Author: Uri Blass
Date: 06:58:11 11/17/05
Go up one level in this thread
On November 17, 2005 at 09:41:12, Uri Blass wrote: >On November 17, 2005 at 08:59:39, Bernhard Bauer wrote: > >>This pawn endgame has only 7 pieces. >>Yace shines bright in this type of position. >>Gambitfruit finds the right move early, but fails to give a high score. >>Running it for 15 min on a AMD XP 1800 MHz let it reach a depth of 31, >>but the score remains at 1.76. >>What's the reason? >>Kind regards >>Bernhard > >I do not know but I guess that some random move generator can get the correct >score even faster than yace if it is lucky > >Maybe yace is lucky >Note that even some plies after the root position after white lost a tempo >commercial Fruit does not see nothing at depth 36(white move by yace when black >moves by fruit) > >1.Ke4 Ke8 2.Ke3 Ke7 3.Kf3 Kd6 4.Ke4 Ke7 5.Ke5 > >New game, >[D]8/4k1p1/8/4KPp1/6P1/7P/8/8 b - - 0 1 > >Analysis by Fruit 2.2.1: > >5...Kd7 > +- (2.14) Depth: 1/1 00:00:00 >5...Kd7 6.Kd4 > +- (1.94) Depth: 2/3 00:00:00 >5...Kd7 6.Kd5 Ke7 > +- (2.14) Depth: 3/4 00:00:00 >5...Kd7 6.f6 Ke8 7.fxg7 Kf7 > +- (3.61) Depth: 4/6 00:00:00 >5...Kf7 6.Kd4 Ke7 7.Kd5 > +- (1.94) Depth: 4/7 00:00:00 >5...Kf7 6.Kd4 g6 7.Ke5 gxf5 8.gxf5 > +- (1.75) Depth: 5/7 00:00:00 >5...Kf7 6.Kd4 Kf6 7.Kd5 g6 8.fxg6 Kxg6 > +- (1.46) Depth: 6/8 00:00:00 1kN >5...Kf7 6.Kd4 Kf6 7.Kd5 Ke7 8.Kc5 Kf6 > +- (2.02) Depth: 7/9 00:00:00 2kN, tb=3 >5...Kf7 6.Kd6 Kf6 7.Kd5 g6 8.Ke4 Kf7 9.Ke5 gxf5 10.gxf5 > +- (1.75) Depth: 8/11 00:00:00 6kN, tb=5 >5...Kf7 6.Kd6 Kf6 7.Kd5 g6 8.Ke4 Kf7 9.Ke5 gxf5 10.gxf5 > +- (1.75) Depth: 9/11 00:00:00 8kN, tb=6 >5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kd4 Kd6 9.Kc4 Ke5 10.Kc5 > +- (1.58) Depth: 10/13 00:00:00 13kN, tb=6 >5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kd4 Kf7 9.Kc4 g6 10.Kd4 gxf5 11.gxf5 > +- (1.55) Depth: 11/15 00:00:00 21kN, tb=8 >5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc5 Ke8 9.Kd4 Kf7 10.Kc4 g6 11.Kd4 gxf5 12.gxf5 > +- (1.55) Depth: 12/15 00:00:00 31kN, tb=10 >5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc5 Ke8 9.Kd4 Kf7 10.Kc4 g6 11.Kd4 gxf5 12.gxf5 > +- (1.55) Depth: 13/17 00:00:01 48kN, tb=13 >5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kd4 Ke8 9.Kc5 Ke7 10.Kc4 Kf7 11.Kc3 g6 12.Kd4 gxf5 >13.gxf5 > +- (1.55) Depth: 14/19 00:00:01 73kN, tb=13 >5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kd4 Ke8 9.Kc5 Ke7 10.Kc4 Kf7 11.Kd3 g6 