Author: Vincent Diepeveen
Date: 07:41:27 10/07/00
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On October 07, 2000 at 04:31:09, Peter McKenzie wrote: >I've been browsing 'Comprehensive Chess Endings, Pawn Endings' by Averbakh & >Maiselis, picking out a few interesting looking positions to test my program >with. Here is the little test suite I came up with: > >8/1p4kP/5pP1/3p4/8/4P3/7K/8 w - - bm e4; id "CCE4 479"; >8/1pp5/3k3p/PP6/2P2K2/8/8/8 b - - bm Kd7; id "CCE 491a"; >2k2K2/8/pp6/2p5/2P5/PP6/8/8 w - - bm a4; id "CCE4 530"; >8/pp3p2/8/6kp/8/3K1PP1/PP6/8 b - - bm f5; id "CCE4 608"; >8/pp2k1pp/2p5/2P1p3/2P1P2P/6P1/P7/2K5 b - - bm g5; id "CCE4 679"; >8/1p6/p1p5/P1Pp2pp/1P1P1p1k/5P1P/6PK/8 w - - bm g3 g4; id "CCE 680"; >8/1k6/p4p2/2p2P2/p1P2P2/2P5/P1K5/8 w - - bm Kc1; id "CCE 765"; all peanuts except #7 kc1 under 1 minute single cpu, note that position #3.a4 is not correct. Ke8 winning there. i get near to draw score for a4 , but didn't checkout whether it also wins. Ke8 wins obviously and is the human move. EGTB don't lie. >Some of these are pretty hard, some are easy, and some are in between. LambChop >gets 4/7 in under 15min/pos of P133 time. i have to checkout Kc1 position 7. i'm at 40 ply now, but it doesn't see how to win with Kc1. all moves are +1.96 getting opposition and walking aroudn the pawns at the king side gotta be seen within 40 ply. perhaps you have the line which shows kc1 is winning? didn't check dual and only checked with small 80mb hashtable as other cpu is busy. Greetings, Vincent >The 5th position is cool, white threatens g4 to effectively lock the position >hence the temporary pawn sac g5! is the only winning move for black. > >Would be interested to see how other programs do on these. I can give more >details on the other positions if anyone is interested. > >Not sure how much tablebases will help on these positions, I'd expect them to >help alot on the 2nd position but not so much on the rest. > >cheers, >Peter
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