Author: Joshua Lee
Date: 20:49:34 10/25/02
I was looking at this position for 9+ hours and can't find a clear win for white: Best Move? Bxh6 [D] r3r1k1/pp1bbpp1/2n1pn1p/q7/3P3Q/P1NB1N2/1P3PPP/R1BR2K1 w - - 0 1 Analysis by Fritz 7: 1.Qg3 Nh5 2.Qh3 Nf6 3.Be3 Qb6 4.b4 ² (0.44) Depth: 7/24 00:00:00 197kN 1.Qg3 Nh5 2.Qh3 Nf6 3.Be3 Qb6 4.Rab1 Rac8 = (0.25) Depth: 8/20 00:00:00 240kN 1.Be3! ² (0.28) Depth: 8/24 00:00:00 364kN 1.Ne4! ² (0.31) Depth: 8/24 00:00:01 687kN 1.Ne4! ² (0.47) Depth: 8/24 00:00:02 914kN 1.Ne4 Qb6 2.Nxf6+ Bxf6 3.Qe4 Kf8 4.Qh7 Qb3 ² (0.53) Depth: 8/24 00:00:02 1127kN 1.Ne4 Rad8 2.b4 Qd5 3.Bxh6 Nxe4 4.Qg4 Ng5 5.Bxg5 Bxg5 6.Nxg5 Nxd4 ² (0.28) Depth: 9/26 00:00:04 2062kN 1.Be3! ² (0.31) Depth: 9/29 00:00:05 2451kN 1.Be3! ² (0.47) Depth: 9/29 00:00:06 3102kN 1.Be3 Rac8 2.b4 Qc7 3.Rac1 a6 4.b5 axb5 5.Nxb5 Qa5 6.Bf4 ² (0.41) Depth: 10/28 00:00:09 4414kN 1.Ne4! ² (0.44) Depth: 10/28 00:00:13 6378kN 1.Ne4 Nd5 2.Qh5 Nf6 3.Nxf6+ Bxf6 4.Qg4 h5 5.Qe4 g6 6.Qf4 Qa4 ² (0.34) Depth: 11/30 00:00:24 11684kN 1.Be3! ² (0.38) Depth: 11/30 00:00:29 14114kN 1.Be3 Rac8 2.Rdc1 Qc7 3.Nb5 Qb8 4.Bf4 Nd5 5.Bxb8 Bxh4 6.Bxa7 Nxa7 ² (0.41) Depth: 11/30 00:00:34 16654kN 1.Be3 e5 2.dxe5 Ng4 3.Qg3 Ncxe5 4.b4 Nxf3+ 5.Qxf3 Qe5 6.Bf4 Bc6 7.Qxg4 ² (0.44) Depth: 12/33 00:01:15 37183kN 1.Be3 Rac8 2.b4 Qc7 3.Rac1 a6 4.Bf4 Qd8 5.Ne5 Nxe5 6.Bxe5 a5 7.Ne4 Nxe4 ² (0.44) Depth: 13/34 00:02:27 74964kN 1.Be3 Rac8 2.b4 Qc7 3.Rac1 a6 4.Bf4 Qd8 5.Qg3 Nh5 6.Qg4 Nxf4 ² (0.44) Depth: 14/36 00:04:52 149207kN 1.Be3 Rac8 2.b4 Qh5 3.Qxh5 Nxh5 4.d5 exd5 5.b5 Nb4 6.axb4 Rxc3 7.Rxa7 Bc8 ² (0.44) Depth: 15/41 00:11:42 368616kN 1.Be3 Rac8 2.b4 Qh5 3.Qxh5 Nxh5 4.d5 exd5 5.b5 Nb4 6.axb4 Rxc3 7.Rxa7 Bc8 ² (0.53) Depth: 16/41 00:42:16 1333804kN 1.Be3 Rac8 2.b4 Qh5 3.Qxh5 Nxh5 4.Ne4 Nf6 5.b5 Nxe4 6.Bxe4 Na5 7.Rdb1 Red8 ² (0.47) Depth: 17/43 01:42:53 3320550kN 1.Be3 Qh5 2.Qxh5 Nxh5 3.d5 exd5 4.Nxd5 Bd8 5.Rac1 a6 6.h3 Rc8 7.Bc2 Be6 ² (0.44) Depth: 18/46 05:21:41 10425825kN (Lee, Kingpawn 25.10.2002) After Bxh6 gxh6: [D] r3r1k1/pp1bbp2/2n1pn1p/q7/3P3Q/P1NB1N2/1P3PPP/R2R2K1 w - - 0 1 Analysis by Fritz 7: 1. = (0.00): 2.d5 exd5 3.Qxh6 d4 4.Nb5 Bd8 5.Qg5+ Kf8 6.Qh6+ Kg8 7.Qg5+ Kf8 8.Qh6+ Kg8 9.Qg5+ 2. µ (-0.78): 2.Nb5 Nh7 3.Qxh6 Nf8 4.Ng5 f5 5.Bc4 Nd8 6.b4 Qb6 3. µ (-0.81): 2.Qg3+ Kh8 3.Ne5 4. µ (-1.03): 2.Qxh6 Qh5 3.Bh7+ Kh8 4.Qxh5 Nxh5 5.Be4 Nf6 5. µ (-1.37): 2.Ne4 Nh5 3.Qg4+ 6. -+ (-1.69): 2.Bb5 a6 3.Bxc6 Bxc6 4.Ne5 Qb6 7. -+ (-1.69): 2.Rac1 Qh5 3.Qf4 Rac8 4.b4 Qg4 5.Qxh6 Nxd4 6.Nxd4 Qxd4 8. -+ (-1.69): 2.b4 Qh5 3.Qf4 Rac8 4.Rac1 Qg4 5.Qxh6 Nxd4 6.Nxd4 Qxd4 Best is d5 with exd5 being much better than Nxd5 as was played in the game Gipslis - Puschkeit ; Berliner Sommer, 1995 Which brings us to... [D] r3r1k1/pp1bbp2/2n2n1p/q2p4/7Q/P1NB1N2/1P3PPP/R2R2K1 w - - 0 1 Analysis by Fritz 7: 1. = (0.00): 3.Qxh6 d4 4.Nb5 Qb6 5.Qg5+ Kh8 6.Qh6+ Kg8 7.Qg5+ Kh8 8.Qh6+ Kg8 9.Qg5+ Kh8 10.Qh6+ 2. -+ (-1.62): 3.b4 Qb6 4.Qxh6 Qxf2+ 5.Kxf2 Ng4+ 6.Kf1 Nxh6 7.b5 Nd8 8.Nxd5 3. -+ (-2.06): 3.h3 d4 4.Nb5 Bf5 5.Qg3+ Kh8 6.b4 Qa4 7.Nfxd4 Nxd4 8.Nxd4 4. -+ (-2.31): 3.Rac1 Ng4 4.Qg3 Bc5 5.Rc2 Nd4 6.Nxd4 Bxd4 7.b4 Qxa3 8.Nxd5 5. -+ (-2.44): 3.Qg3+ Kh8 4.Qf4 Kg7 5.Qg3+ Kh8 6.Qf4 Kg7 7.Qg3+ Kh8 8.Qf4 Kg7 9.Qg3+ Kh8 10.Qf4 6. -+ (-2.44): 3.Qf4 Kg7 4.Qg3+ Kh8 5.Qf4 Kg7 6.Qg3+ Kh8 7.Qf4 Kg7 8.Qg3+ Kh8 9.Qf4 Kg7 10.Qg3+ 7. -+ (-2.44): 3.Kf1 Ng4 4.Qg3 d4 5.Nb5 Rac8 6.Nfxd4 Nxd4 8. -+ (-2.50): 3.Bc2 d4 4.Qg3+ Kf8 5.Nxd4 Qg5 6.Qxg5 hxg5 7.Nxc6 Bxc6 8.Rac1 After 3.Qxh6 d4 4.Nb5 Nd8 is clearly better than the other options [D] r3r1k1/pp1bbp2/2n2n1Q/qN6/3p4/P2B1N2/1P3PPP/R2R2K1 b - - 0 1 Analysis by Fritz 7: 1. ² (0.47): 4...Nd8 5.Qg5+ Kh8 6.Re1 Bxb5 7.Nxd4 Qc7 8.Nxb5 Qc6 9.Re3 2. ± (0.72): 4...Be6 5.Ng5 Bf8 6.Qxf6 Bg7 7.Qf4 Bb3 8.Nd6 Be5 9.Qg4 Bxd1 10.Rxd1 Bxd6 3. ± (0.94): 4...Bf5 5.Qg5+ Bg6 6.Bxg6 fxg6 7.Qxg6+ Kh8 8.Ng5 Ne5 9.Qh6+ Kg8 10.f4 Qxb5 11.fxe5 4. +- (2.22): 4...Qd8 5.Ng5 Rf8 6.Re1 Bg4 7.Bh7+ Kh8 8.Rxe7 Qxe7 9.Bf5+ Kg8 5. +- (1.69): 4...Bf8 5.Qxf6 Bg7 6.Qh4 Re6 7.Qg3 Rh6 8.Rac1 Qb6 9.Re1 Rc8 6. +- (1.72): 4...Qb6 5.Ng5 Rf8 6.Bh7+ Kh8 7.Bg6+ Kg8 8.Nd6 Ne5 9.Bxf7+ Rxf7 10.Ndxf7 Nf3+ 11.gxf3 7. +- (2.12): 4...Rf8 5.Re1 Qb6 6.Ng5 Bf5 7.Bxf5 Qc5 8.Bh7+ Kh8 9.Bd3+ Kg8 10.Rac1 Qd5 8. +- (2.37): 4...Rac8 5.Ng5 Rf8 6.Bh7+ Kh8 7.Bg6+ Kg8 8.Nd6 Ne5 9.Bxf7+ Rxf7 10.Ndxf7 For move 5 White has Qg5+, Ne5, or Re1 with many different branches. If anyone else has looked at this or will look at this with faster hardware please let me know if there's a better score.
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