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Mar0810
  e4ia: I think Nisi got away with one at 18...when the correct Kxf7! was not played! Qd7?? is a total lemon to the brilliant 19.Be3 he found! A friend of mine with "quick" Fritz 12 line he gave me over the phone and black is better and about 1.5 as I recall in the "popular" 19.Bg5 continuation given in discussion on ICC (18... Kxf7 19. Bg5 Re7 20. Qh7+ Bg7 21. Bf6 Qf8 22. Ng5+ Kxf6 23. Qh4 Nd5!)
But in fact, 19. Bg5 was not even the best white continuation! It's really 19 Qf3+ and best W can do is = apparently...
but I don't have that line.
So, "Gentlemen, start your engines"! to those here with Rybka/Fritz etc on 18...Kxf7! I'm curious to know! 

Mar0810   virginmind: yes, at 19 ply fritz 11 gives 0.00 to 18...Kxf7
Nisipeanu,L  Reinderman,D, 11th European Individual Men Chess Cham 2010
click for larger viewAnalysis by Fritz 11:
1. = (0.00): 18...Kxf7 19.Qf3+ Bf6 20.Bg5 Nd7 21.Qh3 Bxg5 22.Qh7+ Kf8 23.Qh8+ Kf7 24.Qh7+ 

Mar0810   notyetagm: Game Collection: Queen traps: when your Lady gets checkmated http://www.thechessmind.net/storage... <30.Qh6! Do you see White's threat? 30...Nd5 31.g4 [31.g4 leaves the queen only one square, but it's not so safe either: 31...Qf4 32.Ng6+ ] 10> 

Mar0910
  Tabanus: After 18...Kxf7 19.Qf3+, Rybka 2.3.2a 24ply:
1. ² (0.57): 19...Bf6 20.Re1 Nd5 21.Ng5+ Kg8 22.Qe4 Nf4 23.Qxf4 Bxg5 24.Bxg5 Qxd3 25.Qxc7 Qf5 26.Be3 2. ² (0.57): 19...Kg8 20.Qg4 Kf7 21.Re1 Bf6 22.Qf3 Nd5 23.Ng5+ Kg8 24.Qe4 Nf4 25.Qxf4 Bxg5 26.Bxg5 

Mar1010
  e4ia: Thanks < Tabanus> and <virginmind>
your responses in the 18...Kxf7 line!
A very rich game! 

Oct1914   patzer2: My pick for today's Sunday puzzle (19?) was 19. Neg5! which Fritz 12 indicates wins after 19. Neg5 Qe7 20. Qg3 Nd5 21. Re1 Nf6 22. Qf4 Qc5 23. Re2 Nh5 24. Qe4 Bg7 25. Bxg7 Kxg7 26. Rc2 Qe7 27. g4 Nf6 28. Qe5 Bd7 29. Rxc7 Rac8 30. Rxd7 Qxd7 31. Nd6 Rf8 32. Nxc8
Qxc8 33. Nxe6+ .
Of course the game continuation 19. Be3!! is more direct and much stronger. 

Oct1914
  al wazir: My move was 19. Neg5. I don't have a lot of confidence in my analysis, but here it is: 19...Bf6 20. Bf8 Bxg5 (20...Rxf8 21. Qh7#) 21. Qh8+ Kxf7 22. Qg7#. Black's best might be 20...Qxf7 21. Nxf7 Kxf8, with ♖+♗ vs. ♕. Or 19...Re7 20. Re1 Bxf2+ 21. Kxf2 Rxf7+ 22. Nxf7 Qxf7+ 23. Kg1 Nd5. Material is even but black's position is precarious and he probably can't hold the ♙ on e6. 

Oct1914   plumbst: Insane. White is down an exchange. White's Knight is under attack. Definitely tough, wasted a lot of time on the typical "sacrificial" type moves, but none seem to work. However, after seeing the importance of the d4 Bishop one idea came to mind. 19.Be3! An unexpected retreat, but it attacks the important defensive bishop and clears the way for Nh6+. 19...Bxe3 20.Qh8+ Kxf7 21.fxe3+ Ke7 22.Qf6#
19...Qxf7 20.Bxd4 Kf8 21.Ng5 looks devastating
19...Bg7 20.Nh6+ Kh8 (20...Bxh6 21.Nf6+; 20...Kf8 21.Qf3+ Ke7 22.Bg5+) 21.Ng4+ Kg8 22.Ngf6+ 19...Bb2 20.Nh6+ Kg7 (20...Kf8 21.Bc5+) 21.Ng4 and I don't see a defense to Qh6+ So after
19...Kxf7.
20.Qh7+ Bg7
(20...Kf8 21.Bh6+ Bg7 22.Qh8+)
21.Ng5+ Kf6
(21...Kf8 22.Bc5+; 21...Ke7 21.Qxg7+ mates after 22...Kd8 23.Nf7+ or 22...Kd6 23.Ne4+) 22.Nf3! (threatening Bg5+) Qd6
(22...Qb5 23.Bd4+; 22...Qf7+ 23.Qh4+ mates)
23.Bg5+ Kf7
24.Bh6 Qf8 (24...Rg8 25.Ng5+ Kf8 26.Qxg6)
25.Ne5+ Kf6
26.Re1 Bxh6
27.Ng4+ Kg5 (27...Kg5 28.Re5+ is the same)
28.Re5+ Kf4 (other moves get mated as well)
29.Bd1! and White mates.
Not sure if Black can return material favorably in any lines, but at least the first few moves SHOULD be it...maybe 20.Ng5+ was a possibility too 

