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| Feb-06-09 | | Karnatakiaditya: Got it! Very nice attack by white |
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| Feb-06-09 | | bluenile: I like Qh3, it seems faster to win..what u think guys? |
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Feb-06-09
 | | cu8sfan: What happens after 26...♔xf8? Do you have to satisfy yourself with having won the exchange? |
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| Feb-06-09 | | EdwardT: Would 20 Nxe6 work or no? |
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| Feb-06-09 | | whitebeach: What a weird position, even for a Stonewall: all 16 pawns still on the board, and all the bishops gone. |
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| Feb-06-09 | | Eduardo Leon: I thought of 20. Nxe6 and 20. ... Rxe6? obviously loses to 21. Rxg7+ Kh8 22. Rg8+ Rxg8 23. Nf7#, but then didn't find anything against 20. ... Nxe5. Then I saw 20. Qh3 g6 21. Nxh7 with a similar idea: 21. ... Rxh7 22. Rxg6+, with the same mate. However, black can play 20. ... Nxg5. Since I'm too lazy to think any further, I give up. |
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| Feb-06-09 | | abstraction: OTB I would have played 20. Nxh7 without hesitation and without working out concrete lines : the 'look' of the position instantly demands it. It's the next move that required some thought -- whether to bring the Queen over to the h-file immediately or play the text. |
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| Feb-06-09 | | bluenile: im new here..my line..i dont know if i missed something..20. Qh3 (a)...h6 21. Qxh6 gxh6 22. Nf7 Kh7 23. Rg7 mate (b)...g6 21. Nxh7 Rxh7 22. Rxg6 and wins |
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| Feb-06-09 | | zooter: Initially I thought
20.Nxe6 Nxf2+ 21.Rxf2 Rxe6 22.Rfg2 looks promising for white But what I think is better is
20.Nxh7 Kxh7 21.Qh3+ Kg8 22.Ng6 (threatening Qh8#) Kf7 (what else?) 23.Qh5 and black is in deep trouble though I'm not able to see till the end... time to check |
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| Feb-06-09 | | whitebeach: The trouble with an immediate 20. Qh3 is 20 . . . Nxg5, when it's not at all clear what white can accomplish despite the doubled rooks. In fact I can't see why black didn't play Nxg5 on his previous move, instead of Nd7. Maybe he was proud of his N's position on e4, but as the game continuation shows, he really needed to kill that white N on g5. |
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| Feb-06-09 | | whitebeach: <cu8sfan: What happens after 26...xf8? Do you have to satisfy yourself with having won the exchange?> The exchange and at least one pawn, an outside passer at that, ought to be plenty in this endgame, don't you think? You or I could win against Anand with that advantage. |
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| Feb-06-09 | | ChessEscudero: <cu8sfan: What happens after 26...xf8? Do you have to satisfy yourself with having won the exchange?> 26 ...Kd7 27. Rxe7+ Qxe7 28. Rg7 |
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| Feb-06-09 | | karoaper: I thought initially that there's also 21. Qh3+ Kg8 22. Qh6
But black has a nice move 22 .. Nxf2+, distracting the white rook, giving black the chance to play 23 ... Rf6. 24. Rg6 This results in
click for larger viewand white missed the attack
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| Feb-06-09 | | karoaper: I see zooter already gave a similar thing |
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| Feb-06-09 | | onesax: I saw Nxh7 after rejecting both 20. Nxe6 Nxf2!+ and 20. Qh3 Nxg5, and not bothering to try other moves like 20. f3 or 20. Nxe4 to get rid of that pesky e4 knight, because I couldn't see them leading anywhere.
My line was:
20. Nxh7 Kxh7 21. Qh3+ Kg8 22. Ng6 and if 22. ... Kf7 23. Qh5 looks crushing. I didn't quite see it all the way through to the end, nor did I see that after white plays Qh8+ Kf7 that Ne5+? is met by Nxe5 :( but I'm quite sure that OTB I would've played it, and worked most of it out as I went along ... or at least thought about it for more than 2 minutes and found the right line anyways. |
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| Feb-06-09 | | patzer2: For today's difficult Friday puzzle solution, White initiates a deep demolition combination with 20. Nxh7!! Here's my computer checked breakout:
<20. Nxh7!! Kxh7 21. Ng6 Qd8> If 21... a4, White wins after 22. Qh3+ Kg8 23. Nxe7+  . If 21... Rff7, White mates with 22. Qh3+ Kg8 23. Qh8#. If 21... Ree8, White wins after 22. Nxf8+ Kg8 23. Ng6 . If 21... Rfe8, White mates following 22. Qh3+ Kg8 23. Qh8+ Kf7 24. Ne5+ Nxe5 25. Qxg7#. <22. Qh3+ Kg8 23. Qh8+ Kf7 24. Nxf8> Nxf8> If 24... Qxf8, White wins after 25. Rxg7+ Ke8 (25... Qxg7 26. Rxg7+ Kf6 27. Qh6#) 26. Rxe7+ Kxe7 27. Qh7+ Kd8 (27... Qf7 28. Rg7 ; 27... Kf6 28. Rg6#) 28. Rg8 . <25. Rxg7+ Ke8 26. Qxf8+> 1-0 Black resigns in lieu of 26...Kxf8 (26... Kd7 27. Rxe7+ Qxe7 28. Rg7!
