Author: Joachim Rang
Date: 08:05:30 10/10/05
Go up one level in this thread
On October 09, 2005 at 18:10:59, Peter Berger wrote: >[D]8/1k4p1/8/5p1p/PPP5/6K1/8/8 w - - > >This position was pointed out to me by Chandler Yergin who did some work on it . >It is well possible that it has been discussed at CCC before, as it is close to >a very famous one. > >It is quite accessible for humans IMHO, but surprisingly difficult for some of >the engines that are well-known to rock in pawn endgames, like Yace and >Shredder. Fun starts when the engines go deep. It looks like one of the very few >pawn endgames that is difficult for engines without simply transposing into a >queen+ pawns endgame soon. > >With backsolving it is easy to get convincing scores, but to me it is not clear >what makes it so hard to judge for engines from the starting position. > >Have fun. > >Peter Funny - Fruit 2.2 initially likes black too. The score from whites perspective is steadily climbing however and in the end quite ok although far from ccompletely winning. The below analysis is done without TBs and on a mere Pentium IV 3.0 GHz with a dev-compile (20% slower): FEN: 8/1k4p1/8/5p1p/PPP5/6K1/8/8 w - - 0 1 Fruit 2.2 (dev): 12/21 00:00 279.683 0 -0,63 a4a5 Kb7a6 Kg3g2 h5h4 Kg2h2 f5f4 Kh2g2 g7g5 c4c5 Ka6b5 Kg2f3 h4h3 13/22 00:00 464.325 0 -0,75 a4a5 Kb7a6 Kg3g2 h5h4 Kg2h2 f5f4 Kh2g2 g7g5 c4c5 Ka6b5 a5a6 Kb5xa6 c5c6 14/24 00:01 744.938 0 -0,99 a4a5 Kb7a6 Kg3g2 h5h4 Kg2h2 f5f4 Kh2g1 g7g5 Kg1g2 g5g4 Kg2g1 f4f3 Kg1f2 h4h3 15/29 00:01 1.277.023 0 -0,80 a4a5 Kb7a6 Kg3g2 h5h4 Kg2h2 f5f4 Kh2g1 g7g5 Kg1g2 g5g4 Kg2g1 f4f3 Kg1f2 h4h3 Kf2g3 16/31 00:02 2.059.589 0 -0,74 a4a5 Kb7a6 Kg3g2 h5h4 Kg2h3 g7g5 Kh3h2 g5g4 Kh2g2 h4h3+ Kg2g3 f5f4+ Kg3h2 Ka6b7 c4c5 f4f3 Kh2g3 Kb7c6 17/31 00:05 3.965.524 0 -0,53 a4a5 Kb7a6 Kg3g2 h5h4 Kg2h3 g7g5 Kh3h2 g5g4 Kh2g2 f5f4 Kg2g1 Ka6b7 b4b5 h4h3 Kg1h2 Kb7c7 a5a6 18/35 00:09 7.369.419 822.500 -0,50 a4a5 Kb7a6 Kg3g2 h5h4 Kg2h3 g7g5 Kh3h2 g5g4 Kh2g2 f5f4 Kg2g1 Ka6b7 b4b5 Kb7c7 a5a6 h4h3 a6a7 Kc7b7 b5b6 19/37 00:11 9.182.704 842.000 -0,50 a4a5 Kb7a6 Kg3g2 h5h4 Kg2h3 g7g5 Kh3h2 g5g4 Kh2g2 f5f4 Kg2g1 Ka6b7 b4b5 h4h3 a5a6+ Kb7a7 Kg1h2 f4f3 Kh2g3 Ka7b6 20/40 00:14 12.333.265 861.429 -0,55 a4a5 Kb7a6 Kg3g2 h5h4 Kg2h3 g7g5 Kh3h2 g5g4 Kh2g2 h4h3+ Kg2g3 Ka6a7 b4b5 Ka7b7 a5a6+ Kb7b6 c4c5+ Kb6a7 c5c6 Ka7b6 a6a7 Kb6xa7 c6c7 Ka7b7 21/46 00:48 40.403.002 840.000 -0,48 a4a5 Kb7a6 Kg3g2 g7g5 Kg2g3 g5g4 Kg3f2 f5f4 Kf2g2 f4f3+ Kg2g3 Ka6a7 b4b5 Ka7b7 Kg3f2 Kb7b8 a5a6 Kb8a7 Kf2g3 Ka7b6 Kg3f2 h5h4 22/47 01:06 56.109.670 852.615 -0,55 a4a5 Kb7a6 Kg3g2 g7g5 Kg2g3 g5g4 Kg3f2 h5h4 c4c5 Ka6b5 Kf2g2 f5f4 Kg2g1 f4f3 Kg1f2 h4h3 Kf2g3 f3f2 Kg3xf2 h3h2 Kf2g2 g4g3 Kg2h1 23/51 03:31 172.429.631 816.628 -0,23 a4a5 Kb7a6 Kg3g2 g7g5 Kg2g3 g5g4 Kg3f2 h5h4 c4c5 Ka6b5 Kf2g2 f5f4 Kg2g1 f4f3 Kg1f2 h4h3 Kf2g3 f3f2 Kg3xf2 h3h2 Kf2g2 g4g3 Kg2h1 Kb5c6 24/55 06:04 307.932.888 844.544 +0,12 a4a5 Kb7a6 Kg3g2 g7g5 Kg2g3 g5g4 Kg3f2 h5h4 c4c5 Ka6b5 Kf2g2 f5f4 Kg2g1 f4f3 Kg1f2 h4h3 Kf2g3 f3f2 Kg3xf2 h3h2 Kf2g2 g4g3 Kg2h1 Kb5c6 a5a6 25/55 07:57 411.064.629 861.687 +0,14 a4a5 Kb7a6 Kg3g2 g7g5 Kg2g3 h5h4+ Kg3h2 f5f4 c4c5 Ka6b7 Kh2g2 g5g4 Kg2g1 f4f3 Kg1f2 Kb7b8 b4b5 h4h3 Kf2g3 Kb8b7 b5b6 f3f2 Kg3xf2 h3h2 Kf2g2 g4g3 Kg2h1 26/57 12:20 655.178.074 884.982 +0,16 a4a5 Kb7a6 Kg3g2 g7g5 Kg2g3 Ka6b7 b4b5 Kb7b8 Kg3f3 Kb8a7 c4c5 Ka7b7 Kf3g3 Kb7b8 a5a6 f5f4+ Kg3f3 Kb8a7 Kf3f2 h5h4 Kf2g2 g5g4 Kg2g1 g4g3 c5c6 Ka7b6 Kg1g2 27/57 21:28 1.159.086.448 899.546 +0,32 a4a5 Kb7a6 Kg3g2 g7g5 Kg2g3 Ka6b7 b4b5 Kb7b8 Kg3f3 Kb8b7 c4c5 h5h4 Kf3g2 f5f4 b5b6 g5g4 Kg2g1 h4h3 Kg1h2 f4f3 Kh2g3 f3f2 Kg3xf2 h3h2 Kf2g2 g4g3 Kg2h1 Kb7c6 28/64 31:18 1.672.331.429 890.547 +0,32 a4a5 Kb7a6 Kg3g2 g7g5 Kg2g3 Ka6a7 b4b5 Ka7b7 Kg3g2 Kb7a7 c4c5 Ka7b7 Kg2g3 h5h4+ Kg3g2 f5f4 b5b6 g5g4 Kg2g1 h4h3 Kg1h2 f4f3 Kh2g3 f3f2 Kg3xf2 h3h2 Kf2g2 g4g3 Kg2h1 Kb7c6 29/93 1:39:56 5.193.672.332 866.100 +1,29 a4a5 Kb7a6 c4c5 Ka6b5 Kg3g2 g7g6 Kg2g3 g6g5 Kg3g2 h5h4 Kg2h2 f5f4 Kh2g2 g5g4 Kg2g1 f4f3 Kg1f2 h4h3 Kf2g3 f3f2 Kg3xf2 h3h2 Kf2g2 g4g3 Kg2h1 Kb5a6 c5c6 Ka6a7 Kh1g2 Ka7a6 30/93 2:35:50 7.991.119.619 854.636 +2,12 a4a5 Kb7a6 c4c5 Ka6b5 Kg3g2 h5h4 Kg2h3 g7g5 Kh3h2 f5f4 Kh2g2 g5g4 Kg2g1 f4f3 Kg1f2 Kb5c6 a5a6 Kc6c7 b4b5 g4g3+ Kf2xf3 Kc7b8 Kf3g2 Kb8a7 Kg2h3 g3g2 Kh3h2 h4h3 Kh2g1 Ka7b8 b5b6 31/93 4:08:24 12.547.566.766 841.867 +2,48 a4a5 Kb7a6 c4c5 Ka6b5 Kg3g2 h5h4 Kg2h3 g7g5 Kh3h2 f5f4 Kh2g2 g5g4 Kg2g1 f4f3 Kg1f2 h4h3 Kf2g3 f3f2 Kg3xf2 h3h2 Kf2g2 g4g3 Kg2h1 Kb5a6 c5c6 Ka6a7 b4b5 Ka7a8 a5a6 Ka8b8 b5b6 Kb8c8 32/93 6:13:50 18.818.090.570 838.941 +2,75 a4a5 Kb7a6 c4c5 Ka6b5 Kg3g2 h5h4 Kg2h3 g7g5 Kh3h2 g5g4 Kh2g2 g4g3 Kg2f3 f5f4 Kf3g2 Kb5c6 a5a6 Kc6c7 b4b5 f4f3+ Kg2xf3 Kc7b8 Kf3g2 Kb8a7 Kg2g1 h4h3 Kg1h1 Ka7a8 c5c6 Ka8b8 b5b6 g3g2+ Kh1g1 Kb8c8
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