessplayer's priviledge to change his mind.
Crafty prefers 24 Qb7! (a defence I did not examine) jettisoning a Pawn.
Links (game, 24?) http://www.chessvideos.tv/endgame-t...
(game, 25?) http://www.chessvideos.tv/endgame-t...
|Oct-17-09|| ||Old Wolf: Lafreak the goal is to work out all variations, not just to find the next move.|
|Oct-17-09|| ||njchess: I've looked at this problem for about two minutes. Black's pieces are badly out of position. I think 24. Be6! is the killer move that pries apart Black's position. Time to check.|
|Oct-17-09|| ||Chessforeva: 3D version: http://chessforeva.appspot.com/C0_p...|
|Oct-17-09|| ||johnlspouge: Saturday (Very Difficult)
P Romanovsky vs N Grigoriev, 1924 (24.?)
White to play and win.
Material: Even. The Black Kd8 is stalemated. White has a doubled Pd4 and Pd5, enhancing the mobility of his pieces, because Re1 and the battery Rf1 and Qf3 have semi-open files. The stalemated Black Kd8 makes 24.Qxf7 attractive, because it might exploit the stalemated Kd8. The loose Black Rh7 is the only active Black piece, attacking Bh3. The White Bh3 mutually attacks Bc8, which might become a back-rank victim once Rf1 invades on f8. The White Kg1 is secured from check.
Candidates (24.): Qxf7, Be6
[24.Qxf7 Rxf7 25.Rxf7 Bxh3 26.Rf8+ Kd7 27.Rxa8 is unpromising]
24.Be6 (threatening 25.Bxf7 and collapse of the Black defense)
(1) Black can accept the sacrifice:
Candidates (25.): Qf8+, dxe6
Candidates (26.): dxe6+, Qg8, Bc1
[26.dxe6 Kc6 27.Qf3+ d5 is unpromising]
26.Qg8 Rh3 [or Rh4] [Rh5 28.Qxe6+ Ke8 29.Qxg6+ then 30.Qxh5]
27.Qxe6 Ke8 [Kd8 28.Rf8#]
28.Qg8+ Kd7 29.Bc1 (threatening 29.Rxe7+ Kxe7 30.Rf7#)
27…Bf6 28.Rxf6 (threatening 29.Rxe7+ 30.Rf7#)
Black will be mated, because of 28…exf6 29.Qe8#.
(2) Black can capture Be6:
24.Bxe6 dxe6 (threatening 25.Qxa8 or 26.exf7 27.e8=Q)
Black drops material to prevent 27.e8=Q.
(3) Black must therefore move Pf7, to prevent the favorable capture 25.Bxf7:
24…f6 [or f5] 25.gxf6
The White Be6 stands like a house, because White gains a tempo upon capture: (A) 25…Bxe6 25.dxe6 (threatening 26.Qxa8).
25…exf6 [Bxf6 is similar] 26.Bg5 (threatening 27.Bxf6 28.Qxf6+)
The Bg5 is immune because of the threat 27.Qf8#.
Black drops at least a P in the middle of a difficult position.
|Oct-17-09|| ||johnlspouge: I draw some consolation from the fact that others regarded 24.Qxf7 as an interesting try, too, but I burned a lot of time on refusal of 24.Qxf7. The most efficient pruning algorithm, however, is acceptance first, then refusal. Shame on me.|
Hi, <agb2002>. The sound you hear from my post is the crisp crack of self-flagellation.
|Oct-17-09|| ||5hrsolver: <al wazir: I found 24. Be6 without much trouble, despite its rather unforcing nature. But after 24...fxe6 I would have played 25. dxe6, with the double threat of Qf8# and Qxa8, winning the exchange. >|
25..Qb7 protects the rook and gives the king an escape square but even here after 26.Qf8 Kc7 27.Rf7 Rxf7 28.Pxf7 white still wins with the passed pawn.
<OBIT: After 24. Be6 f6, how about 25. gxf6 exf6 26. Bg5. >
I like the idea of 26.Bg5 a lot. It may be why black did not go into this line. His king would be open to attack in the center.
