Author: David Rasmussen
Date: 06:18:46 03/02/03
Go up one level in this thread
On March 01, 2003 at 06:51:43, Benny Antonsson wrote:
>Hi!
>
>While I was watching Terra play Averno, the following interresting position
>occured:
>
>[D]7r/1PP5/8/8/3k4/3pp3/6P1/3B2K1 b - - 0 73
>
>Averno played e2?? while Terra predicted Rh1+! Which seems to be a draw ?
>
>I have tested a few WB-engines in this position and only Little Goliath thinks
>it's a draw... Crafty, Ruffian, Yace and Fritz does not.
This position makes Chezzz go crazy. Eval is swining wildly and branching factor
is horrible:
time nodes depth score pv
00:00:00.00 33n 01/00/03 +1.290 73... e2 (33)
00:00:00.01 60n 01/01/03 ---------------------------------------------------
00:00:00.01 106n 02/01/05 +1.623 73... e2!
00:00:00.01 169n 02/01/06 +2.085 73... e2 74. Bxe2 dxe2 (169)
00:00:00.03 227n 02/02/06 ---------------------------------------------------
00:00:00.03 548n 03/03/05 +2.085 73... e2 74. Bxe2 dxe2 (548)
00:00:00.04 1002n 03/03/05 ---------------------------------------------------
00:00:00.04 1554n 04/05/08 +1.915 73... e2 74. Bxe2 dxe2 75. Kf2 (1554)
00:00:00.06 2454n 04/05/08 ---------------------------------------------------
00:00:00.06 3788n 05/06/10 +1.690 73... e2 74. Bxe2 dxe2 75. Kf2 Re8 (3788)
00:00:00.07 6302n 05/09/10 ---------------------------------------------------
00:00:00.10 16kn 06/08/11 +1.090 73... e2 74. Bxe2 dxe2 75. Kf2 Re8
76. Ke1 (16505)
00:00:00.14 21kn 06/11/12 ---------------------------------------------------
00:00:00.18 48kn 07/09/13 -4.735 73... e2 74. Bxe2 dxe2 75. Kf2 e1=Q+
76. Kxe1 Rh1+ 77. Ke2 Re1+
78. Kxe1 (48118)
00:00:00.23 77kn 07/14/17 -1.825 73... Rh1+ 74. Kxh1 e2 75. Bxe2 dxe2
76. Kh2 e1=Q 77. b8=Q (77229)
00:00:00.26 86kn 07/14/17 ---------------------------------------------------
00:00:00.28 93kn 08/16/19 -1.775 73... Rh1+ 74. Kxh1 e2 75. Bxe2 dxe2
76. c8=Q e1=Q+ 77. Kh2 Qh4+
78. Qh3 Qf4+ 79. g3 (93721)
00:00:00.28 99kn 08/16/19 -1.492 73... e2!
00:00:11.39 6312kn 08/21/22 +0.505 73... e2 74. Bxe2 dxe2 75. Kf2 e1=Q+
76. Kxe1 Ke3 77. Kd1 Rh1+
78. Kc2 (6312302)
00:00:11.45 6336kn 08/21/22 ---------------------------------------------------
00:00:11.65 6462kn 09/16/17 -4.685 73... e2 74. Bxe2 dxe2 75. Kf2 e1=Q+
76. Kxe1 Ke3 77. Kd1 Rh1+
78. Kc2 Rc1+ 79. Kxc1 (6462822)
00:00:12.09 6740kn 09/19/21 -1.825 73... Rh1+ 74. Kxh1 e2 75. Bxe2 dxe2
76. c8=Q e1=Q+ 77. Kh2 Qh4+
78. Qh3 Qf4+ 79. Qg3 Qh6+
80. Qh3 (6740994)
00:00:12.09 6740kn 09/19/21 ---------------------------------------------------
00:00:12.14 6768kn 10/20/24 -1.795 73... Rh1+ 74. Kxh1 e2 75. Bxe2 dxe2
76. c8=Q e1=Q+ 77. Kh2 Qh4+
78. Qh3 Qf4+ 79. Qg3 Qh6+
80. Kg1 Qc1+ 81. Kf2 (6768500)
00:00:12.15 6783kn 10/20/24 -1.492 73... e2!