12.Kd4 gxf5 >13.gxf5 > +- (1.55) Depth: 15/19 00:00:01 96kN, tb=22 >5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kd4 Ke8 9.Kc5 Ke7 10.Kc4 Kf6 11.Kd3 Kf7 12.Kc3 g6 >13.Kd4 gxf5 14.gxf5 > +- (1.55) Depth: 16/22 00:00:01 129kN, tb=37 >5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc4 Kf6 9.Kd4 Ke7 10.Kc5 Ke8 11.Kc4 Kf7 12.Kd3 g6 >13.Kd4 gxf5 14.gxf5 > +- (1.55) Depth: 17/26 00:00:01 207kN, tb=74 >5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc4 Kf6 9.Kd4 Ke7 10.Kc5 Kf7 11.Kc6 Ke7 12.Kd5 Kf7 >13.Kc5 g6 14.Kd5 gxf5 15.gxf5 > +- (1.55) Depth: 18/28 00:00:01 317kN, tb=140 >5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc4 Kf6 9.Kd4 Ke7 10.Kc5 Ke8 11.Kc4 Ke7 12.Kd3 Kf7 >13.Kc3 g6 14.Kd4 gxf5 15.gxf5 > +- (1.55) Depth: 19/32 00:00:01 415kN, tb=345 >5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc4 Kf6 9.Kd4 Ke7 10.Kc5 Ke8 11.Kc4 Kf7 12.Kd3 Ke8 >13.Kc2 Kf7 14.Kc3 g6 15.Kd4 gxf5 16.gxf5 > +- (1.55) Depth: 20/33 00:00:01 499kN, tb=546 >5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc4 Kf6 9.Kd4 Ke7 10.Kc5 Ke8 11.Kc4 Kf7 12.Kd3 Ke8 >13.Kc2 Kf7 14.Kc3 g6 15.Kd4 gxf5 16.gxf5 > +- (1.55) Depth: 21/35 00:00:01 611kN, tb=732 >5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc4 Kf6 9.Kd4 Ke7 10.Kc5 Kf7 11.Kb6 Ke7 12.Ka5 Kf7 >13.Kb5 Ke8 14.Kc4 Kf7 15.Kc5 g6 16.Kd5 gxf5 17.gxf5 > +- (1.55) Depth: 22/39 00:00:01 911kN, tb=1080 >5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc4 Kf6 9.Kd4 Ke7 10.Kc5 Ke8 11.Kc4 Kf7 12.Kb5 Ke8 >13.Kc5 Ke7 14.Kd5 Kf7 15.Kc6 g6 16.Kd5 gxf5 17.gxf5 > +- (1.55) Depth: 23/39 00:00:02 1089kN, tb=1911 >5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc4 Kf6 9.Kd4 Ke7 10.Kc5 Ke8 11.Kc4 Kf7 12.Kd3 Ke8 >13.Ke2 Ke7 14.Kd2 Kf6 15.Kd3 Kf7 16.Kc3 g6 17.Kd4 gxf5 18.gxf5 > +- (1.55) Depth: 24/40 00:00:02 1402kN, tb=1957 >5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc4 Kf6 9.Kd4 Ke7 10.Kc5 Ke8 11.Kc4 Kf7 12.Kd3 Ke8 >13.Kc3 Ke7 14.Kd4 Kf6 15.Kc5 Kf7 16.Kc6 g6 17.Kd5 gxf5 18.gxf5 > +- (1.55) Depth: 25/43 00:00:02 1935kN, tb=2443 >5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc4 Kf6 9.Kd4 Ke7 10.Kc5 Ke8 11.Kc4 Kf7 12.Kb5 Ke8 >13.Kc6 Kf7 14.Kc7 Ke7 15.Kb6 Kf6 16.Kc5 Kf7 17.Kc6 g6 18.Kd5 gxf5 19.gxf5 > +- (1.55) Depth: 26/43 00:00:02 2708kN, tb=2971 >5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc4 Kf6 9.Kd4 Ke7 10.Kc5 Ke8 11.Kc4 Kf7 12.Kb5 Ke8 >13.Kc6 Kf7 14.Kd7 Kf8 15.Ke6 Ke8 16.Kd6 Kf7 17.Kc6 g6 18.Kd5 gxf5 19.gxf5 > +- (1.55) Depth: 