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| Dec-21-07 | | Desu: So close :< |
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| Dec-21-07 | | totalnewbie: The knight has a nice square at f6 and the bishop sacrifice is so typical so I instantly included those in my list of moves. Unfortunately I didn't see the final solution but couldn't figure out how to move the f3 knight forcefully. I guess this is how it's done. Would 21. ... Kf8 have helped black's cause? |
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| Dec-21-07 | | TrueBlue: I think I got it. Bxh6 should work. Next moves depend on whether black takes the bishop. If he doesn't, Bxg7. If he does, Qd2 is cute with double attack: the night on a5 and the pawn on h6. |
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| Dec-21-07 | | TrueBlue: well, there were plethora of variations, the one played was kind of strange :) |
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| Dec-21-07 | | areknames: I dunno, 22.Bxh6 seems pretty intuitive to me. I don't think declining the sac is an option, and after 23.Nf6+ it's difficult to like black's position. The only counterplay seems to be Nb3 at some stage...I certainly would sac the bishop OTB without too much thought. |
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| Dec-21-07 | | mkrk17: I saw Bxh6, then moves like Nf6+, also Qd2 attacking the Na5 and the loose pawn at h6, etc. I guess the solution depends on what black plays. My line went something like this:
Bxh6 gxh6, Nf6+ Kg7, Nh4 (threatening Nf5 royal fork) K~, Qd2 threatening both Na5 and pawn at h6. White has an overwhelming force against the open king. Nf6, Nf3 goes upto f5, Q at h6, shd be enough to net the black king. |
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| Dec-21-07 | | whitebeach: Well, Bxh6 of course. I didn't see 22 . . . c5, and I bet most others won't see it either, not because it's subtle or good but because it accomplishes nothing and seems to represent pure desperation. The black K side is ripped open and all the white sharks are going to home in on the feast. |
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| Dec-21-07 | | zooter: I did see 22.Bxh6 gxh6 23.Qd2 pretty much winning.... but off course, i didn't see 22...c5 which really i don't think even white calculated when he thought of 22.Bxh6 should i take the credit or not making my score an enviable 4/4? :) |
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| Dec-21-07 | | DarthStapler: My idea was Bxh6 gxh6 Nf6+ and then trying to get the king to take the knight on e8 after it took the rook and fork the knight with Qa4+, but I couldn't see how to get it to work. |
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| Dec-21-07 | | patzer2: The solution to today's Friday puzzle is Gipslis demolition of pawn structure combination, beginning with 21. Bxh6!! Breaking it out with Fritz 8:
<22. Bxh6!! c5>
[If Black accepts the sacrifice, then 22... gxh6 23. Nf6+ Kg7 24. Nh4! Kh8 (24... Qf8 25. Re3 Kh8 26. Rg3 Ng5 27. Rxg5 hxg5 28. Qh5+ Kg7 29. Nf5#) 25. Qh5! Qf8 26. Re3 Nf4 27. Qf5 Ng6
28. e6 Rxe6 29. Rxe6 Qg7 30. Rae1 fxe6 31. Nxg6+ Qxg6 32. Qxg6  is winning.] <23. Bxg7 Nxg7 24. Nf6+ Kf8 25. Ng5 Qd8 26. Qf3> [ Also winning and perhaps stronger is 26. Qg4 Nb3 (26... Ne6 27. Nfh7+ Ke7 28. Nxe6 fxe6 29. Qg7#; 26... Nc4 27. Ngh7+ Ke7 28. Qxg7 Rh8 29. e6 ) 27. Ngh7+ Ke7 .] <26... Ke7 27. Nxe8 Qxe8 28. Qf6+ Kf8> [No help for Black is 28... Kd7 29. Qxg7 .]
<29. e6 1-0>
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| Dec-21-07 | | dzechiel: White to move. Material even. "Difficult."
