Author: John Merlino
Date: 12:06:58 05/04/03
Go up one level in this thread
On May 04, 2003 at 10:47:05, Joachim Rang wrote: >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 The default Chessmaster 9000 personality, on a P3-733, finally settles on Nxe5, with a good score for White: Time Depth Score Positions Moves 0:00 1/4 0.78 6839 1.Qb4+ Ke8 2.Nxe5 Be6 3.Nc4 Na6 0:00 1/4 0.94 12226 1.Nxe5 Ke8 2.Qb4 Na6 3.Qa3 0:00 1/5 0.93 35727 1.Nxe5 Ke8 2.Qa4 Bxe5 3.Bxe5 Be6 0:01 1/5 1.04 49587 1.Qb4+ Ke8 2.Nxe5 f6 3.Nc4 Bh6 4.Ne3 0:01 1/6 0.90 101158 1.Qb4+ Ke8 2.Nxe5 f6 3.Nc4 Bh6 4.Nd6+ Kd8 0:02 1/6 0.94 144317 1.Nxe5 f6 2.Nf3 Nf7 3.d5 Ke8 4.dxc6 bxc6 5.Qxb8 Rxb8 6.Bxc7 Rxb2 0:05 1/7 0.94 339536 1.Nxe5 Ke8 2.Qb4 f6 3.Nc4 b5 4.Nd6+ Kd8 5.Nxc8 Kxc8 0:06 1/7 0.98 411146 1.Qb4+ Ke8 2.Nxe5 Bf6 3.Nd3 Be7 4.Bd6 Na6 0:11 1/8 1.00 850459 1.Qb4+ Ke8 2.Nxe5 Bf6 3.Nc4 Be7 4.Nd6+ Kd8 5.d5 a5 0:18 1/8 1.21 1348584 1.Nxe5 f6 2.Qb4+ Ke8 3.Nc4 Na6 4.Qa3 Nc7 5.Nd6+ Kd8 6.Qa5 0:50 1/9 1.20 3735166 1.Nxe5 f6 2.Nf3 Kd8 3.d5 Bd7 4.dxc6 bxc6 5.Qa3 Qb6 6.Qd6 2:50 1/10 1.46 12404891 1.Nxe5 f6 2.Nc4 Kd8 3.d5 Bd7 4.dxc6 bxc6 5.Rxd7+ Kxd7 6.Qd1+ Ke8 7.Nd6+ Kd8 8.Nb5+ Kc8 9.Nxc7 Qxb2 10.Nxa8 Qxa2 jm
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