Author: Kurt Utzinger
Date: 00:42:00 12/23/01
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You may have right in so far that Crafty needs more time than other programs to see that Black's position is lost. But it's by no means so that Crafty does not know the position. Below the analysis of Crafty 18.12 and Crafty 17.14 which is in my opinion the strongest Crafty version and also faster in this end game position: New position [D] 8/8/8/1P6/2P3r1/3K4/P6k/8 b - - 0 1 Analysis by Crafty 18.12 on Ath 1.4/256 32 HT: 82...Rg2 -+ (-1.51) Depth: 1/3 00:00:00 82...Rg3+ 83.Kd4 Ra3 84.b6 Rxa2 -+ (-1.46) Depth: 3/6 00:00:00 82...Rg3+ 83.Kd4 Ra3 84.b6 Rxa2 -+ (-1.46) Depth: 3/6 00:00:00 82...Rg3+ 83.Kd4 Ra3 84.b6 Rxa2 -+ (-1.46) Depth: 3/6 00:00:00 82...Rg3+ 83.Kd4 Ra3 84.b6 Rxa2 -+ (-1.46) Depth: 4/7 00:00:00 82...Rg3+ 83.Kd4 Rg2 84.a4 Ra2 85.b6 Rxa4 -+ (-1.46) Depth: 5/9 00:00:00 82...Rg3+ 83.Kc2 Rg2+ 84.Kb3 Rg1 85.c5 Rb1+ 86.Kc4 Rb2 µ (-1.22) Depth: 6/11 00:00:00 27kN, tb=8 82...Rg2 83.c5 Rxa2 84.c6 Ra3+ 85.Kc4 Kg2 µ (-1.30) Depth: 6/11 00:00:00 46kN, tb=9 82...Rg2 83.b6 Rb2 84.c5 Rb5 85.Kd4 Rb2 ³ (-0.53) Depth: 7/13 00:00:00 87kN, tb=22 82...Rg3+ 83.Ke4 Rc3 84.Kd5 Rd3+ 85.Kc6 Rd4 86.c5 Rd2 µ (-1.25) Depth: 7/13 00:00:00 112kN, tb=23 82...Rg3+ 83.Ke4 Rg2 84.b6 Rxa2 85.c5 Rb2 86.Kd5 Kg2 µ (-1.32) Depth: 8/15 00:00:00 198kN, tb=39 82...Rg3+ 83.Kd4 Ra3 84.b6 Ra4 85.Kc3 Ra6 86.c5 Ra3+ 87.Kb2 Rd3 ³ (-0.48) Depth: 9/17 00:00:01 861kN, tb=67 82...Rg3+ 83.Kd4 Rg2 84.b6 Rd2+ 85.Kc3 Rd1 86.a4 Kg2 87.c5 Rc1+ 88.Kd4 Kf2 = (-0.25) Depth: 10/19 00:00:01 1483kN, tb=170 82...Rg3+ 83.Kd4 Rg2 84.b6 Rd2+ 85.Kc3 Rd1 86.a4 Rc1+ 87.Kd4 Kg3 88.c5 Rd1+ 89.Kc4 Kf2 = (-0.06) Depth: 11/21 00:00:03 2839kN, tb=364 82...Rg3+ 83.Kd4 Rg6 84.Kd5 Kg2 85.c5 Rg5+ 86.Kd6 Rg6+ 87.Kd5 = (0.00) Depth: 12/23 00:00:06 6352kN, tb=931 82...Rg3+ 83.Kd4 Rg6 84.Kd5 Kg2 85.c5 Rg5+ 86.Kd6 Rg6+ 87.Kd5 = (0.00) Depth: 13/25 00:00:11 11333kN, tb=1771 82...Rg3+ 83.Kd4 Rg4+ 84.Kc5 Rg5+ 85.Kb4 Rg4 86.a4 Rg1 87.a5 Rb1+ 88.Kc5 Ra1 89.a6 Ra4 ² (0.31) Depth: 14/26 00:00:54 54232kN, tb=5285 82...Rg3+ 83.Kd4 Rg2 84.b6 Rxa2 85.Kc5 Rb2 86.Kc6 Re2 87.c5 Rf2 88.b7 Rf6+ 89.Kd5 Rf5+ 90.Kd6 Rf8 91.c6 Rb8 ² (0.69) Depth: 15/30 00:02:14 132252kN, tb=17317 82...Kg3 83.b6 Kf4 84.a4 Ke5 85.a5 Rg3+ 86.Kd2 Kd6 87.a6 Ra3 88.a7 Kc6 89.c5 