Author: Joachim Rang
Date: 07:47:05 05/04/03
Okay, there was a discussion what does give Shredder 7 an edge above other programs. I created a position to determine the influence of king safety and piece coordination: [D] rqb2r1n/ppn1kpbp/2p3p1/4p3/3PP3/1QP2NBP/BP3PP1/3RR1K1 w - - 0 1 White is a piece down, but the exposed black king and the black trapped pieces makes this a won position for white. It's all tactics, but it's no simple tactics, so most programs get a positive score for white not earlier than depth 12 or 13 - except Shredder 7: Shredder 7 starts with +2.14 at depth 1 (sic!) and never goes below + 1 for white - also the positions in which white get material back are many plies away. It seems to me that Shredder 7 evaluates king safety and piece coordination with very high values. At least here Shredder's optimism is justified. Below are some analysis of some programs on a slow 233 Mhz - Notebook: rqb2r1n/ppn1kpbp/2p3p1/4p3/3PP3/1QP2NBP/BP3PP1/3RR1K1 w - - 0 1 Analysis by Shredder 7: 1.dxe5 +- (2.14) Tiefe: 1/1 00:00:00 1.dxe5 +- (2.14) Tiefe: 1/1 00:00:00 1.dxe5 Lxh3 2.gxh3 +- (1.58) Tiefe: 2/2 00:00:00 1.dxe5 Le6 ± (1.06) Tiefe: 2/4 00:00:00 1.dxe5 Se6 ± (0.93) Tiefe: 2/4 00:00:00 1.Db4+ Kd8 2.Lxe5 ± (1.10) Tiefe: 2/7 00:00:00 1.Db4+ Kd7 2.dxe5+ Sd5 +- (1.48) Tiefe: 2/8 00:00:00 1.Db4+ Ke8 2.dxe5 +- (1.56) Tiefe: 2/10 00:00:00 1.Db4+ Ke8 2.Lxf7+ Sxf7 3.Dxf8+ Kxf8 ± (1.31) Tiefe: 3/6 00:00:00 1.Db4+ Ke8 2.Lxf7+ Sxf7 3.De7+ Kxe7 ± (0.81) Tiefe: 3/6 00:00:00 1.Db4+ Kd8 2.Sxe5 Lxh3 ± (0.85) Tiefe: 3/18 00:00:00 1.dxe5 Td8 2.Db4+ Ke8 ± (0.91) Tiefe: 3/18 00:00:00 1.dxe5 Le6 2.Db4+ Ke8 ± (1.21) Tiefe: 3/18 00:00:00 1.Lxe5 Le6 2.Db4+ Ke8 ± (1.28) Tiefe: 3/18 00:00:00 1.Lxe5 f6 2.Db4+ Ke8 +- (1.84) Tiefe: 3/18 00:00:01 1.Lxe5 f6 2.Db4+ Ke8 +- (1.84) Tiefe: 3/18 00:00:01 1.Lxe5 f6 2.Db4+ Ke8 3.Lf4 +- (1.73) Tiefe: 4/10 00:00:01 1.Lxe5 f6 2.Db4+ Ke8 3.Ld6 Sa6 +- (1.77) Tiefe: 5/14 00:00:01 1.Lxe5 Lxe5 2.dxe5 Ke8 3.Dxf7+ Sxf7 4.Lxf7+ Kxf7 +- (1.52) Tiefe: 6/14 00:00:01 1.Lxe5 Lxe5 2.Sxe5 Le6 3.Da3+ Ke8 4.c4 +- (1.44) Tiefe: 6/14 00:00:01 1.Lxe5 Lxe5 2.Sxe5 Le6 3.Da3+ Kf6 4.De7+ Kxe7 5.Sxc6+ bxc6 ± (1.19) Tiefe: 7/14 00:00:03 66kN 1.Lxe5 Lxe5 2.Sxe5 Le6 3.d5 Lg4 ± (1.19) Tiefe: 7/14 00:00:03 71kN 1.Db4+ Ke8 2.Lxe5 Le6 3.Lxg7 a6 ± (1.20) Tiefe: 7/14 00:00:03 78kN 