Oct1914   plumbst: Yes.. I guess eliminating all the wrong moves helped me find the winning line. But over the board I would've played Neg5 or Nfg5 for sure... the main line is really complex 

Oct1914   morfishine: I had <19.Be3> as White's best but couldn't
find a win after 19...Qxf7 20.Bxd4 Kf8
Visually, its difficult to corral the Black King Perhaps the follow up moveorder is best: 21.Qh6+ Ke7 22.Bf6+ Kd7 23.Qg5 ***** 

Oct1914   diagonalley: i didn't really have a clue about this one (as is usually the case on sundays) but i was intrigued to discover how the position had arisen... crazy! 

Oct1914   weary willy: Tuesday puzzle? 31? 

Oct1914   JG27Pyth: Well, I got as far as looking at Be3 and thinking... now there's an interesting idea! I'll bet a good player would be able to tell if it was playable. Double black diamond terrain and you need your avalanche snorkle. 

Oct1914   JG27Pyth: @<weary willy>
I agree 31 is an excellent puzzle. Maybe wednesday and it would frustrate A LOT of us. Anyone's first thought looking at that position as a puzzle is  mating net. The Q trap with a pawn from the king's wall! That doesn't require great calculation, but excellent board vision and a nimble imagination. 

Oct1914
  paulalbert: Be3 to try to lure the black B away from covering the long dark diagonal ( but he cannot be lured ) was the obvious candidate move, so let's see what I've got ( if anything) on 19.... Kxf7 20. Qh7+ ? That the ultimate objective was trapping black's Q by another N fork on g5 rather than f6 was way beyond my calculating vision! 

Oct1914
  paulalbert: Correction: g6 

Oct1914   Cheapo by the Dozen: White is down the exchange. His f7 knight is hanging and Black's e6 pawn looks like a weakness, so the obvious thought is N(e4)g5. The second thought is that that move would look a lot better yet if the DSBs weren't on the board, or for that matter just if the h6 bishop weren't blocking Qh7. OK. My move is 19 Be3. Possible lines include:
19 Be3 Bxe3
20 Nf6+ winning the queen.
19 Be3 Kxf7
20 Ng5+ Kg8
21 Bxd4 Rd8
22 Qh8+ Kf7
23 Qg7+ Ke8
24 Qxg6+ Kf8
25 Qf6+ Kg8
26 Qh8+ Kf7
27 Qg7+ Ke8
28 Qg8+ Ke7
29 Qf7+ Kd6
and there surely is a win for White in there somewhere. I'd happily play that over the board, recalculating on the fly as needed. 19 Be3 Kxf7
20 Ng5+ Ke7
21 Qh7+ Kd8
22 Nf7+ soon winning the queen.
19 Be3 Kxf7
20 Ng5+ Kf8
21 Qh6+
and we transpose into something resembling one of the other lines. 19 Be3 Qxf7
20 Bxd4 Kf8 (Black has little choice at this point)
21 Bc5+ Re7
22 Qh8+ Qg8
23 Bxe7+ and White has a major material advantage
19 Be3 Qxf7
20 Bxd4 Kf8
21 Bc5+ Kg8
and to be honest I don't immediately see a win, but a worstcase scenario is that Black plays this 3move response and I have to repeat moves. If this last scenario is the actual one in the game I'll try to calculate further. 

Oct1914   Cheapo by the Dozen: Hmm. I like my continuation a little better than the game one ... 

Oct1914   Cheapo by the Dozen: Hmm. I like my continuation of 20 Ng5+ a little better than the game one, but nobody else seems to have picked it ... 

