Author: Uri Blass
Date: 02:30:44 11/20/01
Go up one level in this thread
On November 19, 2001 at 16:31:16, Chessfun wrote: > >This position came about in a game where Fritz 7 clearly >winning played a move which seems to lose immediately, >although he still don't see he is lost for a few moves. > >35...Rd5 and lost. > >Seems all Fritz versions will play 35....Rd5. > >[D]8/1p3pk1/p1p3pp/2P1r3/1P1R4/P6P/5K1P/8 b - b3 0 35 Yace has no idea that 35...Rd5 is losing After playing 35...Rd5 36.Rxd5 cxd5 yace with some minutes has no problem to see that white is winning I believe that the problem is evaluation of unstoppable passed pawns yace cannot see by evaluation at small depth that the white pawn is the only unstoppable pawn in the following position(I also give analysis of the root position and the position after the trade in the end of my post). New position [D]8/5p2/2p2kpp/1p1p4/P7/7P/5K1P/8 w - - 0 1 Analysis by Yace 0.99.56: 6.axb5 cxb5 -+ (-5.10) Depth: 1 00:00:06 6.a5 -+ (-4.09) Depth: 1 00:00:06 6.a5 c5 -+ (-4.41) Depth: 2 00:00:06 6.a5 b4 7.Ke2 -+ (-3.95) Depth: 3 00:00:06 6.a5 b4 7.Ke3 -+ (-3.80) Depth: 3 00:00:06 6.a5 b4 7.Ke2 b3 -+ (-4.27) Depth: 4 00:00:06 6.a5 b4 7.Ke3 c5 -+ (-4.38) Depth: 4 00:00:06 6.a5 b4 7.Ke3 b3 8.Kd3 -+ (-4.08) Depth: 5 00:00:06 1kN 6.a5 d4 7.a6 d3 8.a7 d2 9.Ke2 c5 -+ (-3.09) Depth: 6 00:00:06 5kN 6.a5 b4 7.a6 b3 8.a7 b2 9.a8Q b1Q 10.Qxc6+ -+ (-2.49) Depth: 6 00:00:06 5kN New position 8/1p3pk1/p1p3pp/2P1r3/1P1R4/P6P/5K1P/8 b - b3 0 1 Analysis by Yace 0.99.56: 1...Rxc5 2.bxc5 +- (2.88) Depth: 1 00:00:00 1...f5 -+ (-1.49) Depth: 1 00:00:00 1...f5 2.Rd7+ Kf8 3.Rxb7 Rxc5 µ (-1.09) Depth: 2 00:00:00 1...f5 2.Rd7+ Kf6 3.Rxb7 ³ (-0.60) Depth: 2 00:00:00 1...Kf6 2.Rd7 ³ (-0.68) Depth: 2 00:00:00 1...Kf6 2.Kg3 µ (-1.30) Depth: 2 00:00:00 1...Kf6 2.Rd6+ Re6 3.Kf3 µ (-1.32) Depth: 3 00:00:00 1...g5 2.Rg4 µ (-1.34) Depth: 3 00:00:00 1...g5 2.Rd7 b5 µ (-1.37) Depth: 3 00:00:00 1...g5 2.Rd7 Rf5+ 3.Ke3 b5 µ (-1.10) Depth: 4 00:00:00 1...Kf6 2.Rd6+ Re6 3.b5 µ (-1.12) Depth: 4 00:00:00 1...Kf6 2.Kf3 g5 3.Kg4 µ (-1.33) Depth: 4 00:00:00 1...Kf6 2.h4 h5 3.Rd6+ Re6 4.Kf3 µ (-1.32) Depth: 5 00:00:00 10kN 1...Re7 