Author: Vincent Lejeune
Date: 03:56:35 03/27/05
Go up one level in this thread
On March 26, 2005 at 21:30:04, Robert Hyatt wrote: >On March 26, 2005 at 19:46:58, Vincent Lejeune wrote: > >>On March 26, 2005 at 15:34:45, Dieter Buerssner wrote: >> >>>On March 26, 2005 at 15:29:42, Dieter Buerssner wrote: >>> >>>>On March 26, 2005 at 15:20:17, Mike Byrne wrote: >>>> >>>>>after the main line : Kf2 f5 h3 Kc7 g3 hxg3 is winning no? >>>>> >>>>>Black(2): his >>>>> white black >>>>> 1 Kf2 f5 >>>>> 2 h3 Kc7 >>>>> 3 g3 ... >>>>> 17 25.52 -7.17 3. ... hxg3+ 4. Kxg3 f4+ 5. Kg4 b6 >>>>> 6. h4 f3 7. Kxf3 gxh4 8. c6 Kxc6 9. >>>>> Kg4 b5 10. a5 b4 11. Kxh4 Kb5 12. Kg4 >>>>> >>>> >>>>In this line, Yace says 8. c6? is losing, while 8.cxb6 is draw. >>> >>>It is such an obvious blunder, that it looks like a bug in Crafty. >>> >>>Regards, >>>Dieter >> >> >>Probably a bug in the static eval of the pawn endgame. after 3 min@3 Ghz : > >I can't reproduce Mikes PV with this "c6 bug"... I don't get c6 at any point >that I can see, it always takes... > >Any ideas? I succeded to replicate c6 as best move : 1) without any EGTB 2) starting with this position 8/1p1k4/5p2/2Pp2p1/P2P3p/8/6PP/6K1 w - - 0 1 3) under chessbase interface 4) played 1. Kf2 f5 2. h3 Kc7 3. g3 hxg3+ 4. Kxg3 with 5 between each move 5) the score is rising for white but it so long I stopped Is it a problem related to only pawns endgame eval or linked to hashtables too ? 8/1pk5/8/2Pp1pp1/P2P4/6KP/8/8 b - - 0 1 Analysis by Crafty 19.19: 4...Rc6 µ (-1.00) Profondeur: 1/5 00:00:00 4...Rc6 5.a5 µ (-0.98) Profondeur: 2/5 00:00:00 4...Rc6 5.Rf3 Rc7 µ (-0.90) Profondeur: 3/7 00:00:00 4...Rd7 5.a5 Rc6 µ (-0.98) Profondeur: 3/7 00:00:00 4...Rd7 5.a5 Rc6 6.Rf3 µ (-0.98) Profondeur: 4/9 00:00:00 4...Rd7 5.a5 Rc6 6.Rf3 Rb5 µ (-0.98) Profondeur: 5/11 00:00:00 4...Rd7 5.a5 Rc6 6.h4 gxh4+ 7.Rxh4 f4 8.Rg4 µ (-0.96) Profondeur: 6/11 00:00:00 4kN 4...b6 5.cxb6+ Rxb6 6.h4 f4+ 7.Rg4 gxh4 8.Rxf4 h3 µ (-1.30) Profondeur: 6/11 00:00:00 8kN 4...b6 