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| Feb-27-16 | | alfiere nero: I saw the first four moves (that's it!) easily: so exciting .... |
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| Feb-27-16 | | alfiere nero: I agree, 10 ... g6 seems much better than f5, which creates a weakness in an area under attack. |
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| Feb-27-16 | | alfiere nero: Nice game.
Was 15 Nxd4 to open the black bishop line? |
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| Feb-27-16 | | ndg2: Got up to 29...Kh8 but wanted to continue with 30. Qh6 or 30. Bg8. |
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| Feb-27-16 | | morfishine: Black is forcing so White must force first: <26.Rxg7+> 26...Bxg7 27.Bh7+ Kh8
28.Bxg7+ Kxg7 29.Qg6+ Kh8 and here after <30.Qh5> White's position becomes thematic with the remaining rook going to the g-file while threatening an exposed check ***** |
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| Feb-27-16 | | agb2002: White has an extra pawn.
Black threatens 26... Qa3+ and mate next.
This threat leads to consider 26.Rxg7+ Bxg7 (26... Kh8 27.Rh7+ Kg8 28.Rg1+ and mate next) 27.Bh7+: A) 27... Kf7 28.Qg6+ Ke7 (28... Kg8 29.Qxg7#) 29.Qxg7+ A.1) 29... Rf7 30.Bg5+ Ke8 (30... Kf8 31.Qg8#; 30... Kd7 31.Qxf7+ + - [B+2P]) 31.Qg8+ Rf8 (31... Kd7 32.Qd8+ Kc6 33.Qd6#) 32.Bg6+ Kd7 33.Qh7+ (to make possible the bishop check on e4) 33... Kc6 (33... Rf7 34.Qxf7+ + - [R+2P]) 34.Be4+ Kxc5 35.Qe7+ wins the queen and mates soon. A.2) 29... Kd8 30.Bg5+ and mate in two.
A.3) 29... Ke8 30.Bg6+ and mate in three.
B) 27... Kh8 28.Bxg7+ Kxg7 29.Qg6+ Kh8 30.Bg8 (threatens 30.Qh7#, 30.Rh1+ Qh4 31.Rxh4# and 30.Rg1-Qg7#) 30... Qa3+ (30... Qxc5+ 31.Kb1 wins) 31.Kc2 Qa2+ (31... Qxc5+ 32.Kb1 wins) 32.Kc3 Rf3+ 33.d3 Rxd3+ 34.Rxd3 Qa1+ 35.Kd2 Qb2+ 36.Ke1 and the king goes to g2, winning. |
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| Feb-27-16 | | agb2002: My 30.Bg8 loses to 30... Qxc5+ 31.Kb2 (31.Kb1 Qf5+, what I missed) 31... Qe5+ followed by 32... Qg7. Better luck next time. |
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| Feb-27-16 | | The Kings Domain: Nice set piece paving the way for a good attack. |
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Feb-27-16
 | | piltdown man: The first few moves were easy to find. Too easy for a Saturday puzzle. |
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| Feb-27-16 | | morfishine: <piltdown man> Yes, the solution becomes simplified when its basically forced |
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| Feb-27-16 | | thegoodanarchist: Today's puzzle, White to move and win on 26.?, is a twist on the classic double bishop sacrifice, which is usually taught to chess students with the Lasker game where he captures pawns. At least, I think it was a Lasker game. |
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| Feb-27-16 | | RandomVisitor: Black could try 12...d4 or 13...d4 to retain an advantage. The whole queen adventure with 13...Qh5 is likely misguided, allowing white time to reorganize his pieces for the inevitable kingside attack. |
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| Feb-27-16 | | luftforlife: <thegoodanarchist>: Might this be the game to which you refer?: Lasker vs J Bauer, 1889
Regards, ~ lufty |
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| Feb-27-16 | | patzer2: For today's Saturday puzzle (26. ?), desperate measures are called for as Black threatens mate-in-two (i.e. 26. Bxg7?? Qa3+ 27. Kb1 Qa1#). The solution is a desperado demolition and pursuit combination, which was a little too deep for me to see all the way through to a win for White. However, with the computer and the Deep Fritz 15 Chess program, I was able to break it down and understand it much better. Turns out White has two good solutions. Strongest is the game continuation with the sham Rook sacrifice 26. Rxg7+!!  (forcing mate in 13 moves according to Fritz 15 @ 25 depth and Houdini 3 at 24 depth). Second best is 26. Bh7+! (+13.15 @ 22 depth, Komodo 9.02). Here's my look at the puzzle (26. ?) and <RV>'s excellent Black improvement 12...d4 = to  with Deep Fritz 15: [Event "Leonid Stein Memorial"]
[Site "Lvov UKR"]
[Date "2000.05.12"]
[Round "1"]
[White "Michal Krasenkow"]
[Black "Oleg Romanishin"]
[Result "1-0"]
[ECO "A18"]
[WhiteElo "2661"]
[BlackElo "2578"]
[PlyCount "81"]
[EventDate "2000.05.12"]
1. Nf3 Nf6 2. c4 e6 3. Nc3 Bb4 4. g4 O-O 5. g5 Ne8 6. Qc2 d5 7. b3 Be7 8. Rg1
c5 9. e3 Nc6 10. Bd3 f5 11. gxf6 Nxf6 12. a3 Qe8 (12... d4 13. Ne4 Ng4 14. Rxg4
Rxf3 15. Rg3 Rf5 16. Bb2 Ne5 17. f4 Nxd3+ 18. Qxd3 b5 =) 13. Bb2 Qh5 14. Be2
d4 15. Nxd4 Nxd4 16. exd4 Qxh2 17. O-O-O cxd4 18. Ne4 Qf4 19. Bd3 Nxe4 20. Bxe4
h6 21. Bxd4 Bf6 22. Be3 Qd6 23. c5 Qa6 24. a4 Qa5 25. Bxh6 Qb4 26. Rxg7+ (26.