27/48 00:00:05 6894kN, tb=4130 >5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc4 Kf6 9.Kd4 Ke7 10.Kc5 Ke8 11.Kc4 Kf7 12.Kb5 Ke8 >13.Kc5 Ke7 14.Kd4 Kf6 15.Kd3 Ke7 16.Ke2 Kf6 17.Kd2 Kf7 18.Kc3 g6 19.Kd4 gxf5 >20.gxf5 > +- (1.55) Depth: 28/48 00:00:07 9576kN, tb=4949 >5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc4 Kf6 9.Kd4 Ke7 10.Kc5 Ke8 11.Kc4 Kf7 12.Kb5 Ke8 >13.Kc6 Kf7 14.Kd7 Kf8 15.Kc7 Kf7 16.Kb7 Ke7 17.Kb6 Kf7 18.Kc6 g6 19.Kd5 gxf5 >20.gxf5 > +- (1.55) Depth: 29/50 00:00:08 11757kN, tb=5637 >5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc4 Kf6 9.Kd4 Ke7 10.Kc5 Ke8 11.Kc4 Kf7 12.Kb5 Ke8 >13.Kc6 Kf7 14.Kd7 Kf8 15.Kd6 Kf7 16.Kc7 Ke7 17.Kc8 Kf6 18.Kd7 Kf7 19.Kc6 g6 >20.Kd5 gxf5 21.gxf5 > +- (1.55) Depth: 30/53 00:00:10 14283kN, tb=6738 >5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc4 Kf6 9.Kd4 Ke7 10.Kc5 Ke8 11.Kc4 Kf7 12.Kc3 Ke8 >13.Kc2 Kf7 14.Kd2 Ke7 15.Ke2 Kf6 16.Kd3 Ke7 17.Kd4 Kf6 18.Kc5 Kf7 19.Kc6 g6 >20.Kd5 gxf5 21.gxf5 > +- (1.55) Depth: 31/54 00:00:14 20337kN, tb=7717 >5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc4 Kf6 9.Kd4 Ke7 10.Kc5 Ke8 11.Kc4 Kf7 12.Kc3 Ke8 >13.Kc2 Kf7 14.Kd3 Ke8 15.Ke2 Ke7 16.Kf1 Kf6 17.Kf2 Kf7 18.Kg3 g6 19.Kf3 Ke7 >20.Ke3 Kf7 21.Kd4 > +- (1.55) Depth: 32/55 00:00:21 29121kN, tb=10243 >5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc4 Kf6 9.Kd4 Ke7 10.Kc5 Ke8 11.Kc4 Kf7 12.Kb5 Ke8 >13.Kc6 Kf7 14.Kd7 Kf8 15.Kd6 Kf7 16.Kc7 Ke7 17.Kb7 Kf6 18.Kc8 Ke7 19.Kc7 Kf7 >20.Kc6 g6 21.Kd5 > +- (1.55) Depth: 33/55 00:00:27 37834kN, tb=11880 >5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc4 Kf6 9.Kd4 Ke7 10.Kc5 Ke8 11.Kc4 Kf7 12.Kb5 Ke8 >13.Kc6 Kf7 14.Kd7 Kf8 15.Kd6 Kf7 16.Kc6 Ke7 17.Kc7 Kf6 18.Kd7 Kf7 19.Kd8 Kf8 >20.Kc8 g6 21.Kc7 > +- (1.55) Depth: 34/57 00:00:37 52206kN, tb=13706 >5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc4 Kf6 9.Kd4 Ke7 10.Kc5 Ke8 11.Kc4 Kf7 12.Kc3 Ke8 >13.Kc2 Kf7 14.Kd3 Ke8 15.Kd2 Ke7 16.Ke3 Kf6 17.Kd3 Ke7 18.Kd4 Kf6 19.Kc3 Ke7 >20.Kd2 g6 21.Kd3 > +- (1.55) Depth: 35/58 00:00:48 70993kN, tb=15780 >5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc4 Kf6 9.Kd4 Ke7 10.Kc5 Ke8 11.Kc4 Kf7 12.Kc3 Ke8 >13.Kc2 Kf7 14.Kd3 Ke8 15.Kd2 Ke7 16.Ke1 Kf7 17.Ke2 Ke7 18.Kf1 Kf6 19.Kf2 Kf7 >20.Kg3 g6 21.Kf3 > +- (1.55) Depth: 36/67 00:01:13 109991kN, tb=20984 > >(, 17.11.2005) Note that history pruning is one of the reasons that fruit could not see the mate Fruit without history pruning New game, 