Kb7 90.Kc2 Ra4 ² (0.57) Depth: 15/30 00:02:27 145168kN, tb=20594 82...Kg3 83.b6 Kf4 84.Kd4 Kf3+ 85.Kd5 Rg5+ 86.Kc6 Rg6+ 87.Kb5 Rg2 88.b7 Rxa2 89.c5 Rb2+ 90.Kc6 Ke3 91.Kc7 Kd4 92.c6 Kc5 ± (1.34) Depth: 16/33 00:08:12 489225kN, tb=50501 (Utzinger, MyTown 23.12.2001) New position 8/8/8/1P6/2P3r1/3K4/P6k/8 b - - 0 1 Analysis by Crafty 17.14 on Ath 1.4/256 32 HT: 82...Rg2 ³ (-0.30) Depth: 1/2 00:00:00 82...Rg2 83.a4 ² (0.28) Depth: 2/3 00:00:00 82...Rg3+ = (-0.12) Depth: 2/3 00:00:00 82...Rg3+ 83.Kd4 Rg2 = (-0.20) Depth: 2/3 00:00:00 82...Rg3+ 83.Kc2 Rg2+ 84.Kb3 Kg3 ³ (-0.35) Depth: 3/6 00:00:00 82...Rg3+ 83.Kc2 Ra3 84.Kb2 Rd3 ³ (-0.29) Depth: 4/7 00:00:00 82...Rg3+ 83.Kc2 Rg2+ 84.Kb3 Kg3 85.b6 Kf2 = (0.05) Depth: 5/8 00:00:00 82...Rg2 ³ (-0.35) Depth: 5/8 00:00:00 82...Rg2 83.b6 Rxa2 84.c5 Kg3 ³ (-0.38) Depth: 5/8 00:00:00 82...Rg2 83.b6 Rxa2 84.c5 Ra3+ 85.Kc4 Kg3 = (-0.23) Depth: 6/11 00:00:00 16kN, tb=8 82...Rg2 83.b6 Rxa2 84.b7 Rb2 85.b8R = (0.01) Depth: 7/11 00:00:00 47kN, tb=21 82...Rg3+ 83.Kd4 Ra3 84.c5 Ra4+ 85.Kd5 Rxa2 86.b6 Kg3 = (-0.16) Depth: 7/11 00:00:00 108kN, tb=22 82...Rg3+ 83.Kd4 Ra3 84.c5 Rxa2 85.b6 Rb2 86.Kd5 = (-0.13) Depth: 8/13 00:00:00 253kN, tb=37 82...Rg3+ 83.Kc2 Kg1 84.Kb2 Rg2+ 85.Kb3 Kf2 86.a4 Ke3 87.b6 Kd4 = (0.13) Depth: 9/15 00:00:01 745kN, tb=89 82...Rg3+ 83.Kc2 Kg1 84.Kb2 Rg6 85.a4 Kf2 86.Kc3 Ke3 87.c5 Re6 = (0.08) Depth: 10/17 00:00:01 1369kN, tb=305 82...Rg3+ 83.Kc2 Kg2 84.Kb2 Kf3 85.b6 Ke4 86.a4 Kd4 ² (0.33) Depth: 11/19 00:00:03 2896kN, tb=534 82...Rg3+ 83.Kc2 Kg2 84.Kb2 Kf3 85.a4 Ke4 86.c5 Rg7 87.c6 Kd5 88.a5 Rc7 = (0.14) Depth: 12/19 00:00:06 5467kN, tb=1165 82...Rg3+ 83.Kc2 Kg2 84.Kb2 Kf3 85.a4 Ke4 86.c5 Kd4 87.c6 Rc3 88.Ka2 Rc2+ 89.Kb3 Rd2 ² (0.29) Depth: 13/21 00:00:11 10414kN, tb=1678 82...Rg3+ 83.Kd4 Rg4+ 84.Kc5 Rg5+ 85.Kb4 Rg2 86.a4 Kg3 87.a5 Kf3 88.a6 Rb2+ 89.Kc3 Ra2 90.c5 Ke4 ± (1.00) Depth: 14/23 00:01:05 65558kN, tb=7958 82...Rg3+ 83.Kd4 Rg4+ 84.Kc5 Rg5+ 85.Kb4 Rg2 86.a4 Kg3 87.a5 Rb2+ 88.Kc5 Ra2 89.a6 Ra4 90.Kd6 Kf2 91.c5 ± (1.27) Depth: 15/27 00:01:30 90687kN, tb=13500 82...Rg3+ 83.Kd4 Rg4+ 84.Kc5 Rg5+ 85.Kb4 Kg3 86.a4 Kf4 87.b6 Ke5 88.a5 Kd6 89.c5+ Kc6 90.a6 Rg8 91.a7 Ra8 92.Kc4 +- (1.72) Depth: 16/27 00:03:24 206852kN, tb=30917 (Utzinger, MyTown 23.12.2001)
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