|Oct-17-09|| ||patzer2: Would anyone care to run a deep computer analysis on 24...Qb7! White gains a clear advantage, but I can't find a forced win after 25. Bxf7 .|
|Oct-17-09|| ||computer chess guy: <patzer2: Would anyone care to run a deep computer analysis on 24...Qb7! >
After 24. .. ♕b7 25. ♗xf7 ♗f5 White does indeed have advantage but it seems there is no easy way to break through:|
click for larger view
Analysis by Rybka 3 32-bit (depth 18):
1. (1.35): 26.Be6 Bd3 27.Rf2 Kc7 28.Rd1 Kb6 29.Rxd3 cxd3 30.Bd2 Qb8 31.Qxd3 Qe8 32.b3 Rb8 33.c4 bxc4 34.bxc4 Ka7 35.Be3 Rh4 36.h3 Rb4 37.c5 Bxd4 38.c6 Bxe3 39.Qxe3+ Ka8 40.c7 Rhc4
2. (1.25): 26.Bg8 Rg7 27.Be6 Bxe6 28.dxe6 Qxf3 29.Rxf3 Rg8 30.Kg2 Rb8 31.Bd2 Ke8 32.Kg3 d5 33.h4 b4 34.cxb4 Bxd4 35.Bc3 Ba7 36.Rd1
3. -/= (-1.28): 26.Bxg6 Bxg6 27.Qg2 Kc7 28.b3 Rg8 29.bxc4 bxc4 30.Rf2 Kd8 31.Rb2 Qc8 32.Bf2 Rf7 33.h4 Bh5 34.Qe4
|Oct-17-09|| ||Bootvis: Solved most of it for once :)
Why didn't white play 30 Rexe7?
|Oct-17-09|| ||CHESSTTCAMPS: Material is even, but white has the advantage in development, mobility, and king safety. The critical semi-open e and f-files are completely controlled by white's majors, whereas the Rh7 will have trouble controlling the h-file, given the separation of force (especially rooks) and queenside congestion that is caused by black's king caught in the middle. The doubled d-pawns enhance white's control of the center and his space advantage. White's move is rather telegraphed by the situation: the Bh3 must either be exchanged on c8 (allowing black's king to run from trouble) or must retreat to g2, right?|
Wrong - there's an active third alternative. Now black must strive to keep the game closed, because accepting the bishop allows a devastating invasion of majors:
A) 24... fxe6 25.Qf8+ Kd7 26.Qg8 Rh3 27.Qe6+ Ke8 (Kd8 28.Rf8#) 28.Qxg6+ Kd7 (Kd8 29.Rf8+ Ke7 30.Qe6#) 29.Rf8 Qb7 (to avoid Qe6#) 30.Bf4! Kc7 31.Rxe7+ Bd7 32.Qxd6#
A.1) 26... Rg7 27.Qxh8 wins
A.2) 26... Rh5 can be played like the main line, but 28.Qxg6+ optionally picks up the Rh5
A.3) 26... Rh4 27.Qe6+ Ke8 28.Qxg6+ Kd7 29.Rf8 Qb7 30.Bf2! Rg4+ 31.Kh1 Kc7 32.Rxe7+ Bd7 33.Rxd7+ Kxd7 34.Rf7+ Kc8 35.Qe6+! cleans up.
A.4) 29... Qb8 30.Bf4 Kc7 31.Rxe7+ Kb6 (Bd7 32.Rxb8 Rxb8 33.Qe6/f5 picks up the Ra3) 32.Bxd6 wins the Q.
A.5) 29... Qb6 30.Qe6+ Kc7 31.Rxc8+ Rxc8 32.Qxh3 wins
B) 24... Bxe6 25.dxe6 Ra8 moves (else 26.Qxa8+) 26.exf7 wins
However, keeping the game closed is not possible if white plays correctly.
C) 24... f6/f5 25.gxf6 (e.p.) Bxf6 26.Bg5! Bg7 (Bxg5 or Bh8 27.Qf8#) 27.Qf7 threatening Qg8+ wins
C.1) 26... Bxe6 27.dxe6 Rb8/c8) (else 28.Qxa8+) 28.Bxf6 exf6 29.e7+! (Qxf6+? Qe7 30.Qxg6?? Rg7) Rxe7 30.Qxf6 and the threat of Qf8+ wins
C.2) 25... exf6 26.Bg5! Qe7 (fxg5 27.Qf8#) 27.Bxc8 wins
C.2.1) 26... Bxe6 27.Bxf6+ Bxf6 28.Qxf6+ Qe7 29.Rxe7 Qxf6 30.R1xf6 Rc8 31.Rxd6+ gets to an easily won ending.
D) 24... Other 25.Bxf7 Rh3 26.Qg2 followed by 27.Bxg6 wins easily.
Time to check...
|Oct-17-09|| ||playground player: Note for beginners: I saw Be6 "instantly." No, it's not magic. You learn to see moves like that after doing hundreds and hundreds of these puzzles and replaying hundreds and hundreds of recorded games--and then you see a move like that because you've seen it before, and seen how it works.|
|Oct-17-09|| ||BOSTER: White pieces are more active ,they have two open files "e" and "f", more space. Pawns d5 and g5 crossed the equator ,but they looks like obstacles for white.