5.cxb6+ Rxb6 6.h4 gxh4+ 7.Rxh4 Ra5 8.Rg5 Rxa4 9.Rxf5 Rb3 ³ (-0.40) Profondeur: 7/14 00:00:00 18kN 4...Rd7 5.h4 f4+ 6.Rh3 gxh4 7.Rxh4 f3 8.Rg3 Re6 9.Rxf3 ³ (-0.64) Profondeur: 7/14 00:00:00 27kN 4...f4+ 5.Rg4 b6 6.h4 f3 7.Rxf3 gxh4 8.Rf4 µ (-0.78) Profondeur: 7/14 00:00:00 36kN 4...f4+ 5.Rg4 Rc6 6.h4 gxh4 7.Rxh4 Rd7 8.Rg4 Re6 9.Rxf4 ³ (-0.64) Profondeur: 8/15 00:00:00 56kN 4...f4+ 5.Rg4 b6 6.h4 f3 7.Rxf3 gxh4 8.cxb6+ Rxb6 9.Rg4 Ra5 10.Rxh4 Rxa4 ³ (-0.50) Profondeur: 9/16 00:00:01 120kN 4...f4+ 5.Rg4 Rd7 6.h4 f3 7.Rxf3 gxh4 8.Rg4 Re7 9.a5 Re6 10.Rxh4 µ (-0.82) Profondeur: 10/19 00:00:01 205kN 4...f4+ 5.Rg4 Rd7 6.a5 Rd8 7.h4 f3 8.Rxf3 gxh4 9.Rg4 Re7 10.Rxh4 µ (-0.72) Profondeur: 11/19 00:00:01 347kN 4...f4+ 5.Rg4 Rd7 6.a5 Rd8 7.c6 Rc7 8.cxb7 Rxb7 9.h4 f3 10.Rxf3 gxh4 11.Rg4 Ra6 12.Rxh4 Rxa5 ³ (-0.50) Profondeur: 12/22 00:00:01 580kN 4...f4+ 5.Rg4 Rd7 6.a5 Rd8 7.Rf3 Rc7 8.Re2 Rb8 9.Rf2 Ra7 10.c6 bxc6 11.Rf3 ³ (-0.60) Profondeur: 13/24 00:00:02 1016kN 4...f4+ 5.Rg4 b6 6.h4 f3 7.Rxf3 gxh4 8.cxb6+ Rxb6 9.Rg4 Ra5 10.Rxh4 Rxa4 11.Rg3 Ra3 12.Rf3 Rb4 ³ (-0.40) Profondeur: 14/24 00:00:02 1786kN 4...f4+ 5.Rg4 b6 6.h4 f3 7.Rxf3 gxh4 8.cxb6+ Rxb6 9.Rg4 Ra5 10.Rxh4 Rxa4 11.Rg3 Ra3 12.Rf3 Rb4 µ (-0.80) Profondeur: 15/28 00:00:03 2631kN 4...f4+ 5.Rg4 b6 6.h4 gxh4 7.cxb6+ Rxb6 8.Rxh4 Ra5 9.Rg4 Rxa4 10.Rxf4 Rb3 11.Rf3 Rc4 12.Re3 Rc3 13.Re2 Rxd4 µ (-1.30) Profondeur: 15/28 00:00:03 3024kN 4...f4+ 5.Rg4 b6 6.h4 gxh4 7.cxb6+ Rxb6 8.Rxh4 Ra5 9.Rg4 Rxa4 10.Rxf4 Rb3 11.Rf3 Rc4 12.Re3 Rc3 13.Re2 Rxd4 µ (-1.30) Profondeur: 16/30 00:00:04 4152kN 4...f4+ 5.Rg4 b6 6.h4 gxh4 7.cxb6+ Rxb6 8.Rxh4 Ra5 9.Rg4 Rxa4 10.Rxf4 Rb3 11.Rf3 Rc4 12.Re3 Rc3 13.Re2 Rxd4 -+ (-1.70) Profondeur: 17/33 00:00:06 6064kN 4...f4+ 5.Rg4 b6 6.h4 gxh4 7.Rxh4 bxc5 8.Rg4 c4 9.Rxf4 Rb6 10.Re3 Ra5 11.Rd2 Rxa4 12.Rc2 Rb4 13.Rb2 c3+ 14.Rc2 -+ (-1.90) Profondeur: 17/33 00:00:07 7322kN 4...f4+ 5.Rg4 b6 6.h4 gxh4 7.cxb6+ Rxb6 8.Rxh4 Ra5 9.Rg4 Rxa4 10.Rxf4 Rb3 11.Rf3 Rc4 12.Re2 Rxd4 13.Rd2 Rc4 14.Rc2 d4 -+ (-1.86) Profondeur: 18/36 