) 27. Rg8+ Kf7 28. Rxd8 (not 28. R1g7+? Kf6 29. Rg6+ Kf7 30. R6g7+ Kf6 31. Rg6+ Kf7 32. R6g7+ =) 28... Nxf2+ 29. Kg2 Ne4 30. Rc8 . |
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| Feb-06-09 | | BraveUlysses: BraveUlysses: <bluenile: I like Qh3, it seems faster to win..what u think guys?>
20... g6 and white is going nowhere.
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| Feb-06-09 | | patzer2: I'll confess 20. Qh3 was my initial guess. However, even though it's my computer engine's second best move, it's not a clear win after 20...Nxg5 21. Rxg5  (+0.59 @ 15 depth). |
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| Feb-06-09 | | Once: 
click for larger viewThis demonstrates that a pawn weakness can also be a strength. If everything else was equal, we would prefer black's castled king position. White has doubled f pawns and an isolated h pawn. If we ever get to an endgame, white could be in trouble. But doubled pawns nearly always means that there is an open or half open file next door. And that is just what rooks love. Add some rooks and black's position suddenly doesn't look so good: 
click for larger viewBut we need to move quickly or black will consolidate with moves like g6, blunting the doubled white rooks. The other tempting thing about the second diagram is that the two black rooks stand on the same colour squares. This normally indicates the possibility of a knight fork - in this case on g6 (which also has the side benefit of nailing g6 down. So how can we get rid of the h6 pawn to allow us to play Ng6? ... |
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| Feb-06-09 | | dzechiel: White to move (20?). Material even. "Difficult."
An interesting position in that all the bishops are missing from the board, but nothing else. The location of the white queen is notable. It seems the only way to activate that piece is along the third rank. Since we would like to do that witch check, it seems the key move might be: 20 Nxh7
If black doesn't capture the knight with the king, then he is forced to play 20...Rfe8 or 20...Rd8, taking material away from the king's defence just as the attack is getting underway. So, I expect black to play... 20...Kxh7 21 Qh3+ Kg8
The weak square for black has to be g7. White needs to apply pressure to that square. 22 Qh6
The threat now is 23 Rxg7+ Rxg7 24 Rxg7#. How does black defend? The knights are useless. 22...Rff7
Not 22...g5 23 Rxg5+ Nxg5 24 Rxg5+ Rg7 25 Rxg7#.
Black now has enough defenders of g7, however white can remove one right away. 23 Nxf7
Threatening 24 Qxg7#.
23...Kxf7
On 23...Rxf7 24 Rxg7+ Kf8 25 Rxf7+ Kxf7 26 Rg7+ Ke8 27 Rg8+ Nf8 28 Rxf8+ Kxf8 29 Qh8+ Ke7 30 Qxc8 and black is down a queen for a knight. 24 Rxg7+ Ke8 25 Rg8+ Nf8 26 Rxf8+ Kxf8 27 Qh8+ Kf7 28 Qxc8 and once again white is up a queen for a knight.
Time to check.
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I see why my line doesn't work. Black can interpose 22...Nxf2+ forcing the white rook off of the g-file. <sigh> This did seem too easy. |
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| Feb-06-09 | | leow: I had 1 Ng6 winning at least the exchange |
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| Feb-06-09 | | newzild: " leow: I had 1 Ng6 winning at least the exchange"
1.Ng6 hg 2.Qh3 Nxg5 doesn't give white enough for the piece. |
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| Feb-06-09 | | Chris1Clark: Had my eye on 1.Ng6 hxg6 2.Qh3 someone put me right why this doesn't work. As mate follows with Qh7 Qh8. |
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| Feb-06-09 | | HelaNubo: <dzechiel: I see why my line doesn't work. Black can interpose 22...Nxf2+ forcing the white rook off of the g-file. <sigh> This did seem too easy.>
It seems that 22. Qh6! works anyway and according to Fritz it is even superior to 22. Ng6 (1.99 vs 1.71 at 17 plies, and difference growing). It runs this way: 22. Qh6 Nxf2+ 23. Rxf2 Nxe5 24. fxe5 f4 25. Rfg2 Rff7 26. Rg4 and the threat Rh4 is unstoppable:
click for larger view
Your instinct was superior to any analysis;-) |
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| Feb-06-09 | | MagisterMusicae: 21. Ng6! is a great move. I saw 21.Qh3+, but 21.Ng6! first... beautiful move! |
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Kibitzing
sac: 20.Nxh7