00:02:46.50 89Mn 10/27/28 +0.420 73... e2 74. Bxe2 dxe2 75. Kf2 e1=Q+
76. Kxe1 Ke3 77. Kd1 Kd3
78. Ke1 Re8+ 79. Kf2 (89359292)
00:02:46.76 89Mn 10/27/28 ---------------------------------------------------
00:02:47.84 90Mn 11/22/24 -4.665 73... e2 74. Bxe2 dxe2 75. Kf2 e1=Q+
76. Kxe1 Ke3 77. Kd1 Kd3
78. Kc1 Rh1+ 79. Kb2 Rb1+
80. Kxb1 (90076579)
00:02:50.37 91Mn 11/24/25 -1.775 73... Rh1+ 74. Kxh1 e2 75. Bxe2 dxe2
76. c8=Q e1=Q+ 77. Kh2 Qh4+
78. Qh3 Qf4+ 79. g3 Qd2+
80. Qg2 Qh6+ 81. Kg1 Qd6 (91656172)
00:02:50.37 91Mn 11/24/25 ---------------------------------------------------
00:02:50.79 91Mn 12/25/27 -1.795 73... Rh1+ 74. Kxh1 e2 75. Bxe2 dxe2
76. c8=Q e1=Q+ 77. Kh2 Qh4+
78. Qh3 Qf4+ 79. g3 Qd2+
80. Qg2 Qh6+ 81. Kg1 Qc1+
82. Qf1 Qe3+ 83. Kg2 (91887856)
00:02:54.25 93Mn 12/26/28 ---------------------------------------------------
00:02:56.89 95Mn 13/28/31 -1.990 73... Rh1+ 74. Kxh1 e2 75. Bxe2 dxe2
76. c8=Q e1=Q+ 77. Kh2 Qh4+
78. Qh3 Qf4+ 79. g3 Qd2+
80. Qg2 Qh6+ 81. Kg1 Qc1+
82. Qf1 Qc7 83. Qf4+ Qxf4
84. gxf4 (95237558)
00:03:05.70 100Mn 13/28/31 ---------------------------------------------------
00:03:09.67 102Mn 14/30/34 -2.120 73... Rh1+ 74. Kxh1 e2 75. Bxe2 dxe2
76. c8=Q e1=Q+ 77. Kh2 Qe5+
78. Kh3 Qh5+ 79. Kg3 Qe5+
80. Kg4 Qe4+ 81. Kh3 Qe3+
82. g3 Qh6+ 83. Kg4 Qg6+
84. Kf4 Qe4+ 85. Kg5 Qe3+
86. Kg4 Qe4+ 87. Kh5 (102090312)
00:03:27.87 111Mn 14/31/34 ---------------------------------------------------
00:03:41.95 119Mn 15/33/35 -2.120 73... Rh1+ 74. Kxh1 e2 75. Bxe2 dxe2
76. c8=Q e1=Q+ 77. Kh2 Qe5+
78. Kh3 Qh5+ 79. Kg3 Qe5+
80. Kg4 Qe4+ 81. Kh3 Qe3+
82. g3 Qh6+ 83. Kg2 Qd2+
84. Kf3 Qe3+ 85. Kg4 Qe4+
86. Kh5 Qe5+ 87. Kh4 (119026781)
00:04:39.09 148Mn 15/33/35 ---------------------------------------------------
00:05:09.17 163Mn 16/36/39 -1.995 73... Rh1+ 74. Kxh1 e2 75. Bxe2 dxe2
76. c8=Q e1=Q+ 77. Kh2 Qe5+
78. Kh3 Qe3+ 79. Kg4 Qe2+
80. Kg5 Qe7+ 81. Kg6 Qe4+
82. Kh5 Qh7+ 83. Kg4 Qg6+
84. Kh3 Qh6+ 85. Kg3 Qe3+
86. Kh4 Qh6+ 87. Kg4 (163347090)
00:06:42.12 212Mn 16/36/39 ---------------------------------------------------
00:07:52.29 245Mn 17/38/41 -1.820 73... Rh1+ 74. Kxh1 e2 75. Bxe2 dxe2
76. c8=Q e1=Q+ 77. Kh2 Qe5+
78. Kh3 Qh5+ 79. Kg3 Qe5+
80. Kg4 Qe2+ (245750213)
00:12:55.71 397Mn 17/38/41 ---------------------------------------------------
It will make a good test position. I want Chezzz to behave better in this
position. Resolving that failhigh at depth 10 shouldn't make the node count 10
times as high and take 2 minutes...
/David
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