Author: Uri Blass
Date: 23:35:22 01/23/05
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On January 24, 2005 at 01:40:44, Will Singleton wrote: >[d]8/5p2/6p1/5k1p/5P1P/6PK/5rB1/8 b - - bm Rxg2 > >Amateur finds this in < 3 sec, faster than some others. A null-move issue? > >14 255 198 911657 Rc2 Bd5 f6 Bf7 Rb2 Bd5 Re2 Bc6 Rd2 >15 255 236 1091636 Rc2 Bd5 f6 Bf7 Rb2 Bd5 Re2 Bc6 Rd2 >15 328 277 1280278 Rxg2 Kxg2 Kg4 Kf2 Kh3 Kf3 f5 Kf2 Kh2 Kf3 Kg1 g4 hxg4 >16 264 289 1341561 Rxg2 Kxg2 Kg4 Kf2 Kh3 f5 gxf5 Kf3 f6 Kf4 Kg2 Kxf5 Kxg3 >17 334 312 1455185 Rxg2 Kxg2 Kg4 Kf2 Kh3 f5 gxf5 Kf3 f6 Kf4 Kg2 Kxf5 Kxg3 >18 344 340 1592589 Rxg2 Kxg2 Kg4 Kf2 Kh3 f5 gxf5 Kf3 f6 Kf2 Kg4 Kg2 f4 >19 348 389 1826593 Rxg2 Kxg2 Kg4 Kf2 Kh3 f5 gxf5 Kf3 f6 Kf2 Kg4 Kg2 f4 >20 348 457 2147297 Rxg2 Kxg2 Kg4 Kf2 Kh3 f5 gxf5 Kf3 f6 Kf2 Kg4 Kg2 f4 >21 431 569 2673404 Rxg2 Kxg2 Kg4 Kf2 Kh3 f5 gxf5 Kf3 f6 Kf2 Kg4 Kg2 f4 No null move because almost no program use null move pruning in pawn endgames. I guess that it is evaluation issue and most programs do not have special evaluation for pawn endgame and they need some plies to evaluate the following lines as more than +2.5 for black Rxg2 Kxg2 Kg4 Kf2 Kh3 Kf3 f5 Kf2 Kh2 Kf3 Kg1 g4 Movei needs 6 plies after the following line to see a score that can convince it to play Rxg2. Uri
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