Author: John Merlino
Date: 10:16:06 06/21/04
Go up one level in this thread
On June 21, 2004 at 10:57:21, Jaime Benito de Valle Ruiz wrote: >In this position, engines such as Crafty or Fruit need to reach depths of about >13 (15-30 secs on an Athlon 1800+) before they find the winning, while many >other (even amateur) engines show very high scores from depth 1: > >[d]7k/6p1/1p6/p2Q4/2P1qPKP/8/8/8 b - - 0 50 > >After the queen exchange this is the position: > >[d]7k/6p1/1p6/p2P4/5PKP/8/8/8 b - - 0 51 > >White cannot stop the passed pawn on a, but the black king can stop the d-one. >Why some evals work better than others here? > >Jaime CM_SKR on an AMD 2500+ shows a winning score for Black instantly: Time Depth Score Positions Moves 0:00 1/3 -4.65 1272 50...Qxd5 51.cxd5 Kg8 52.Kf5 a4 53.d6 Kf7 54.Ke5 0:00 1/4 -4.53 3673 50...Qxd5 51.cxd5 Kg8 52.Kf5 a4 53.Ke6 Kf8 54.Kd7 a3 0:00 1/5 -4.39 12160 50...Qxd5 51.cxd5 Kg8 52.Kf5 a4 53.Ke6 Kf8 54.Kd7 a3 55.d6 0:00 1/6 -4.59 36314 50...Qxd5 51.cxd5 Kg8 52.Kf5 a4 53.Ke6 Kf8 54.Kd7 a3 55.d6 a2 0:00 1/7 -4.62 41996 50...Qxd5 51.cxd5 Kg8 52.Kf5 a4 53.d6 Kf7 54.d7 Ke7 55.Kg6 Kxd7 56.Kxg7 b5 0:00 1/8 -4.44 51611 50...Qxd5 51.cxd5 Kg8 52.Kf5 a4 53.d6 Kf7 54.d7 Ke7 55.Kg6 a3 56.Kxg7 a2 57.d8=Q+ Kxd8 0:00 1/9 -4.62 89840 50...Qxd5 51.cxd5 Kg8 52.Kf5 a4 53.Ke6 Kf8 54.d6 Ke8 55.d7+ Kd8 56.Kf7 b5 57.Kxg7 Kxd7 0:00 1/10 -5.23 141905 50...Qxd5 51.cxd5 Kg8 52.Kf5 a4 53.Ke6 Kf8 54.d6 Ke8 55.Kd5 a3 56.Kc6 Kd8 57.Kxb6 Kd7 0:00 2/11 -4.70 235300 50...Qxd5 51.cxd5 Kg8 52.Kf5 a4 53.Ke6 Kf8 54.d6 Ke8 55.f5 a3 56.f6 gxf6 57.h5 a2 58.d7+ Kd8 0:02 3/12 -6.78 852244 50...Qxd5 51.cxd5 Kg8 52.Kf5 a4 53.Ke6 Kf8 54.d6 Ke8 55.Kd5 a3 56.Kc6 Kd8 57.Kxb6 a2 58.Kc6 a1=Q 0:06 4/13 -6.69 1902162 50...Qxd5 51.cxd5 Kg8 52.Kf5 a4 53.Ke6 Kf8 54.d6 Ke8 55.f5 a3 56.d7+ Kd8 57.Kf7 a2 58.Kxg7 a1=Q+ 59.f6 Qg1+ 60.Kf7 Kxd7 61.h5 0:18 5/14 -7.02 5444056 50...Qxd5 51.cxd5 Kg8 52.Kf5 a4 53.Ke6 Kf8 54.d6 Ke8 55.f5 a3 56.d7+ Kd8 57.Kf7 a2 58.Kxg7 a1=Q+ 59.f6 Qg1+ 60.Kh7 Kxd7 61.h5 Qg5 0:57 6/15 -7.32 16982570 50...Qxd5 51.cxd5 Kg8 52.Kf5 a4 53.Ke6 Kf8 54.d6 Ke8 55.f5 a3 56.d7+ Kd8 57.Kf7 a2 58.Kxg7 a1=Q+ 59.f6 Qg1+ 60.Kf7 Qg4 61.Kf8 Qxd7 62.f7 2:37 7/16 -7.88 47048644 50...Qxd5 51.cxd5 Kg8 52.Kf5 a4 53.Ke6 Kf8 54.d6 Ke8 55.d7+ Kd8 56.h5 a3 57.Kf7 a2 58.Kxg7 a1=Q+ 59.Kg6 Qg1+ 60.Kf7 Qg4 61.h6 Qxf4+ 62.Kg6 Qg4+ 63.Kf7 Qxd7+ 64.Kg8 jm
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