Author: Robert Hyatt
Date: 13:22:56 09/25/02
Go up one level in this thread
On September 25, 2002 at 07:09:37, Yuriy Lyapko wrote: >Nothing surprising. >Crafty (like some other top amateur engines) is very EGTB-centric and weak in >simple endgames without them(EGTB's). For example, it can't mate with KBNK. Crafty mates with KBN vs K perfectly here, without tables. If you look at the evaluation code, it has specific knowledge to drive the king to the edge, then to the corner covered by the bishop. I haven't tried it in a long while, but I once tested it against a TB-enabled version and while it couldn't mate in the optimal number of moves, it mated _every_ time... In >particular position all you need is a special eval routine for KRPKR. Crafty has this. It just doesn't claim that the score is a draw when the weaker side gets the king to the right place. But try it without tables to see what I mean, it understands how to cut the weaker side's king off and march the pawn up the board... > My weak >Bestia has it (very simple though) and will not loose such positions. Here is >its thinking output(on AMD K6-2/450MHz at 1min/move): >Static eval=-10 > 7 -10 34 40679 c4c6 f4f3 c6a6 b2e2 a6d6 e2e3 f1f2 > 7 -10 35 50776 c4c6 f4f3 c6a6 b2e2 a6d6 e2e3 f1f2 > 8 -10 80 126744 c4c6 f4f3 c6a6 b2e2 a6d6 e2e3 f1f2 g4f4 > 8 -10 94 147705 c4c6 f4f3 c6a6 b2e2 a6d6 e2e3 f1f2 g4f4 > 9 -35 148 232498 c4c6 g4g3 > 9 -34 225 382723 c4c3 > 9 -10 376 480872 c4c3 f4f3 c3c5 g4f4 f1e1 f3f2 e1f1 f4e3 c5c3 e3e4 > 9 -10 399 518182 c4c3 f4f3 c3c5 g4f4 f1e1 f3f2 e1f1 f4e3 c5c3 e3e4 > 10 -10 406 711772 c4c3 f4f3 c3c5 g4f4 f1e1 f3f2 e1f1 f4e3 c5c3 > 10 -10 464 807777 c4c3 f4f3 c3c5 g4f4 f1e1 f3f2 e1f1 f4e3 c5c3 > 11 -10 684 1236634 c4c3 f4f3 c3c5 g4f4 f1e1 f3f2 e1f1 f4g4 > 11 -10 1269 2220564 c4c3 f4f3 c3c5 g4f4 f1e1 f3f2 e1f1 f4g4 > 12 -10 2107 3723045 c4c3 f4f3 c3c5 g4f4 f1e1 f4e3 c5c3 e3e4 e1f1 > 12 -10 2981 5228322 c4c3 f4f3 c3c5 g4f4 f1e1 f4e3 c5c3 e3e4 e1f1 > 13 -10 5947 10351821 c4c3 f4f3 c3c5 g4f4 f1e1 f4e3 c5c3 > >For all other moves(including Rc8) score fails down to -2.65 at ply 9(~4 sec) >with g4g3. Nearly every move is a dead draw if the rook isn't given away for nothing. Rc8 is a dead draw as is Rc3... no difference... > >Best regards, >George
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