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Subject: Re: Endgame test position - avoid Kc4?

Author: Richard Pijl

Date: 01:13:54 03/25/05

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On March 25, 2005 at 03:17:52, Martin Baumung wrote:

>Hi everyone,
>
>here's an endgame position taken from a game between Shredder 9 and Gandalf
>6.01.
>
>[D]b7/P6p/5Kp1/1k4P1/7P/2p1B3/8/8 b - - 1 76
>
>Gandalf played 76...Kc4? and lost.
>
>Interestingly many other engines like this move as well.
>

The Baron 1.6.0 on a Xeon 2.8 (100Mb hash, 5men EGTB) switches to Be4 after 7.6
seconds and sticks to it with a stable score:

 ply       time        nodes   score  pv
  9(14).   0:00.20    124843   -0.20  Kb5-c4 Kf6-g7 Kc4-d3 Be3-c1 Kd3-c2
                                      Bc1-f4 Ba8-e4 Kg7xh7 Kc2-b2
 10(15)&   0:00.31    193013   -0.21  Kb5-c4 Kf6-g7 Kc4-d3 Be3-f4 Kd3-e4
                                      Bf4-c1 Ke4-d3 Kg7xh7 Ba8-e4 a7-a8Q
(Be4xa8)
                                      (Kh7xg6)
 10(15).   0:00.45    291043   -0.21  Kb5-c4 Kf6-g7 Kc4-d3 Be3-f4 Kd3-e4
                                      Bf4-c1 Ke4-d3 Kg7xh7 Ba8-e4 a7-a8Q
(Be4xa8)
                                      (Kh7xg6)
 11(19)&   0:00.69    419425   -0.26  Kb5-c4 Kf6-g7 Kc4-d3 Be3-f4 Kd3-e4
                                      Bf4-c1 Ba8-d5 Kg7xh7 Ke4-f5 Kh7-g7 c3-c2
                                      Bc1-e3
 11(19).   0:01.20    756789   -0.26  Kb5-c4 Kf6-g7 Kc4-d3 Be3-f4 Kd3-e4
                                      Bf4-c1 Ba8-d5 Kg7xh7 Ke4-f5 Kh7-g7 c3-c2
                                      Bc1-e3
 12(17)&   0:01.59    988591   -0.22  Kb5-c4 Kf6-g7 Kc4-d3 Be3-f4 Kd3-e4
                                      Bf4-c1 Ke4-f5 Kg7xh7 Ba8-e4 h4-h5 g6xh5
                                      g5-g6
 12(17).   0:02.03   1223209   -0.22  Kb5-c4 Kf6-g7 Kc4-d3 Be3-f4 Kd3-e4
                                      Bf4-c1 Ke4-f5 Kg7xh7 Ba8-e4 h4-h5 g6xh5
                                      g5-g6
 13(21)&   0:03.55   1876186   -0.43  Kb5-c4 Kf6-g7 Kc4-d3 Be3-f4 Ba8-e4
                                      Kg7xh7 Kd3-e2 a7-a8R Be4xa8 Kh7xg6 c3-c2
                                      h4-h5 Ke2-d1 h5-h6
 13(21)&   0:07.58   3884905   -0.26  Ba8-e4 Kf6-g7 Kb5-a6 Kg7xh7 Ka6-b7
                                      Kh7-g7 Kb7-a8 Kg7-f6 c3-c2 Kf6-e5 Be4-d3
                                      Ke5-d6 Bd3-c4 Kd6-c7
 13(21).   0:08.23   4290716   -0.26  Ba8-e4 Kf6-g7 Kb5-a6 Kg7xh7 Ka6-b7
                                      Kh7-g7 Kb7-a8 Kg7-f6 c3-c2 Kf6-e5 Be4-d3
                                      Ke5-d6 Bd3-c4 Kd6-c7
 14(21)&   0:11.77   5592441   -0.26  Ba8-e4 Kf6-g7 Kb5-a6 Kg7xh7 Ka6-b7
