Author: Peter McKenzie
Date: 18:10:26 01/09/03
Go up one level in this thread
On January 09, 2003 at 21:00:33, Drexel,Michael wrote: >On January 09, 2003 at 20:12:11, Gordon Rattray wrote: > >>[D] 8/pp5p/4k1p1/3p4/2pPPK2/2P5/PP5P/8 b - - 0 41 >> >>In this position, with Black to move, I was surprised by the consideration given >>to g5+ by some programs. From a "human" point of view, doesn't it just look to >>give White an easy win? >> >>Deep Fritz 7 avoids g5+ completely, but Shredder Paderborn, Chess Tiger 14 and >>CM9000 are, in my opinion, relatively slow to identify g5+ as losing for Black. >>They all very quickly see Black is lost after playing a further Kxg5. >> >>I think initially h6 is best with a likely draw, but the main point is that g5+ >>is definitely not best. >> >>Anyone comment on the latest Shredder (7) and Chess Tiger (15) against this >>position? >> >>thanks >> >>Gordon > >Fritz 8 clearly has some special code regarding pawn endings with protected >passed pawn against unprotected passed pawn. usually the side with unprotected >pawn will lose (Zugzwang). Fritz 8 needs not 1 second to avoid g5 on my >PC.however Fritz 8 is not able to identify g5 much faster than other programs as >losing move. >other programs like Ruffian or Shredder overestimate the protected passed pawn >e5 after 1...h6 2.e5. Fritz 8 not. I think this could be an example of Fritz seeing that the positon is kind of blocked. > > >Analysis by Shredder 7: > >1. = (0.08): 1...g5+ 2.Kf3 h5 3.e5 a5 4.a4 Kf5 5.h3 g4+ 6.hxg4+ hxg4+ 7.Kg2 Kg6 >8.Kh2 Kf5 9.b4 >2. ² (0.41): 1...dxe4 2.Kxe4 h6 3.a4 Kd6 4.a5 b6 5.axb6 axb6 6.h3 Ke6 7.Ke3 g5 >8.Kd2 >3. ² (0.69): 1...h6 2.e5 b6 3.Kg4 Kf7 4.Kg3 Ke6 5.Kf4 Kf7 6.Ke3 b5 7.Kf2 a5 > >depth 19
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