00:00:10 11043kN 4...f4+ 5.Rg4 b6 6.h4 gxh4 7.cxb6+ Rxb6 8.Rxh4 Ra5 9.Rg4 Rxa4 10.Rxf4 Rb3 11.Rf3 Rc4 12.Re2 Rxd4 13.Rd2 Rc4 14.Rc2 d4 -+ (-2.26) Profondeur: 19/39 00:00:16 18449kN 4...f4+ 5.Rg4 b6 6.h4 gxh4 7.Rxh4 bxc5 8.Rg4 c4 9.Rxf4 Rb6 10.Re3 Ra5 11.Rd2 Rxa4 12.Rc2 Rb4 13.Rd2 Rb3 14.Re3 c3 -+ (-2.88) Profondeur: 19/39 00:00:20 23290kN 4...f4+ 5.Rg4 b6 6.h4 gxh4 7.Rxh4 bxc5 8.Rg4 c4 9.Rxf4 Rb6 10.Re3 Ra5 11.Rd2 Rxa4 12.Rc2 Rb4 13.Rd2 Rb3 14.Re2 c3 15.Rd3 -+ (-2.88) Profondeur: 20/44 00:00:31 37663kN 4...b6 5.cxb6+ Rxb6 6.h4 f4+ 7.Rg4 gxh4 8.Rxh4 Ra5 9.Rh3 Rxa4 10.Rg4 Rb4 11.Rxf4 Rb3 12.Rf5 Rc3 13.Re6 Rxd4 14.Rd6 Re4 15.Rc5 d4 16.Rc4 -+ (-2.96) Profondeur: 20/44 00:00:58 69668kN 4...b6 5.cxb6+ Rxb6 6.h4 f4+ 7.Rg4 gxh4 8.Rxh4 Ra5 9.Rg4 Rxa4 10.Rxf4 Rb3 11.Rf3 Rc4 12.Re2 Rxd4 13.Rd2 Re4 14.Re2 d4 15.Rd2 d3 16.Re1 Re3 -+ (-2.74) Profondeur: 21/47 00:01:12 87850kN 4...b6 5.cxb6+ Rxb6 6.h4 f4+ 7.Rg4 gxh4 8.Rxh4 Ra5 9.Rg4 Rxa4 10.Rxf4 Rb3 11.Rf3 Rc4 12.Re2 Rxd4 13.Rd2 Re4 14.Re2 d4 15.Rd2 d3 16.Re1 Re3 17.Rf1 -+ (-2.74) Profondeur: 22/49 00:02:22 171538kN 4...b6 5.cxb6+ Rxb6 6.h4 f4+ 7.Rg4 gxh4 8.Rxh4 Ra5 9.Rg4 Rxa4 10.Rxf4 Rb3 11.Rf3 Rc4 12.Re2 Rxd4 13.Rd2 Re4 14.Re2 d4 15.Rd2 d3 16.Re1 Re3 17.Rf1 -+ (-3.14) Profondeur: 23/49 00:05:21 370420kN 4...b6 5.cxb6+ Rxb6 6.h4 f4+ 7.Rg4 gxh4 8.Rxh4 Ra5 9.Rg4 Rxa4 10.Rxf4 Rb3 11.Rf3 Rc4 12.Re3 Rc3 13.Re2 Rxd4 14.Rd2 Re4 -+ (-2.74) Profondeur: 23/49 00:05:52 412221kN 4...b6 5.cxb6+ Rxb6 6.h4 f4+ 7.Rg4 gxh4 8.Rxh4 Ra5 9.Rg4 Rxa4 10.Rxf4 Rb3 11.Rf3 Rc4 12.Re3 Rc3 13.Re2 Rxd4 14.Rd2 Re4 -+ (-3.14) Profondeur: 24/54 00:13:09 904715kN > >> >>[D]8/2k5/1p6/2Pp4/P2P3p/5K2/8/8 w - - 0 1 >> >>Analysis by Crafty 19.19: >> >>1. -+ (-6.69): 8.cxb6+ Rxb6 9.Rg4 Ra5 10.Rxh4 Rxa4 11.Rg4 Rb3 12.Rf3 Rc4 13.Re3 >>Rc3 14.Re2 Rxd4 15.Rd2 Re4 16.Re2 d4 17.Rf2 Rd3 >>2. -+ (-10.70): 8.c6 Rxc6 9.Rg4 b5 10.axb5+ Rxb5 11.Rxh4 Rc4 12.Rh5 Rxd4 13.Rg4 >>Re3 14.Rf5 d4 15.Re5 d3 16.Rd5 d2 17.Re5 d1D 18.Re6
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