                                      Kh7-g7 Kb7-a8 Kg7-f6 c3-c2 Kf6-e5 Be4-d3
                                      Ke5-d6 Bd3-c4 Kd6-c7 c2-c1Q (Be3xc1)
 14(21).   0:13.45   6467779   -0.26  Ba8-e4 Kf6-g7 Kb5-a6 Kg7xh7 Ka6-b7
                                      Kh7-g7 Kb7-a8 Kg7-f6 c3-c2 Kf6-e5 Be4-d3
                                      Ke5-d6 Bd3-c4 Kd6-c7 c2-c1Q (Be3xc1)
 15(22)&   0:18.80   8001779   -0.26  Ba8-e4 Kf6-g7 Kb5-a6 Kg7xh7 Ka6-b7
                                      Kh7-g7 Kb7-a8 Kg7-f6 c3-c2 Kf6-e5 Be4-d3
                                      Ke5-d4 Bd3-f5 Kd4-d5 Bf5-d3 Kd5-c6
 15(22).   0:21.86   9306996   -0.26  Ba8-e4 Kf6-g7 Kb5-a6 Kg7xh7 Ka6-b7
                                      Kh7-g7 Kb7-a8 Kg7-f6 c3-c2 Kf6-e5 Be4-d3
                                      Ke5-d4 Bd3-f5 Kd4-d5 Bf5-d3 Kd5-c6
 16(24)&   0:40.02  13729155   -0.25  Ba8-e4 Kf6-g7 Kb5-a6 Kg7xh7 Ka6-b7
                                      Kh7-g7 Kb7-a8 Kg7-f6 c3-c2 Kf6-e5 Be4-d3
                                      Ke5-d4 Bd3-f5 Kd4-d5 Bf5-d3 Kd5-e6 Bd3-c4
 16(24).   0:45.03  15600788   -0.25  Ba8-e4 Kf6-g7 Kb5-a6 Kg7xh7 Ka6-b7
                                      Kh7-g7 Kb7-a8 Kg7-f6 c3-c2 Kf6-e5 Be4-d3
                                      Ke5-d4 Bd3-f5 Kd4-d5 Bf5-d3 Kd5-e6 Bd3-c4
 17(26)&   1:09.88  21162864   -0.25  Ba8-e4 Kf6-g7 Kb5-a6 Kg7xh7 Ka6-b7
                                      Kh7-g7 Kb7-a8 Kg7-f6 c3-c2 Kf6-e5 Be4-d3
                                      Ke5-d4 Bd3-f5 Kd4-d5 Bf5-d3 Kd5-e6 Bd3-c4
                                      Ke6-d6 Bc4-d3 (Kd6-d5) (Bd3-e2) (Kd5-d4)
(Be2-g4)
                                      (Kd4-e5) (Bg4-e2) (Ke5-e6) (Be2-c4)
 17(26).   1:25.31  25470482   -0.25  Ba8-e4 Kf6-g7 Kb5-a6 Kg7xh7 Ka6-b7
                                      Kh7-g7 Kb7-a8 Kg7-f6 c3-c2 Kf6-e5 Be4-d3
                                      Ke5-d4 Bd3-f5 Kd4-d5 Bf5-d3 Kd5-e6 Bd3-c4
                                      Ke6-d6 Bc4-d3 (Kd6-d5) (Bd3-e2) (Kd5-d4)
(Be2-g4)
                                      (Kd4-e5) (Bg4-e2) (Ke5-e6) (Be2-c4)
 18(27)&   2:03.69  34531330   -0.25  Ba8-e4 Kf6-g7 Kb5-a6 Kg7xh7 Ka6-b7
                                      Kh7-g7 Kb7-a8 Kg7-f6 c3-c2 Kf6-e5 Be4-d3
                                      Ke5-d4 Bd3-f5 Kd4-d5 Bf5-d3 Kd5-e6 Bd3-e2
                                      Ke6-d7 Be2-c4
 18(27).   2:17.69  38235144   -0.25  Ba8-e4 Kf6-g7 Kb5-a6 Kg7xh7 Ka6-b7
                                      Kh7-g7 Kb7-a8 Kg7-f6 c3-c2 Kf6-e5 Be4-d3
                                      Ke5-d4 Bd3-f5 Kd4-d5 Bf5-d3 Kd5-e6 Bd3-e2
                                      Ke6-d7 Be2-c4



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