8/4k1p1/8/4KPp1/6P1/7P/8/8 b - - 0 1 Analysis by Fruit 2.2.1: 5...Kd7 +- (2.14) Depth: 1/1 00:00:00 5...Kd7 6.Kd4 +- (1.94) Depth: 2/3 00:00:00 5...Kd7 6.Kd5 Ke7 +- (2.14) Depth: 3/4 00:00:00 5...Kd7 6.f6 Ke8 7.fxg7 Kf7 +- (3.61) Depth: 4/6 00:00:00 5...Kf7 6.Kd4 Ke7 7.Kd5 +- (1.94) Depth: 4/7 00:00:00 5...Kf7 6.Kd4 g6 7.Ke5 gxf5 8.gxf5 +- (1.75) Depth: 5/7 00:00:00 5...Kf7 6.Kd4 Kf6 7.Kd5 g6 8.fxg6 Kxg6 +- (1.46) Depth: 6/8 00:00:00 1kN 5...Kf7 6.Kd4 Kf6 7.Kd5 Ke7 8.Kc5 Kf6 +- (2.02) Depth: 7/9 00:00:00 3kN, tb=3 5...Kf7 6.Kd6 Kf6 7.Kd5 g6 8.Ke4 Kf7 9.Ke5 gxf5 10.gxf5 +- (1.75) Depth: 8/11 00:00:00 6kN, tb=5 5...Kf7 6.Kd6 Kf6 7.Kd5 g6 8.Ke4 Kf7 9.Ke5 gxf5 10.gxf5 +- (1.75) Depth: 9/12 00:00:01 9kN, tb=6 5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kd4 Kd6 9.Kc4 Ke5 10.Kc5 +- (1.58) Depth: 10/13 00:00:01 16kN, tb=6 5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kd4 Kf7 9.Kc4 g6 10.Kd4 gxf5 11.gxf5 +- (1.55) Depth: 11/15 00:00:01 26kN, tb=8 5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc5 Ke8 9.Kd4 Kf7 10.Kc4 g6 11.Kd4 gxf5 12.gxf5 +- (1.55) Depth: 12/15 00:00:01 40kN, tb=10 5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc5 Ke8 9.Kd4 Kf7 10.Kc4 g6 11.Kd4 gxf5 12.gxf5 +- (1.55) Depth: 13/16 00:00:01 65kN, tb=13 5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc5 Ke8 9.Kc4 Ke7 10.Kd4 Kf7 11.Kd3 g6 12.Kd4 gxf5 13.gxf5 +- (1.55) Depth: 14/18 00:00:01 96kN, tb=13 5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc5 Ke8 9.Kc4 Ke7 10.Kd4 Kf7 11.Kd3 g6 12.Kd4 gxf5 13.gxf5 +- (1.55) Depth: 15/19 00:00:01 136kN, tb=23 5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc5 Ke8 9.Kc4 Kf7 10.Kd3 Ke7 11.Kd4 Kf7 12.Kc4 g6 13.Kd4 gxf5 14.gxf5 +- (1.55) Depth: 16/21 00:00:01 182kN, tb=37 5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc5 Ke8 9.Kc4 Kf7 10.Kd3 Ke7 11.Kd4 Kf7 12.Kc4 g6 13.Kd5 gxf5 14.gxf5 +- (1.55) Depth: 17/23 00:00:01 233kN, tb=130 5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc5 Ke8 9.Kc4 Kf7 10.Kd3 Ke7 11.Ke3 Kf6 12.Kd2 Kf7 13.Kc3 g6 14.Kd4 gxf5 15.gxf5 +- (1.55) Depth: 18/25 00:00:01 313kN, tb=279 5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc5 Ke8 9.Kc4 Kf7 10.Kd3 Ke7 11.Ke3 Kf6 12.Kd2 Kf7 13.Kc3 g6 14.Kd4 gxf5 15.gxf5 +- (1.55) Depth: 19/29 00:00:01 448kN, tb=549 5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc4 Kf6 9.Kd4 Ke7 10.Kd5 Kf7 11.Kc5 Ke7 12.Kb4 Kf6 13.Kb5 Kf7 14.Kc6 g6 15.Kd5 gxf5 16.gxf5 +- (1.55) Depth: 20/32 00:00:01 1006kN, tb=810 