2.b5 axb5 3.Kg2 µ (-1.33) Depth: 5 00:00:00 10kN 1...Re7 2.Kf3 f5 3.Kf4 Kf6 µ (-1.37) Depth: 5 00:00:00 10kN 1...Rd5 2.Ke3 f5 3.Rf4 Kf6 µ (-1.38) Depth: 5 00:00:00 10kN 1...Rd5 2.Rf4 Rd2+ 3.Kg3 Rd3+ 4.Rf3 Rxf3+ 5.Kxf3 -+ (-1.47) Depth: 5 00:00:00 10kN 1...Rd5 2.Rxd5 cxd5 3.Ke3 Kf6 4.Kd4 Ke6 5.h4 -+ (-1.54) Depth: 6 00:00:00 34kN 1...Rd5 2.Rg4 Rd2+ 3.Kg1 f5 4.Rg3 g5 5.h4 -+ (-1.74) Depth: 7 00:00:00 65kN 1...Rd5 2.Re4 Rd2+ 3.Kg3 Rd3+ 4.Kg2 Rxa3 5.Re7 a5 6.Rxb7 a4 -+ (-1.67) Depth: 8 00:00:00 179kN 1...Rd5 2.Re4 Rd2+ 3.Kg3 Rd3+ 4.Kg2 Rxa3 5.Re7 a5 6.Rxb7 Ra2+ 7.Kg3 a4 -+ (-1.65) Depth: 9 00:00:01 377kN 1...Rd5 2.Re4 Rd2+ 3.Kg3 Rd3+ 4.Kg2 Rxa3 5.Re7 a5 6.Rxb7 Rb3 7.Rb6 a4 8.Rxc6 -+ (-1.57) Depth: 10 00:00:02 916kN 1...Rd5 2.Rxd5 cxd5 3.a4 Kf6 4.a5 Ke6 5.b5 Kd7 6.bxa6 bxa6 7.Ke3 Kc6 8.Kd4 f5 9.h4 -+ (-1.75) Depth: 11 00:00:09 4688kN 1...Rd5 2.Rxd5 cxd5 3.a4 Kf6 4.b5 axb5 5.axb5 Ke6 6.b6 Kd7 7.Ke3 f5 8.h4 h5 9.Kd4 Ke6 10.c6 -+ (-1.70) Depth: 12 00:00:17 9277kN 1...Rd5 2.Rg4 Rd2+ 3.Kg1 f5 4.Rg3 Kf6 5.Re3 f4 6.Re8 g5 7.Rh8 -+ (-1.85) Depth: 13 00:01:22 44286kN 1...Rd5 2.Rg4 Rd2+ 3.Kg1 f5 4.Rg3 Kf6 5.h4 f4 6.Rf3 Ke5 7.Rf1 Re2 8.Rf3 b5 -+ (-1.85) Depth: 14 00:02:24 77946kN 1...Rd5 2.Rxd5 cxd5 3.a4 Kf6 4.a5 Ke6 5.b5 Kd7 6.bxa6 bxa6 7.Ke3 f5 8.h4 h5 9.c6+ -+ (-1.88) Depth: 15 00:06:12 202410kN (Blass, Tel-aviv 20.11.2001) New position [D]8/1p3pk1/p5pp/2Pp4/1P6/P6P/5K1P/8 w - - 0 1 Analysis by Yace 0.99.56: 3.c6 bxc6 -+ (-3.44) Depth: 1 00:00:00 3.a4 Kf6 4.b5 axb5 5.axb5 Ke6 6.b6 Kd7 7.Ke3 f5 8.h4 h5 9.Kd4 Ke6 -+ (-1.83) Depth: 1 00:00:00 3.h4 -+ (-1.57) Depth: 1 00:00:00 3.Kf3 -+ (-1.49) Depth: 1 00:00:00 3.Kf3 f5 -+ (-1.87) Depth: 2 00:00:00 3.a4 Kf6 4.b5 axb5 5.axb5 Ke6 6.b6 Kd7 7.Ke3 f5 8.h4 h5 9.Kd4 Ke6 -+ (-1.83) Depth: 2 00:00:00 3.a4 Kf6 4.b5 axb5 5.axb5 Ke6 6.b6 Kd7 7.Ke3 f5 8.h4 h5 9.Kd4 Ke6 -+ (-1.83) Depth: 3 00:00:00 3.Kf3 f5 4.a4 -+ (-1.81) Depth: 3 00:00:00 3.Kf3 f5 4.Ke3 -+ (-1.79) Depth: 3 00:00:00 3.Kf3 Kf6 4.Kf4 g5+ 5.Kf3 -+ (-1.90) Depth: 4 00:00:00 3.a4 Kf6 4.b5 axb5 5.axb5 Ke6 6.b6 Kd7 7.Ke3 f5 8.h4 h5 9.Kd4 Ke6 -+ (-1.83) Depth: 4 00:00:00 3.a4 Kf6 4.b5 axb5 5.axb5 Ke6 6.b6 Kd7 7.Ke3 f5 8.h4 h5 9.Kd4 Ke6 -+ (-1.83) Depth: 5 00:00:00 3.a4 Kf6 4.b5 axb5 5.axb5 Ke6 6.b6 Kd7 7.Ke3 f5 8.h4 h5 9.Kd4 Ke6 -+ (-1.83) Depth: 6 00:00:00 3.a4 Kf6 4.b5 axb5 5.axb5 Ke6 6.b6 Kd7 7.Ke3 f5 8.h4 h5 9.Kd4 Ke6 -+ (-1.83) Depth: 7 00:00:00 3.a4 Kf6 4.b5 axb5 5.axb5 Ke6 6.b6 Kd7 7.Ke3 f5 8.h4 h5 9.Kd4 Ke6 -+ (-1.83) Depth: 8 00:00:00 3.a4 Kf6 4.b5 axb5 5.axb5 Ke6 6.b6 Kd7 7.Ke3 f5 8.h4 h5 9.Kd4 Ke6 -+ (-1.83) Depth: 9 00:00:00 3.a4 Kf6 4.b5 axb5 5.axb5 Ke6 6.b6 Kd7 7.Ke3 f5 8.h4 h5 9.Kd4 Ke6 -+ (-1.83) Depth: 10 00:00:00 1kN 3.a4 Kf6 4.b5 axb5 5.axb5 Ke6 6.Ke3 Ke5 7.Kd3 d4 8.h4 Kd5 9.c6 bxc6 10.bxc6 Kxc6 -+ (-1.87) Depth: 11 00:00:01 508kN 3.a4 Kf6 4.b5 axb5 5.axb5 Ke6 6.Ke3 Ke5 7.Kd3 d4 8.h4 Kd5 9.c6 bxc6 10.b6 Kd6 -+ (-1.88) Depth: 12 00:00:06 2727kN 3.a4 Kf6 4.b5 axb5 5.axb5 Ke6 6.Ke2 f5 7.h4 d4 8.c6 bxc6 9.bxc6 Kd6 10.Kf1 f4 11.c7 Kxc7 12.Ke1 h5 13.Kf2 -+ (-1.94) Depth: 13 00:00:21 10927kN 3.a4 Kf6 4.b5 axb5 5.axb5 Ke7 6.h4 f5 7.Ke2 g5 8.hxg5 hxg5 9.h3 f4 10.Kd3 Ke6 11.Kd4 f3 12.Ke3 f2 13.Kxf2 Kd7 14.c6+ bxc6 15.bxc6+ Kxc6 16.h4 -+ (-1.81) Depth: 14 00:01:22 43723kN 3.a4 Kf6 4.b5 axb5 5.c6 bxc6 6.a5 b4 7.Ke2 h5 8.Kd2 g5 9.a6 g4 10.hxg4 b3 11.gxh5 Ke6 12.a7 b2 13.a8Q Kd6 -+ (-1.41) Depth: 15 00:02:34 82186kN 3.a4 Kf6 4.b5 axb5 5.a5 b4 6.Ke2 µ (-1.38) Depth: 15 00:02:48 89194kN 3.a4 Kf6 4.b5 axb5 5.a5 b4 6.Ke2 d4 7.c6 bxc6 8.Kd2 b3 9.a6 d3 10.Kxd3 b2 11.Kc2 Ke5 12.a7 b1R 13.a8Q f5 µ (-0.98) Depth: 16 00:04:10 133993kN 3.a4 Kf6 4.b5 axb5 5.c6 bxc6 6.a5 Kf5 7.a6 Ke6 8.h4 g5 = (0.02) Depth: 16 00:04:41 149786kN 3.a4 Kf6 4.b5 axb5 5.c6 bxc6 6.a5 b4 7.a6 b3 8.h4 g5 9.hxg5+ hxg5 10.a7 b2 11.a8Q b1Q 12.Ke3 = (0.02) Depth: 16 00:04:48 153727kN 3.a4 Kf6 4.b5 axb5 5.c6 bxc6 6.a5 b4 7.Ke2 b3 8.Kd2 d4 9.a6 b2 10.Kc2 b1Q+ 11.Kxb1 d3 12.a7 d2 13.Kc2 d1R 14.a8Q h5 ² (0.42) Depth: 17 00:06:49 218837kN 3.a4 Kf6 4.b5 axb5 5.c6 bxc6 6.a5 b4 7.Ke2 b3 8.Kd2 d4 9.a6 b2 10.Kc2 d3+ 11.Kxb2 d2 12.Kc2 Ke6 13.a7 d1R 14.a8Q Rd3 +- (1.42) Depth: 17 00:07:22 236087kN 3.a4 Kf6 4.b5 axb5 5.c6 bxc6 6.a5 b4 7.Ke2 b3 8.Kd2 d4 9.a6 c5 10.a7 c4 11.a8Q Kg7 12.Qe8 c3+ 13.Kd3 +- (3.30) Depth: 17 00:08:33 274632kN (Blass, Tel-aviv 20.11.2001)
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