Author: Albert Silver
Date: 07:40:05 12/27/05
Rybka's 21-move miniature against Jonny was all the more interesting because of two spectacular moves. Can your engines find them? [D]2k3nr/1ppr1qpp/p4p2/3P3b/1b6/4BN1P/PP1N1PP1/2RQR1K1 w - - 0 16 16.Nc4 deserves multiple exclamation points, especially due to the follow-up expected next move. I give Rybka VP 32-bit's analysis running on an Athlon 3500+ Venice (512 MB hash) here in contrast: Analysis by Rybka 1.01 Preview 2 32-bit: 16.Qb3 Bxf3 17.Qxb4 Bxd5 18.Bf4 Nh6 19.Nc4 ² (0.48) Depth: 10 00:00:03 460kN 16.Nc4 Bxe1 17.Nb6+ Kb8 18.Nxd7+ Qxd7 19.Qd4 b6 20.Nxe1 Ne7 ² (0.61) Depth: 10 00:00:05 786kN 16.Nc4 Bxe1 17.Nb6+ Kd8 18.Nxd7 Qxd7 19.Qxe1 Bxf3 20.gxf3 Ne7 21.d6 ² (0.52) Depth: 11 00:00:07 1199kN 16.Nc4 Bxe1 17.Nb6+ Kd8 18.Nxd7 Qxd7 19.Qxe1 Bxf3 20.gxf3 Ne7 21.d6 Nc6 = (0.20) Depth: 12 00:00:16 2588kN 16.Qb3 Bxf3 17.Qxb4 Bxd5 18.Qb6 Kd8 19.Qa7 Ne7 20.Bf4 ± (1.26) Depth: 12 00:00:24 3914kN 16.Qb3 Bxf3 17.Qxb4 Bxd5 18.Qb6 Kd8 19.Qa7 Ne7 20.Bf4 Nc8 ± (1.19) Depth: 13 00:00:31 4968kN 16.Qb3 Bxf3 17.Qxb4 Bxd5 18.Qb6 Kd8 19.Qa7 Ne7 20.Bf4 Nc8 21.Qb8 c6 ± (1.10) Depth: 14 00:00:46 7296kN 16.Qb3 Bxf3 17.Qxb4 Bxd5 18.Qb6 Kd8 19.Qa7 Ne7 20.Bf4 Nc8 21.Qb8 g5 ± (1.25) Depth: 15 00:01:26 13585kN 16.Qb3 Bxf3 17.Qxb4 Bxd5 18.Qb6 Ne7 19.Qa7 b5 20.Qxa6+ Bb7 21.Qxb5 Qxa2 22.Nc4 Bc6 ± (1.25) Depth: 16 00:02:41 26031kN 16.Qb3 Bxf3 17.Qxb4 Bxd5 18.Qb6 Ne7 19.Qa7 b5 20.Qxa6+ Bb7 21.Qxb5 Qd5 22.Qxd5 Bxd5 ± (1.36) Depth: 17 00:06:23 63726kN 16.Qb3 Bxf3 17.Qxb4 Bxd5 18.Qb6 Ne7 19.Qa7 b5 20.Qxa6+ Bb7 21.Qxb5 Qd5 22.Qxd5 Bxd5 ± (1.12) Depth: 18 00:12:48 129472kN 16.Nc4 Bxe1 +- (2.07) Depth: 18 00:42:53 407226kN Although hardware *and* running Rybka 64-bit obviously helped play a role, 42 minutes is a lot, and my computer isn't THAT slow, so I wonder which Rybka personality is being used. The SP setting, one that has caught Vasik's attention yields: Analysis by Rybka 1.01 Preview 2 32-bit: 16.Qa4 Bxf3 17.Qxb4 Bxd5 18.Qc5 b5 19.a4 Qg6 20.f3 ± (1.17) Depth: 12 00:00:12 2104kN 16.Qa4 Bxf3 17.Qxb4 Bxd5 18.Qc5 b5 19.a4 Nh6 20.axb5 axb5 21.Qxb5 Qg6 ± (1.23) Depth: 13 00:00:26 4427kN 16.Qa4 Bxf3 17.Qxb4 Bxd5 18.Qc5 b5 19.a4 Nh6 20.axb5 axb5 21.Qxb5 Qg6 22.f3 ± (1.16) Depth: 14 00:00:50 8652kN 16.Qa4 Bxf3 17.Qxb4 Bxd5 18.Qc5 b5 19.a4 bxa4 20.Nc4 Bxc4 21.Rxc4 Qd5 22.Qf8+ Rd8 ± (1.21) Depth: 15 00:01:42 17912kN 16.Nc4 Bxe1 17.d6 Ba5 18.Nxa5 Ne7 19.Qd4 Bxf3 20.gxf3 Nd5 21.Qa7 Rxd6 22.Nxb7 +- (1.64) Depth: 15 00:06:57 75037kN 16.Nc4 Bxe1 17.d6 Ba5 18.Nxa5 Ne7 19.Qd4 Bxf3 20.gxf3 Nd5 21.Qa7 Rxd6 22.Nxb7 Kd7 +- (1.71) Depth: 16 00:09:05 96915kN Jonny took the rook (not that there weren't any better choices) [D]2k3nr/1ppr1qpp/p4p2/3P3b/2N5/4BN1P/PP3PP1/2RQb1K1 w - - 0 17 Analysis by Rybka VP 1.01 Preview 2 32-bit: 17.Nb6+ Kd8 18.Nxd7 Qxd7 19.Qxe1 Bxf3 20.gxf3 Ne7 21.d6 Nc6 = (0.20) Depth: 10 00:00:02 427kN 17.Nb6+ Kd8 18.Nxd7 Qxd7 19.Qxe1 Bxf3 20.gxf3 Ne7 21.d6 Nc6 22.dxc7+ Kxc7 23.Bf4+ Kc8 = (0.23) Depth: 11 00:00:06 1147kN 17.d6 Ba5 18.Nxa5 Ne7 19.Qd4 Bxf3 20.gxf3 Qg6+ 21.Kh2 f5 ± (1.35) Depth: 11 00:00:13 2228kN 17.d6 Ba5 18.Nxa5 Qxa2 19.Nc4 c6 20.Qd5 Bf7 21.Nb6+ Kd8 +- (2.02) Depth: 12 00:00:29 5070kN 17.d6 c6 18.Qd4 Kd8 19.Rxe1 Ke8 20.g4 Bg6 21.Nb6 Kf8 +- (2.19) Depth: 13 00:00:59 10044kN
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