Author: Mike S.
Date: 13:21:30 02/21/01
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On February 21, 2001 at 15:53:25, Uri Blass wrote: >How much time do chess program need to see that exd4 leads to a draw? >How much time do chess programs need to find 46...Kd3(Is it the only drawing >move)? From Crafty 18.01 (CB-native in the Hiarcs 7.32 GUI), on PIII/700 with 29 MB Hash, all 4-piece tablebases: New position 8/p2RP3/4r3/5pp1/2kp4/P3PK2/8/8 w - - 0 1 Analysis by Crafty 18.01: 1.exd4 Te4 2.d5 Tf4+ 3.Ke3 Te4+ 4.Kf2 Tf4+ 5.Ke2 Te4+ 6.Kd1 Txe7 7.Txe7 Kxd5 8.Txa7 g4 9.Tf7 Ke4 10.Te7+ ± (1.02) Tiefe: 1/2 00:00:00 +- (2.46) Tiefe: 15/33 00:03:28 94213kN, tb=586 Then, after restart of the program: New position 8/p2RP3/4r3/5pp1/2kP4/P4K2/8/8 b - - 0 1 Analysis by Crafty 18.01: 1...a5 ² (0.66) Tiefe: 1/2 00:00:00 1...Kd3 2.d5 Te3+ 3.Kg2 Te2+ 4.Kf1 a5 5.d6 ± (0.86) Tiefe: 5/14 00:00:00 +- (4.74) Tiefe: 6/14 00:00:00 16kN 1...Te4 2.d5 Tf4+ 3.Ke3 Te4+ 4.Kd2 Txe7 5.Txe7 Kxd5 6.Txa7 +- (4.34) Tiefe: 6/14 00:00:00 17kN +- (2.52) Tiefe: 8/16 00:00:00 162kN 1...a5 2.d5 Te4 3.d6 Kc5 4.Td8 Kc6 5.a4 g4+ 6.Kg3 +- (2.37) Tiefe: 8/16 00:00:00 267kN +- (3.23) Tiefe: 9/18 00:00:01 363kN 1...Te4 2.d5 Tf4+ 3.Ke3 Te4+ 4.Kf2 Tf4+ 5.Ke2 Te4+ 6.Kd1 Txe7 7.Txe7 Kxd5 8.Txa7 g4 9.Tf7 Ke4 10.Te7+ +- (2.83) Tiefe: 9/18 00:00:01 541kN +- (2.06) Tiefe: 15/34 00:03:35 97180kN, tb=456 ---------- So it seems to me Kd3 is quite difficult... looks like a somewhat good test position. I tried some other programs in the position after exd4, but none of them was quickly seeing a draw, or wanted to play Kd3. Regards, M.Scheidl
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