There seem to be two primary candidate moves here, both forcing: - 22 Nf6+
- 22 Bxh6
The move 22 Nxg7 should also be considered, but I don't think it has the same punch as the others. After several minutes I gotta believe that it's the bishop sac. Let's see 22 Bxh6 gxh6
what else for black? Not taking just loses a pawn and invites more agressive moves by white. 23 Nf6+
The king must move (black doesn't want to surrender the queen), but where to? There are three legal king moves: - 23...Kf8
- 23...Kh8
- 23...Kg7
The latter, 23...Kh8 invites 24 Qd3 (or c2 or b1) with a mate threat that is tough to stop. I think we can safely eliminate 23...Kh8. How about 23...Kf8, is that playable? In this case 24 Qd2 threatens 25 Qxh6+ Ng7 26 Qh8# as well as the more prosaic 25 Qxa5 recovering our material. This leaves 23...Kg7. Now white plays 24 Nh4 with the ugly threat of 25 Nf5+ forking king and queen. I would work on this more, but I gotta get some sleep tonight. I'm fairly confident that this is the line from the game, the white pieces are all working togther well. Time to check. |
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| Dec-21-07 | | dzechiel: I guess black CAN refuse the bishop sacrifice. A very pretty ending to this game. |
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| Dec-21-07 | | Sailfish: i don't really see the entire checkmate... i am seeing that Black could go 29... Qe7 and then get out of the situation with simply an exchange of queens and maybe losing 1 pawn also. could someone explain how this is mate? Sorry i'm a novice :) |
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| Dec-21-07 | | patzer2: <Sailfish:> The move 29...Qe7 is met with 30. Nh7+ Ke1 31. exf7+ . |
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| Dec-21-07 | | willyfly: Equal material. Once again White has the advantage of space - hence greater mobility of pieces. I am looking for the possibility of an attack on the Black ♔ since White has so many pieces massed on that side of the board. ♘f6 would be a nice fork on ♔ and ♖ but the f6 square is defended twice. There is also the idea of a battery forming ♕d2 but the ♕'s threat to the a5♘ would bring the ♘ to c4 attacking the ♕. But ahah! 22 ♘f6+ The ♕ can't take the ♘ so 22...gxf6 is necessary. Now... 23 ♗xh6 and Black's pieces are cut off from any defensive action. If Black plays 23...♔h7 we sac the ♗ with 24 ♘h4 ♔xh6 25 ♘f5+ and the ♔ is doomed. Or something like that. Let's look and see. -----
Almost close. |
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| Dec-21-07 | | zooter: <Sailfish: i don't really see the entire checkmate... i am seeing that Black could go 29... Qe7 and then get out of the situation with simply an exchange of queens and maybe losing 1 pawn also. could someone explain how this is mate? Sorry i'm a novice :)> 29...Qe7 30.Nh7+ loses the queen after 30...Ke8 31.ef7+ |
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| Dec-21-07 | | sataranj: ask u guys one thing. have u played the software netchess 6.02? if u have, can u beat it with time limit for the computer put at 2 secs? |
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| Dec-21-07 | | Cibator: One of those positions where the initial sac is fairly obvious, but the follow-up, as someone remarked, depends on how the opponent replies. It isn't possible to calculate everything out to the end. All you can do is check out as many sample variations as time permits and then form a judgement based on those and your (ha ha) grandmasterly instincts. |
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| Dec-21-07 | | Steve Case: That bishop sacrifice is one of my favorite goals. Especially if you can get the Queen behind it. Black refused to take the bishop? Fine, take down two pawns with it. Blowing those two pawns away exposing the the King is certainly worth a bishop. |
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| Dec-21-07 | | aginis: I didn't see the line played but when i looked at the board i saw the B sack as immediately sound because
22.Bxh6 gxh6?? 23.Qd2 (perhaps not as good as Nf6+ followed by Nh4 but easier to spot and analyze)
Now if black protects the N then 24.Qxh6 followed by 25.Nf6 is an easy win for white if on the other hand black protects h6 (e.g. Qf8 or Kh7) then 24.Nf6+ ... 25.Nxe8 Rxe8 26.Qxa5 leaves white with a huge advantage. Further i don't see a better line for white after 22.Bxh6 gxf6 23.Nf6+ Kh8 24.Qd2 Qf8 which essentially transposes to my line. |
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Dec-21-07
 | | pittpanther: zooter: <Sailfish: i don't really see the entire checkmate... i am seeing that Black could go 29... Qe7 and then get out of the situation with simply an exchange of queens and maybe losing 1 pawn also. could someone explain how this is mate? Sorry i'm a novice :)> <29...Qe7 30.Nh7+ loses the queen after 30...Ke8 31.ef7+ > No, 31 ...ef7+ does not lose the queen but it also does not win. After 29...Qe7 30 Qh6! is devastating. It threatens 31. Qh8 mate and if black plays 30...Kg8 then 31. ef7+ is crushing. If black moves his queen from e7 then white can win by playing 30. ef7 and then mating with Qh8. |
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| Dec-21-07 | | patzer2: <pittpanther> <29...Qe7 30.Nh7+ loses the queen after 30...Ke8 31.ef7+ > <No, 31 ...ef7+ does not lose the queen but it also does not win.> Here's the position after 29...Qe7 30. Kh7+ Ke8 31. exf7+: 
click for larger view[Problem: Black to move. Can you find White's mate(s) in three?] |
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| Dec-21-07 | | newton296: if you got this, it's evidence that your playing way to much chess. I could only get Bxh6 thenNf6+ forking K and rook better is Bxh6 followed by Qd2 double attacking h6 and the loose a5 knight . black cant allow Qxh6 so the knight is cooked. |
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| Dec-21-07 | | xrt999: <whitebeach: Well, Bxh6 of course. I didn't see 22 . . . c5, and I bet most others won't see it either, not because it's subtle or good but because it accomplishes nothing> good point, considering the c pawn is still sitting on c5 at the end of the game. CM says the best move is 22...gxh6 at a depth of 8 moves. This leads to a 1 pawn material advantage and an overall score of +2.12 |
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| Dec-21-07 | | Funicular: I feel totally represented by cibator's words. Totally. I didn't expect c5 either, but of course i saw Nf6+ and the seemingly obvious Bxh6. I thought black would accept the sacrifice. I made a quick analysis of Qc1, and a possible sacrifice of the knight on f3, exchanging for a pawn just to bring the queen to check on g5, h6, etc...and then checkmate (considering the other knight is on f6) I didn't think of possible black replies but i think there's no defense. also white can eventually afford 2 tempi to bring king's rook into action |
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Kibitzing
sac: 23.Bxg7