Bxg7 ?? Qa3+ 27. Kb1 Qa1#) (26. Bh7+ Kh8 (26... Kf7 27. Rxg7+ Ke8 28. Bg6+
Kd8 29. Qd3+ Qd4 30. Qxd4+ Bxd4 31. Bg5+ Bf6 32. Bxf6+ Rxf6 33. Rh1) 27. Bxg7+
Bxg7 28. Rxg7 Kxg7 29. Qg6+ Kh8 30. Qh5 (30. Qh6 ? Qf4 =) 30... Qa3+ (30...
Qf4 31. Bd3+ Kg7 32. Qg6+ Kh8 33. Qh7#) 31. Kc2 Qa2+ 32. Kc3 Rxf2 33. Bf5+ Kg7
34. Rg1+ Kf8 35. Qh6+ Ke8 36. Rg8+ Ke7 (36... Kd7 37. Qxe6+ Kc7 38. Qd6#) 37.
Qg7#) 26... Bxg7 27. Bh7+ Kh8 (27... Kf7 28. Qg6+ Ke7 29. Qxg7+ Rf7 30. Bg5+
Ke8 31. Qg8+ Rf8 32. Bg6+ Kd7 33. Qxf8 Qa3+ 34. Kc2 Qa2+ 35. Kc3 Qxb3+ 36. Kxb3
Kc7 37. Qd6#) 28. Bxg7+ Kxg7 29. Qg6+ Kh8 30. Qh5 Rxf2 31. Be4+ (31. Bf5+ Kg7
32. Rg1+ Kf6 33. Rg6+ Ke7 (33... Ke5 34. Bxe6+ Ke4 35. Qd5+ Kf4 36. Rg4#) 34.
Qh7+ Kd8 35. Rg8#) 31... Kg7 32. Rg1+ Kf8 33. Qh6+ Ke7 34. Rg7+ Rf7 35. Qg5+
Ke8 (35... Kf8 36. Rg8#) 36. Rg8+ Rf8 37. Qg6+ Ke7 38. Rg7+ Kd8 39. Qg5+ Rf6
40. Qxf6+ Ke8 41. Qe7# 1-0
Copy and past it to a Chess program to see the variations I explored move-by-move with Deep Fritz 15 x 64, using a PC with an i7 quad core (3.6 GHZ processor) and 16 GB RAM. |
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| Feb-27-16 | | kevin86: The rook sacrifice gets the ball rolling. |
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| Feb-27-16 | | whiteshark: A consistent application of the <forcing moves principle> would have helped my to solve this puzzle ... |
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| Feb-27-16 | | john barleycorn: <whiteshark: A consistent application of the <forcing moves principle> would have helped my to solve this puzzle ...> latest and greatest commentary on a move given 2 exclamation marks:
"this is the best move here even though it is forced" |
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| Feb-27-16 | | Patriot: This isn't absolutely forced. Yes, black threatens 26...Qa3+ and mate next but checks are not absolutely forced for white. 26.Kb1 stops the mate threat since 26...Qa3 27.Qa2 Qxc4. 26.Qc4 could be another option since 26...Qa3+ 27.Kc2. Just saying this is a puzzle so we know other options are probably not right, but during a game that logic doesn't work. So if there is plenty of time one would have to make sure 26.Rxg7+ works by analyzing in detail! I didn't work out all the kinks but saw most of it. |
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| Feb-27-16 | | patzer2: <Patriot> Thanks for pointing out 26. Kb1! when simpler, non-sacrificial winning play might go 26...Qd4 (26...Qa3 27. d4 (+3.71 @ 16 depth, Deep Fritz 15) 27. Ka2 (+3.45 @ 17 depth). P.S.: Guess desperate measures with 26. Rxg7+!! weren't forced for those of us who have difficulty seeing mate-in-13. |
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| Feb-27-16 | | Patriot: Thanks <patzer2>! At first I really thought white HAD to check in order to stop mate, but my focus lately has been on move options so then I started seeing other ways to deal with the mate threat and that they may be sufficient to win because white has a lot of pressure on the black kingside. I missed that after 26.Kb1 Qa3 27.d4 was far better even though that wasn't my point. But again, 27.d4 is yet another option white has! |
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| Feb-27-16 | | Patriot: <patzer2> Just to clarify, I meant that 26.Kb1 Qa3 27.d4 was far better than 27.Qa2--not that it's better than the game move. |
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| Feb-27-16 | | BOSTER: " There are scandals even in the most noble families " thought black queen crossing all chessboard, when rook a8 and bishop c8 were still watching this. |
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| Feb-27-16 | | dnp: chrisowen, good to see your posts again, they always crack me up. Nice one mate. |
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| Feb-27-16 | | Tiggler: I went for Bh7+ which also wins easily. |
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| Mar-10-16 | | thegoodanarchist: <lufty > I do believe you found the right game |
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Later Kibitzing> |
Kibitzing
sac: 26.Rxg7+