Author: Jim Monaghan
Date: 13:06:49 09/13/02
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Yes, you're right, 2...Kg8! is superior to 2...Kxh6? I gave this position to Yace and it liked 3.Qd2 with a similar result to CM9000. [D] 2r1r1k1/pp1nbp2/4pn1B/q3N2P/P1pP4/2P5/1PQ2PP1/R3R1K1 w - - However, the rook lift to e3 looks pretty strong. After some coaxing and moving around the best line looks like this: 3.Re3 Nxe5 4.dxe5 Nxh5 5.Qe2 Ng7 6.Rg3 Bf8 7.Re1 and Yace thinks: 12.01 1:52 -2.40 7...Rc7 8.Rg5 Qxa4 9.Qg4 f5 10.exf6 Qc2 11.Bxg7 Qxb2 12.Bxf8+ Kxf8 13.f7 Qxc3 14.fxe8Q+ Kxe8 15.Rxe6+ Kd8 (62.833.693) 560.8 It's a bit speculative, but it appears to be best play by both sides. 4.Rxe5 was chosen first and appeared to be drawish, while 4.dxe5 cuts the board in half and seperates the BQ from the kingside. Cheers, Jim On September 13, 2002 at 15:04:33, John Merlino wrote: >On September 13, 2002 at 11:11:00, Jim Monaghan wrote: > >>Hi, >> >>[D] 2r1r1k1/pp1nbpp1/4pn1p/q3NN1P/P1pP1B2/2P5/1PQ2PP1/R3R1K1 w - - >> >>Most everyone enjoys a good king hunt, but perhaps this one is not so clear. >>There are a lot of different ways White can sac his pieces in Black's king's >>field here. The game went: >> >>[Event "Wijk aan Zee"] >>[Site "?"] >>[Date "1979"] >>[Round "-"] >>[White "Gaprindashvili"] >>[Black "Nikolac"] >>[Result "1-0"] >>[FEN "2r1r1k1/pp1nbpp1/4pn1p/q3NN1P/P1pP1B2/2P5/1PQ2PP1/R3R1K1 w - - 0 1"] >>[SetUp "1"] >> >>1. Nxg7 Kxg7 2. Bxh6+ Kxh6 3. Nxf7+ Kxh5 4. g4+ Kh4 5. f3 Nxg4 6. Re4 >>1-0 >> >>I think you may get a lot of different answers with this position depending on >>the analysis engine chosen. >> >>Cheers, >>Jim > >Analysis done with Chessmaster 9000 on a PIII-600. It does not see a sacrifice >at all, but instead plays Nxd7. The problem with the line that was played in the >game is that 2...Kxh6 is a huge blunder. 2...Kg8, on the other hand, appears to >lead to a draw: > >Time Depth Score Positions Moves >0:00 1/3 -2.41 1199 2...Kxh6 3.Nxf7+ Kxh5 4.Qe2+ Kg6 > 5.Qxe6 >0:00 1/4 -1.75 5313 2...Kxh6 3.Nxf7+ Kxh5 4.Rxe6 Bf8 > 5.Ne5 Nxe5 6.Rxf6 >0:00 1/5 -1.85 17321 2...Kxh6 3.Nxf7+ Kxh5 4.Rxe6 Bf8 > 5.Ne5 Kh4 >0:02 1/6 0.00 73190 2...Kxh6 3.Nxf7+ Kxh5 4.g4+ Kxg4 > 5.Qg6+ Kh4 6.Re4+ Nxe4 7.Qxe4+ > Kh5 8.Qh7+ Kg4 9.Qe4+ Kh5 >0:04 1/7 3.57 274068 2...Kxh6 3.Nxf7+ Kg7 4.Qg6+ Kf8 > 5.Ng5 Qxg5 6.Qxg5 Bd6 7.h6 Ke7 8.h7 >0:04 1/7 0.19 311140 2...Kg8 3.Re3 Nxe5 4.Rxe5 Nd5 5.Rxe6 > Nf6 6.Re5 >0:06 1/8 0.00 448506 2...Kg8 3.Qc1 Kh7 4.Qc2+ Kg8 >0:11 1/9 0.00 860292 2...Kg8 3.Qc1 Kh7 4.Qc2+ Kg8 >0:28 1/10 0.00 2126834 2...Kg8 3.Qc1 Kh7 4.Qc2+ Kg8 >1:24 2/11 0.00 6637293 2...Kg8 3.Qc1 Kh7 4.Qc2+ Kg8 >4:06 3/12 0.00 20927050 2...Kg8 3.Qc1 Kh7 4.Qc2+ Kg8 > >...whereas 2...Kxh6: > >Time Depth Score Positions Moves >0:00 1/3 -1.75 3150 3.Nxf7+ Kxh5 4.Rxe6 Bf8 5.Ne5 Nxe5 > 6.Rxf6 >0:00 1/4 -1.85 10110 3.Nxf7+ Kxh5 4.Rxe6 Bf8 5.Ne5 Kh4 >0:01 1/5 0.00 60561 3.Nxf7+ Kxh5 4.g4+ Kxg4 5.Qg6+ > Kh4 6.Re4+ Nxe4 7.Qxe4+ Kh5 8.Qh7+ > Kg4 9.Qe4+ Kh5 >0:05 1/6 3.45 326242 3.Nxf7+ Kg7 4.Qg6+ Kf8 5.Ng5 Qxg5 > 6.Qxg5 Bd6 7.h6 Ke7 8.h7 >0:07 1/7 3.40 552350 3.Nxf7+ Kg7 4.Qg6+ Kf8 5.Ng5 Qxg5 > 6.Qxg5 Bd6 7.h6 Re7 8.a5 e5 >0:19 1/8 4.22 1563593 3.Nxf7+ Kg7 4.Qg6+ Kf8 5.h6 Ba3 > 6.Ng5 Ke7 7.Rxe6+ Kd8 8.Rxe8+ Nxe8 > 9.h7 Nf8 10.Qh5 Rc5 11.dxc5 >0:50 1/9 4.80 4223661 3.Nxf7+ Kg7 4.Qg6+ Kf8 5.h6 Ba3 > 6.Ng5 Ke7 7.Rxe6+ Kd8 8.Nf7+ Kc7 > 9.Qg3+ Ne5 10.Rxe5 Rxe5 11.Rxa3 > Re8 12.dxe5 >3:10 1/10 6.42 16890907 3.Nxf7+ Kg7 4.Qg6+ Kf8 5.h6 Bb4 > 6.Ng5 Ke7 7.Rxe6+ Kd8 8.Rxe8+ Nxe8 > 9.h7 Rc6 10.Nf7+ Kc8 11.Nd6+ Nxd6 > 12.h8=Q+ Kc7 13.cxb4 Qxb4 > >jm
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