Author: Richard Pijl
Date: 01:52:40 05/12/03
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On May 12, 2003 at 03:34:37, Thomas McBurney wrote: >I've been working on my chess engine to recognise a drawn position in the board >evaluation routine, and here is a chess position I have come accross that I'm >not sure of the correct answer. Most chess engines think that black is winning, >but at least one chess engine I have come accross sees it as a draw. > >8/p6R/1kpb4/8/8/8/3r2BP/7K w - - 0 1 > >[D]8/p6R/1kpb4/8/8/8/3r2BP/7K w - - 0 1 > >I believe the correct solution is Bxc6. Which then leads to Kxc6 Rxa7 Rxh2 >Kg1. The position is now a KR vs krb. Can white now claim a draw because of >insufficient material to mate? No, because there are some exceptions (very few) where KRBKR is not a draw. >Do you agree with analysis? 1.Bxc6 seems correct but 1..Kxc6 is recognized by the Baron as a dead draw and is never considered (only 3&4 stone EGTB). But black has some alternatives that are a little more difficult to assess as a draw, like 1..a5 or 1..Bxh2. The position is still a draw though. >I like to know what people and/or chess engines think of this position. The Baron on PIII-500 (3&4 stone EGTB) ply time nodes score pv 6(13)& 0 18596 -131 g2c6 a7a5 c6e4 d2e2 h7b7 b6c5 e4g2 6(13). 0 19724 -131 g2c6 a7a5 c6e4 d2e2 h7b7 b6c5 e4g2 7(15)& 0 48198 -129 g2c6 a7a5 c6e4 a5a4 h2h4 d2h2 h1g1 a4a3 h7b7 b6a5 b7h7 7(15). 0 50389 -129 g2c6 a7a5 c6e4 a5a4 h2h4 d2h2 h1g1 a4a3 h7b7 b6a5 b7h7 8(17)& 1 148700 -136 g2c6 d6h2 h7b7 b6a6 c6e4 h2e5 h1g1 e5d4 g1f1 a6a5 8(17). 1 153323 -136 g2c6 d6h2 h7b7 b6a6 c6e4 h2e5 h1g1 e5d4 g1f1 a6a5 9(18)& 2 268265 -140 g2c6 d6h2 h7b7 b6a6 c6e4 h2d6 h1g1 d2d4 e4c6 d4d2 9(18). 2 287938 -140 g2c6 d6h2 h7b7 b6a6 c6e4 h2d6 h1g1 d2d4 e4c6 d4d2 10(21)& 9 1171446 -127 g2c6 a7a5 c6a4 d6f4 h2h4 d2a2 a4b3 a2b2 b3d5 a5a4 10(21). 9 1212865 -127 g2c6 a7a5 c6a4 d6f4 h2h4 d2a2 a4b3 a2b2 b3d5 a5a4 11(23)& 26 3286837 -133 g2c6 d6h2 h7b7 b6a6 c6e4 h2e5 h1g1 e5d4 g1f1 d2f2 f1e1 a6a5 b7d7 d4c5 11(23). 27 3376537 -133 g2c6 d6h2 h7b7 b6a6 c6e4 h2e5 h1g1 e5d4 g1f1 d2f2 f1e1 a6a5 b7d7 d4c5 Richard.
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