1.Db4+ Ke8 2.Lxe5 Lxe5 3.dxe5 Se6 4.Dd6 Dxd6 ± (1.20) Tiefe: 7/23 00:00:05 132kN 1.Da3+ Ke8 2.Lxe5 Lxe5 3.dxe5 Se6 4.Lc4 Ld7 ± (1.21) Tiefe: 7/23 00:00:06 159kN 1.Da3+ Ke8 2.Lxe5 Lxe5 3.dxe5 Se6 4.Lc4 Ld7 ± (1.21) Tiefe: 7/23 00:00:07 172kN 1.Da3+ Ke8 2.Lxe5 Lxe5 3.dxe5 Le6 4.Lb1 Sb5 5.Dc5 ± (1.15) Tiefe: 8/23 00:00:14 376kN 1.Db4+ Ke8 2.Sxe5 Le6 3.Sc4 f6 4.Dd6 ± (1.16) Tiefe: 8/23 00:00:15 401kN 1.Db4+ Ke8 2.Sxe5 Le6 3.Sc4 b5 4.Sd6+ Kd8 5.Sxf7+ Lxf7 6.Lxc7+ Kxc7 7.Dd6+ Kxd6 ± (1.16) Tiefe: 8/24 00:00:18 483kN 1.Db4+ Ke8 2.Sxe5 Le6 3.Sc4 b5 4.Sd6+ Kd8 5.d5 ± (1.29) Tiefe: 9/28 00:00:34 962kN 1.Db4+ Ke8 2.Sxe5 f6 3.Sf3 Sf7 4.Lb3 Ld7 5.e5 fxe5 6.dxe5 +- (1.53) Tiefe: 10/26 00:01:06 1959kN 1.Db4+ Ke8 2.Sxe5 a5 3.Dd6 Sb5 4.Dxb8 Sxc3 5.Dxa8 Se2+ 6.Txe2 +- (1.76) Tiefe: 11/32 00:02:18 4217kN rqb2r1n/ppn1kpbp/2p3p1/4p3/3PP3/1QP2NBP/BP3PP1/3RR1K1 w - - 0 1 Analysis by Crafty 19.01: 1.dxe5 µ (-1.22) Tiefe: 1/11 00:00:01 1.dxe5 Td8 -+ (-1.48) Tiefe: 2/11 00:00:01 1.dxe5 Td8 µ (-1.08) Tiefe: 3/11 00:00:01 1.dxe5 Le6 2.Db4+ Ke8 3.Lxe6 Sxe6 µ (-1.04) Tiefe: 3/11 00:00:01 1.dxe5 Ke8 2.Dc4 Le6 µ (-1.03) Tiefe: 4/12 00:00:01 1.dxe5 Le6 2.Db4+ Ke8 3.Lxe6 Sxe6 µ (-1.04) Tiefe: 5/13 00:00:02 1.dxe5 Ke8 2.Db4 Sa6 3.Dd4 Dc7 µ (-1.06) Tiefe: 6/18 00:00:03 60kN 1.Db4+ Ke8 2.dxe5 Ld7 3.Lc4 Kd8 4.Dd6 µ (-0.85) Tiefe: 6/18 00:00:04 104kN 1.Db4+ Ke8 2.dxe5 Le6 3.Lxe6 Sxe6 4.Dd6 Dc7 µ (-1.29) Tiefe: 7/18 00:00:14 527kN 1.dxe5 Ke8 2.Dc2 Ld7 3.Dd2 Dd8 4.Lc4 µ (-0.90) Tiefe: 7/18 00:00:18 663kN 1.dxe5 Ke8 2.Dc2 Ld7 3.Sg5 Kd8 4.Dd3 Dc8 5.Sxh7 µ (-1.18) Tiefe: 8/23 00:00:26 1023kN 1.Da3+ Ke8 2.dxe5 Se6 3.Lc4 Dc7 4.Dd6 Ld7 5.Dd2 µ (-0.94) Tiefe: 8/23 00:00:44 1926kN 1.d5 Ke8 2.Sxe5 f6 3.Sc4 Ld7 4.Sd6+ Ke7 5.dxc6 Lxc6 µ (-0.91) Tiefe: 8/23 00:01:02 2655kN 1.d5 Sb5 2.dxc6 bxc6 3.Dc4 Dc7 4.Dc5+ Ke8 5.Lxe5 Lxe5 6.Sxe5 µ (-0.80) Tiefe: 9/23 00:01:31 3870kN 1.d5 Sa6 2.dxc6 bxc6 3.Da3+ Ke8 4.Lc4 Db6 5.Sxe5 f6 6.Sg4 ³ (-0.46) Tiefe: 10/24 00:03:24 9187kN 1.d5 Sb5 2.c4 Sd6 3.dxc6 f6 4.c5 Sdf7 5.cxb7 Dxb7 6.Dd5 Dxd5 7.exd5 ³ (-0.49) Tiefe: 11/28 00:08:12 22815kN 1.Sxe5 f6 2.Sd3 Kd8 3.d5 Ld7 4.Sc5 Kc8 5.Se6 Lxe6 6.dxe6 = (-0.19) Tiefe: 11/28 00:13:00 35987kN 1.Sxe5 f6 2.Sd3 Kd8 3.d5 Ld7 4.Sc5 Kc8 5.Se6 Lxe6 6.dxe6 = (0.21) Tiefe: 12/30 00:25:30 71747kN
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