Oct1914   diagonalley: <cheapo> .... woooooo ...go to the top of the class 

Oct1914   patzer2: <cheapo> For 20. Ng5+, Fritz 12 gives equality after 20. Ng5+ Kf8! 21. Qf3+ Kg7 22. Bxd4+ Qxd4 23. Qf7+ Kh6 24. Qxe8 Bd7 25. Qe7 Re8 26. Nxe6 Qxf2+ 27. Kxf2 Rxe7 28. Nxc7 Bf5 29. Rc1 Bxd3 30. Ne6 Bf5 31. Nd4 Be4 =. 

Oct1914   patzer2: Had Black seen the Queen trap coming after 29...Qf5 30. Qh6! Nd5 (or almost any other move) 31. g4! , he might have tried 29...Qg8. After 29...Qg8, White wins with 30. Rc1! when play, as verified by Fritz, might continue 30...c6 31. Bf6+ Kd6 (31... Kf8 32. Qh6+ Qg7 33. Qxg7#) 32. Nf7+ Kd7 (diagram below) click for larger viewHere Fritz gives a forced mate after 33. Bxe6+! Kxe6 (diagram below) [33... Kc7 34. Be5#; 33... Rxe6 34. Qxg8 Rxf6 (33...c5 34. d4! yields mate in 11) 35. Qd8+ Ke6 36. Qe8+ Kd5 37. Qe5#] click for larger viewFrom this position, it's mateinthree with 34. Bg7+! Ke7 (34... Kd7 35. Qd6#; 34... Kd5 35. Qd6#)
35. Qd6+ Kxf7 36. Qf6#. 

Oct1914   Cheapo by the Dozen: Thanks, <patzer2>.
My line vs. ... Kf8 overlooked the interposing retreat of ... Bg7, which may be why Fritz went in a different direction. And I'm not find anything strong enough after: 19 Ng5+ Kf8
20 Qh6+ Bg7
21 Bc5+ Re7
despite the initial appeal of moves like 22 Bxe6, 22 Nxe6+ and 22 Qxg6 

Oct1914
  Jimfromprovidence: I really liked the quiet 30 Qh6.
click for larger view Here white threatens 31 Qh4+. The idea is that black cannot respond 31...Kd6 because of 32 Qb4+, the beginning of a forced mate, so black would have to interpose and lose his queen to prevent 32 Qb4+ from occuring. 30...Nd5 protects the b4 square, but then comes the nice finish 31 g4. BTW, if 31...Qf4, then 32 Ng6+. click for larger view 

Oct1914
  agb2002: White has a knight for a rook.
Black threatens 19... Qxf7.
The first idea that comes to mind is 19.Be3, trying to eliminate or divert the best defender of the black castle: A) 19... Qxf7 20.Bxd4 Kf8 (20... Qh7 21.Nf6+ wins; 20... e5 21.Bxf7+ wins) 21.Bf6 (threatens 22.Qh6+ Kg8 23.Qh8#) 21... Re7 22.Qh8+ Qg8 23.Bxe7+ Kf7 (23... Kxe7 24.Qxg8 + ) 24.Qf6+ +  [B]. B) 19... Kxf7 20.Qh7+
B.1) 20... Kf8 21.Bh6+ Bg7 22.Qh8+ Ke7 (22... Kf7 23.Qxg7#) 23.Qxg7+ Kd8 24.Bg5+ Re7 25.Qf8+ Qe8 26.Bxe7+ Kd7 27.Nc5+ and 28.Qxe8, etc. B.2) 20... Bg7 21.Bh6 Rg8 (21... Kf8 22.Qh8+ transposes to B.1) 22.Bxe6+ B.2.a) 22... Qxe6 23.Ng5+ Kf8 24.Nxe6+ Bxe6 25.Qxg6, unclear [Q+2P vs R+B+N]. B.2.b) 22... Kxe6 23.Qxg8+ Ke5 (23... Qf7 24.Ng5+ wins; 23... Ke7 24.Bg5+ Bf6 25.Bxf6#) 24.Bxg7+ with a winning attack. C) 19... Bxe3 20.fxe3
C.1) 20... Kf8 21.Qh8+ Ke7 22.Qf6+ Kf8 23.Nh6+ Qf7 24.Qxf7#. C.2) 20... Qxf7 21.Rxf7 Kxf7 22.Qh7+ Kf8 23.Ng5 and mate next. D) 19... Bg7 20.Nh6+
D.1) 20... Bxh6 21.Qxh6 with a winning attack (21... Qh7 22.Nf6+). D.2) 20... Kh7(8) 21.Nhg4+ Kg8 22.Ngf6+ wins the queen. D.3) 20... Kf8 21.Qf3+ Ke7 22.Bg5+ Bf6 23.Qxf6#. 


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