5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc6 Ke8 9.Kd6 Kf8 10.Kc5 Ke7 11.Kd5 Kf7 12.Kd4 Ke7 13.Kd3 Kf7 14.Kc4 g6 15.Kd5 gxf5 16.gxf5 +- (1.55) Depth: 21/35 00:00:01 2293kN, tb=1210 5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc6 Kf6 9.Kd6 Kf7 10.Kd7 Kf8 11.Kc6 Kf7 12.Kc5 Ke7 13.Kc4 Kf6 14.Kd4 Kf7 15.Kd3 g6 16.Ke4 gxf5+ 17.gxf5 +- (1.55) Depth: 22/38 00:00:02 3036kN, tb=1728 5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc6 Kf6 9.Kd6 Kf7 10.Kd7 Kf8 11.Kc6 Ke7 12.Kc7 Kf6 13.Kb6 Ke7 14.Kc5 Kf7 15.Kc4 g6 16.Kd4 gxf5 17.gxf5 +- (1.55) Depth: 23/43 00:00:02 3462kN, tb=2188 5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc6 Kf6 9.Kd6 Kf7 10.Kd7 Kf8 11.Kc6 Ke7 12.Kd5 Kd7 13.Kc5 Ke7 14.Kd4 Ke8 15.Kc4 Kf7 16.Kd3 g6 17.Ke4 gxf5+ 18.gxf5 +- (1.55) Depth: 24/43 00:00:03 4120kN, tb=3435 5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc6 Kf6 9.Kd6 Kf7 10.Kd7 Kf8 11.Kc6 Ke7 12.Kd5 Kd7 13.Kc5 Ke7 14.Kd4 Kf6 15.Kd3 Kf7 16.Kc3 g6 17.Kd4 gxf5 18.gxf5 +- (1.55) Depth: 25/54 00:00:04 5313kN, tb=4586 5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc6 Kf6 9.Kd6 Kf7 10.Kd7 Kf8 11.Kc6 Ke7 12.Kd5 Kd7 13.Kc5 Kc7 14.Kd4 Kd6 15.Kc3 Ke7 16.Kc4 Kf7 17.Kc5 g6 18.Kd5 gxf5 19.gxf5 +- (1.55) Depth: 26/57 00:00:06 7898kN, tb=4847 5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc6 Kf6 9.Kd6 Kf7 10.Kd7 Kf8 11.Kc6 Ke7 12.Kd5 Kd7 13.Kc5 Kc7 14.Kd4 Kd6 15.Kd3 Ke7 16.Kc2 Kf7 17.Kc3 g6 18.Kd4 gxf5 19.gxf5 +- (1.55) Depth: 27/58 00:00:10 14835kN, tb=6463 5...Kf7 6.Kd6 Kf6 7.Kd5 Ke7 8.Kc6 Kf6 9.Kd6 Kf7 10.Kd7 Kf8 11.Kc6 Ke7 12.Kc5 Kf7 13.Kc4 Kf6 14.Kd4 Ke7 15.Kd3 Kf6 16.Kc4 Ke7 17.Kd5 Kf7 18.Kc5 g6 19.Kd5 gxf5 20.gxf5 +- (1.55) Depth: 28/58 00:00:13 19646kN, tb=7497 5...Kf7 6.Kd5 Ke7 7.Kc6 Kf6 8.Kd6 Kf7 9.Kd7 Kf8 10.Ke6 Ke8 11.f6 g6 12.f7+ Kf8 13.Kd6 Kxf7 14.Kd7 Kf6 15.Ke8 Kg7 16.Ke7 Kh7 17.Kf7 Kh6 18.Kf6 Kh7 19.Kxg5 +- (#30) Depth: 29/60 00:03:18 269992kN, tb=19486 (, 17.11.2005) Note that fruit probably cannot see it even with no pruning from the root position in a reasonable time because as you can see the capture that leads to KPP vs KP tablebases endgame happen only after 37 plies from the root position so asking it to find it at depth that is smaller than depth 37 is probably impossible. I also guess that some other pruning may be a problem for fruit to find it because sacrificing f7 is a clear candidate to prune as illogical move. Uri
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