Black position is very cramped , black king in the center of the board, rook h7 and bishop h8 reminds a desert island which has no any communication with land .
Because the bishop
on h3 attacked twice and moves like Bg2 or Bg4 are not very attractive decision is Be6!
Black can not play fxe6 because they will lose an exchange in couple moves.
So 24.Be6 f5
29.Rxf6 and white has the winnning position .
|Oct-17-09|| ||tivrfoa: Do you agree that sometimes Saturday seems less difficult than Friday, Thursday, etc? :]|
|Oct-17-09|| ||A Karpov Fan: missed it|
|Oct-17-09|| ||patzer2: <computerchessguy> Thanks for the Rybka analysis. It seems White is just on the verge of busting out a win after 24. Be6 Qb7! 25. Bxf7 Bf5 26. Be6 Bd3 , but despite the clear advantage forcing the issue is difficult. Also in this line, I'd think 26...Bxe6 here is not a bad try for Black either.|
P.S.: For those who want some practice in this line, try the first link at <David2009>'s post. It's pretty good practice in this position against a strong Crafty program, which followed this line when I tried it.
Pitting Fritz against the online Crafty program in a quick game yielded a win after 24. Be6 Qb7! 25. Bxf7 Bf5 26. Be6 Bd3 27. Rf2 Kc7 28. Bf4 Kb6 29. Re3 Qb8 30. b3 Qd8 31. bxc4 bxc4 32. Rxd3 cxd3 33. Qxd3 Rg7 34. c4 Ka7 35. c5 Rb8 36. Kg2 Qc7 37. Rc2 Qd8 38. a3 Qf8 39. Bd2 Qd8 40. Rc4 Rb2 41. Ra4 a5 42. Kg3 dxc5 43. Rxa5+ Qxa5 44. Bxa5 Rh7 45. Bc3 Bxd4 46. Bxd4 cxd4 47. Qxd4+ Rb6 48. a4 Kb7 (48... Ka6 49. Bc8+ Ka5 50. Qc5+ ) 49. Bc8+ Kxc8 50. Qxb6 . However, this is no where as deep as the Rybka analysis given above. So I don't put a lot of stock in this result.
|Oct-17-09|| ||chrisowen: I'm near oh damn missed it. Looks like Bxc8 is not winning. Perhaps I should go back again. The devilish Be6 is the detailed move. Be6 is beastly, the revelation of Be6 dawned once I couldn't get Bxc8 to work.|
|Oct-17-09|| ||PhilFeeley: I went for the queen sac (Qxf7) but I guess it's not good enough.|
|Oct-17-09|| ||DarthStapler: I got the first move and considered the second move|
|Oct-17-09|| ||WhiteRook48: I tried Qxf7???|
|Oct-17-09|| ||BOSTER: No doubt that move 24...Qb7 <patzer2> is the good defensive move and black can play much longer then in the real game.But, is this enough to equalize the game?|
|Oct-18-09|| ||patzer2: <Boster> Probably against best play 24...Qb7 is not enough to equalize, but it may be enough to draw. Certainly against less than strong play, it's enough for a higher rated player with the Black pieces to equalize and even win.|
|Oct-25-09|| ||LIFE Master AJ: [Event "URS-ch03"]
[White "Romanovsky, Peter Arsenievich"]
[Black "Grigoriev, Nikolay Dmitrievich"]
1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. Nge2 a6 6. d3 b5 7. O-O Bb7 8. f4 Nd4 9. Nd5 d6 10. c3 Ne6 11. f5 Nc7 12. Nef4 Nf6 13. Nxc7+ Qxc7 14. Nd5 Nxd5 15. exd5 c4 16. fxg6 hxg6 17. d4 Bf6 18. Be3 Rh5 19. g4 Rh4 20. g5 Bh8 21. Qf3 Rh7 22. Bh3 Kd8 23. Rae1 Bc8 24. Be6 fxe6 25. Qf8+ Kd7 26. Qg8 exd5 27. Qxh7 Bb7 28. Rf7 Qd8 29. Bd2 Kc6 30. Rfxe7 Qc8 31. R1e6 Kb6 32. Rxb7+ 1-0
|Apr-06-16|| ||SimplicityRichard: A brilliant game! Nevertheless, the ECO for this game is not A07 but B23; this is not a King's Indian Attack but a Closed Sicilian Fianchetto variation.#|
|Apr-06-16|| ||SimplicityRichard: Or more precisely B24 as indirectly pointed out by <LIFE Master AJ> game illustration.#|
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