Author: m.d.hurd
Date: 12:58:17 06/07/05
Go up one level in this thread
On June 07, 2005 at 15:03:13, Christos Gitsis wrote: >This position from one of my games is winning for white. >It is not a usual test position, because there are many moves (probably most of >the moves) that lead to a win. > >[D] 8/6p1/4p2p/5p2/2k5/P4P2/1K4PP/8 w - - 0 43 > >All human club players should know that the outside passed a-pawn is very >strong. It forces the black King to stay on the Queenside, allowing the white >King to reach the Kingside first. > >Yet some strong engines don't evaluate the position correctly. Some give a very >small advantage to white and others even give a score favouring Black. The most >optimistic engines that I tried are Crafty and Zappa with a score of only +1.0 >to +1.2. > >Isn't it relatively easy to add knowledge about outside passed pawns, so that >the engines would evaluate this position correctly? 14/19 0:01 -0.01 1.Kc2 e5 2.h4 Kb5 3.h5 Ka4 4.g4 Kxa3 5.gxf5 Kb4 6.Kd3 Kc5 7.Ke4 Kd6 (386.483) 257 14/19 0:01 0.00++ 1.h3 (417.579) 270 14/19 0:01 +0.01 1.h3 e5 2.Kc2 Kb5 3.Kb3 g5 4.g4 f4 (468.366) 288 14/20 0:01 +0.02++ 1.f4 (546.436) 291 14/20 0:01 +0.14 1.f4 g5 2.g3 gxf4 3.gxf4 h5 4.Kc2 Kd4 5.h4 e5 6.fxe5 Kxe5 7.a4 f4 8.a5 Kd5 (560.835) 296 15/21 0:02 +0.39++ 1.f4 g5 (639.605) 307 15/21 0:02 +0.45 1.f4 g5 2.g3 gxf4 3.gxf4 h5 4.Kc2 Kd4 5.Kd2 h4 6.h3 e5 7.fxe5 Kd5 8.Ke3 Kxe5 (661.694) 313 16/30 0:02 +0.49 1.f4 g5 2.g3 Kd4 3.a4 Kc4 4.fxg5 hxg5 5.a5 Kb5 6.a6 Kxa6 7.h3 Kb5 (899.211) 359 17/35 0:03 +0.72 1.f4 g5 2.g3 Kd4 3.Kc2 Kc4 4.Kd2 gxf4 5.gxf4 h5 6.Ke3 h4 7.h3 Kb3 8.Kd4 Kxa3 9.Ke5 Kb4 (1.267.086) 352 18/36 0:04 +0.72 1.f4 g5 2.g3 Kd4 3.Kc2 gxf4 4.gxf4 h5 5.Kd2 h4 6.h3 Kc4 7.Ke3 Kb3 8.Kd4 Kxa3 9.Ke5 Kb4 10.Kxe6 (1.754.656) 354 19/40 0:08 +0.97++ 1.f4 g5 (3.527.084) 407 19/40 0:08 +0.97 1.f4 g5 2.g3 Kd4 3.a4 e5 (3.749.675) 419 20/41 0:11 +0.76 1.f4 g5 2.g3 e5 3.fxe5 Kd5 4.Kc3 Kxe5 5.a4 Kd5 6.a5 Kc5 7.a6 Kb6 8.Kd4 Kxa6 9.Ke5 Ka5 10.Kxf5 Kb4 (5.674.867) 479 21/39 0:17 +0.76 1.f4 g5 2.g3 e5 3.fxe5 Kd5 4.Kc3 Kxe5 5.a4 Kd5 6.a5 Kc5 7.a6 Kb6 8.Kd4 Kxa6 9.Ke5 Ka5 10.Kxf5 Kb4 (9.852.902) 560 22/41 0:28 +0.86 1.f4 g5 2.g3 e5 3.fxe5 Kd5 4.Kc3 Kxe5 5.a4 Kd5 6.a5 Kc5 7.a6 Kb6 8.Kd4 Kxa6 9.Ke5 f4 10.gxf4 gxf4 11.Kxf4 Kb5 12.h4 (17.293.144) 603 23/45 0:43 +0.62 1.f4 g5 2.g3 e5 3.fxe5 Kd5 4.Kc3 Kxe5 5.a4 Kd5 6.a5 Kc5 7.a6 Kb6 8.Kd4 Kxa6 9.Ke5 f4 10.gxf4 gxf4 11.Kxf4 Kb5 12.h4 Kc4 (26.704.599) 619 24/46 1:55 +0.68 1.f4 g5 2.g3 e5 3.fxe5 Kd5 4.Kc3 Kxe5 5.a4 Kd5 6.a5 Kc5 7.a6 Kb6 8.Kd4 Kxa6 9.Ke5 f4 10.gxf4 gxf4 11.Kxf4 Kb5 12.Kf5 (76.887.465) 664 24/46 2:11 +0.69++ 1.h4 (86.551.066) 659 24/46 2:26 +1.04++ 1.h4 (97.804.345) 665 24/48 4:48 +1.04 1.h4 e5 (204.594.321) 708 25/48 5:28 +1.04 1.h4 e5 2.Kc2 g6 3.a4 Kd4 4.Kd2 Kc4 5.Ke2 Kc5 6.Ke3 Kc4 7.Kd2 h5 (229.449.721) 698 25/54 6:14 +1.05++ 1.f4 (259.019.711) 692 25/54 6:35 +1.17 1.f4 g5 2.g3 e5 3.fxe5 Kd5 4.Kc3 Kxe5 5.a4 Kd5 6.a5 (273.016.470) 690 26/50 8:00 +1.41 1.f4 e5 2.fxe5 Kd5 3.a4 Kxe5 4.a5 Kd5 5.Kc2 (323.990.261) 674 27/52 11:21 +1.58 1.f4 e5 2.fxe5 Kd5 3.a4 Kxe5 4.a5 Kd5 5.Kc2 Kc5 6.Kd3 g5 7.a6 Kb6 8.Kd4 f4 9.Ke5 Kxa6 10.h3 f3 11.gxf3 Kb5 (442.670.346) 649 28/57 18:03 +1.83++ 1.f4 e5 (687.756.227) 634 28/57 20:31 +2.33++ 1.f4 e5 (785.608.402) 637 28/57 25:27 +3.45 1.f4 e5 2.fxe5 Kd5 3.a4 Kxe5 4.a5 Kd5 5.Kc3 Kc5 6.a6 Kb6 7.Kd4 Kxa6 8.Ke5 f4 9.Kxf4 Kb5 10.Kf5 Kc4 (992.209.622) 649 29/56 34:31 +3.45 1.f4 e5 2.fxe5 Kd5 3.a4 Kxe5 4.a5 Kd5 5.Kc3 Kc5 6.a6 Kb6 7.Kd4 Kxa6 8.Ke5 f4 9.Kxf4 Kb5 10.Kf5 Kc4 (1.324.530.211) 639 Mike
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