Author: Paulo Soares
Date: 17:00:12 06/09/00
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On June 09, 2000 at 05:39:21, blass uri wrote: sniped >The problem is that programs do not know to evaluate unstoppable pawns > >try the following position that can happen after >3.Kf3 f5 4.g4 g6 5.gxf5 gxf5 6.kg3 Kc6 7.Kh4 h6 8.Kh5 e4 9.a6 Kb6 10.Kxh6 f4 > > >[D]8/8/Pk5K/2p5/2P1pp2/8/5P1P/8 w - - 0 1 > >Programs cannot see at evaluation time that black is winning because of >unstoppable pawn. > >If I give them to analyze at 1 ply depth they give a big advantage for white. > >part of the programs know that h2 is unstoppable but they do not know that e4 is >unstoppable and that e4 can be a queen faster than h2 > >Uri Look for these 2 analyses done by Fritz6a (PIII-450 HT=80Mb) after 3. Kf3. I used n moves (Infinite Analyses) with n=5: 8/6pp/3k1p2/P1p1p3/2P5/5KP1/5P1P/8 b - - 0 1 I. Time= ~1.5Min 1. +- (1.53): 3...h5 4.a6 Kc6 5.Ke4 Kb6 6.Kd5 Kxa6 7.Kxc5 Kb7 8.Kd6 2. +- (3.03): 3...f5 3. +- (3.34): 3...Kd7 4. +- (3.66): 3...Kc7 5. +- (2.72): 3...g6 II. The same position after ~2.5min: 1. ± (1.16): 3...f5 4.g4 g6 5.gxf5 gxf5 6.Kg3 h6 7.Kh4 Kc7 8.Kh5 2. +- (1.56): 3...h5 4.g4 hxg4+ 5.Kxg4 g6 6.h4 Kc6 7.h5 f5+ 8.Kh4 3. +- (2.19): 3...g6 4.a6 Kc6 5.Ke4 Kb6 6.Kd5 Kxa6 7.Kxc5 Kb7 8.Kd6 4. +- (3.97): 3...Kd7 5. +- (3.66): 3...Kc7 My mistake went have believe that 3 ...h5 were the only possible defense for blacks, forgetting that always I have to analyze other possible moves. I didn't have patience to analyze the position with other moves because I wanted to be the first to answer to Oliver's post. Living and learning. Paulo
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