Author: Kai Skibbe
Date: 08:46:25 10/29/01
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On October 29, 2001 at 01:30:12, Dieter Buerssner wrote: >Tinker caught Yace in a nice stalemate trap. > >[D] 7k/6R1/6R1/1r5P/6K1/8/8/8 b - - 0 55 > >Yace just captured on g7. It is easy to see for a human, but engines seem to >have problems with this. Yace got a nice fail low from +7.4 to draw score in the next move. Do other engines see this immediately? With and without TBs (KRRKR >can help here). Hi Dieter, I let Gromit 3.9.5 on my Celeron 400MHz analyse the position before move 55. Rxg7. Here is the output with all 4-men tablebases : Analysis by Gromit 3.9.5: 55.Tcxg7 Tb4+ 56.Kf5 Tb5+ 57.Ke6 Txh5 +- (7.15) Tiefe: 4/12 00:00:00 24kN, tb=22 55.Tcxg7 +- (6.95) Tiefe: 5/14 00:00:00 55kN, tb=78 55.Tcxg7 +- (6.95) Tiefe: 5/14 00:00:00 57kN, tb=87 55.Tcxg7 Tb4+ 56.Kh3 Th4+ 57.Kg3 Th3+ 58.Kf4 Th4+ 59.Tg4 +- (7.13) Tiefe: 6/16 00:00:00 78kN, tb=361 55.Tcxg7 +- (6.93) Tiefe: 7/17 00:00:01 111kN, tb=1148 55.Tcxg7 +- (5.93) Tiefe: 7/17 00:00:01 112kN, tb=1172 55.Tcxg7 +- (1.93) Tiefe: 7/17 00:00:01 113kN, tb=1191 55.Tcxg7 Tg5+ 56.Kh3 Txh5+ = (0.01) Tiefe: 7/17 00:00:01 114kN, tb=1213 55.Kh4 = (0.02) Tiefe: 7/17 00:00:01 140kN, tb=1331 55.Kh4 ± (1.02) Tiefe: 7/19 00:00:01 146kN, tb=1384 55.Kh4 Tb4+ 56.Kh3 Tb3+ 57.Kg2 Tc3 58.Td7 Tc2+ 59.Kf3 Tc3+ 60.Ke4 Tc4+ 61.Ke3 +- (4.53) Tiefe: 7/22 00:00:03 298kN, tb=2456 55.Kf3 +- (4.54) Tiefe: 7/22 00:00:03 332kN, tb=2864 And here the output without tablebases : Analysis by Gromit 3.9.5: +- (7.11) Tiefe: 4/12 00:00:00 20kN 55.Tcxg7 Tb4+ 56.Kh3 Th4+ 57.Kg3 Th3+ +- (7.03) Tiefe: 5/14 00:00:00 58kN 55.Tcxg7 +- (6.73) Tiefe: 6/16 00:00:00 71kN 55.Tcxg7 +- (6.73) Tiefe: 6/18 00:00:00 78kN 55.Tcxg7 Tb4+ 56.Kh3 Th4+ +- (6.54) Tiefe: 7/18 00:00:01 142kN 55.Tcxg7 +- (6.24) Tiefe: 8/22 00:00:01 221kN 55.Tcxg7 +- (5.24) Tiefe: 8/22 00:00:01 225kN 55.Tcxg7 Tb4+ 56.Kf5 Tb5+ ± (1.25) Tiefe: 8/22 00:00:02 233kN 55.Tgxg7 ± (1.26) Tiefe: 8/22 00:00:02 271kN 55.Tgxg7 Tg5+ ± (1.26) Tiefe: 8/22 00:00:02 284kN 55.Kh4 ± (1.27) Tiefe: 8/22 00:00:02 313kN 55.Kh4 +- (2.27) Tiefe: 8/22 00:00:02 322kN 55.Kh4 Tb4+ 56.Kh3 Tb3+ 57.Kg2 Tc3 58.Td7 Tc4 59.h6 Tc2+ 60.Kf3 Tc3+ 61.Ke4 Tc4+ 62.Ke3 +- (4.80) Tiefe: 8/23 00:00:06 761kN 55.Kf3 +- (4.81) Tiefe: 8/23 00:00:08 1005kN So Gromit would have avoided the draw on blitz-level. Best regards Kai
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