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Subject: Fruit 2.2.1 tablebase mystery - may be a bug?

Author: Jouni Uski

Date: 02:12:07 11/05/05

I have seen Fruit sometimes stopping  to TB hits. Look here:

[D]k7/4p3/4p3/8/8/3P1P2/5P2/K7 w - - 0 1

Analysis by Fruit 2.2.1:

1.Kb2
  ±  (1.08)   Depth: 1/1   00:00:00
1.Kb2 Kb7
  ±  (0.80)   Depth: 2/2   00:00:00
1.Kb2 Kb7 2.Kc3
  ±  (0.84)   Depth: 3/3   00:00:00
1.Kb2 Kb7 2.Kc3 Kc6
  ±  (0.80)   Depth: 4/4   00:00:00
1.Kb2 Kb7 2.Kc3 Kc6 3.Kd4
  ±  (0.84)   Depth: 5/6   00:00:00
1.Kb2 Kb7 2.Kc3 Kc6 3.Kd4 Kd6
  ±  (0.92)   Depth: 6/7   00:00:00
1.Kb2 Kb7 2.Kc3 Kc6 3.Kd4 Kd6 4.Ke4
  ±  (0.72)   Depth: 7/8   00:00:00  1kN
1.Kb2 Kb7 2.Kc3 e5 3.Kb3 Kc6 4.Kc4 Kd6
  ±  (0.80)   Depth: 8/10   00:00:00  3kN
1.Kb2 Kb7 2.Kc3 Kc6 3.Kd4 Kd6 4.f4 Kc6 5.Ke4
  ±  (0.84)   Depth: 9/12   00:00:00  6kN
1.Kb2 Kb7 2.Kc3 Kc6 3.Kd4 Kd6 4.f4 Kc6 5.Ke5 Kd7
  ±  (1.04)   Depth: 10/13   00:00:00  13kN, tb=2
1.Kb2 Kb7 2.Kc3 Kc6 3.Kd4 Kd6 4.f4 Kc6 5.Ke5 Kd7 6.Kd4
  ±  (0.84)   Depth: 11/14   00:00:01  18kN, tb=4
1.Kb2 Kb7 2.Kc3 e5 3.d4 Kc6 4.dxe5 Kd5 5.f4 Ke4 6.Kc4 Kxf4
  ±  (1.10)   Depth: 12/16   00:00:01  29kN, tb=4
1.Kb2 Kb7 2.Kc3 e5 3.d4 Kc6 4.dxe5 Kd5 5.f4 Ke4 6.Kc4 e6 7.Kc5 Kxf4
  ±  (1.10)   Depth: 13/17   00:00:01  43kN, tb=4
1.Kb2 Kb7 2.Kc3 e5 3.d4 Kc6 4.dxe5 Kd5 5.f4 Ke4 6.Kc4 e6 7.Kc5 Kxf4
  ±  (1.10)   Depth: 14/18   00:00:01  65kN, tb=5
1.Kb2 Kb7 2.Kc3 e5 3.d4 Kc6 4.dxe5 Kd5 5.f4 Ke4 6.Kc4 Kf5 7.Kc5 Ke4 8.f3+ Kxf4
  ±  (1.10)   Depth: 15/20   00:00:01  99kN, tb=6
1.Kb2 Kb7 2.Kc3 Kc6 3.Kd4 Kd6 4.f4 Kc6 5.Ke5 Kd7 6.d4 Kc7 7.Kxe6 Kd8 8.f5 Ke8
  +-  (1.66)   Depth: 16/21   00:00:01  169kN, tb=9
1.Kb2 Kb7 2.Kc3 Kc6 3.Kd4 Kd6 4.f4 Kc6 5.Ke5 Kd7 6.d4 Kc7 7.Kxe6 Kd8 8.f5 Ke8
9.Ke5
  +-  (1.58)   Depth: 17/23   00:00:01  264kN, tb=12
1.Kb2 Kb7 2.Kc3 e5 3.d4 Kc6 4.dxe5 Kd5 5.f4 Ke4 6.Kc4 Kf5 7.Kd4 e6 8.Ke3 Kg6
9.Ke4 Kf7
  +-  (2.06)   Depth: 18/24   00:00:01  410kN, tb=21
1.Kb2 Kb7 2.Kc3 e5 3.d4 Kc6 4.dxe5 Kd5 5.f4 Ke4 6.Kc4 Kf5 7.Kd4 e6 8.Ke3 Kg6
9.Ke4 Kf7 10.f5
  +-  (1.96)   Depth: 19/25   00:00:01  592kN, tb=54
1.Kb2 Kb7 2.Kc3 e5 3.d4 Kc6 4.dxe5 Kd5 5.f4 Ke4 6.Kc4 Kf5 7.Kd4 Ke6 8.Ke4 Kd7
9.f5 Ke8 10.f6 exf6 11.exf6
  +-  (2.53)   Depth: 20/26   00:00:01  840kN, tb=120
1.Kb2 Kb7 2.Kc3 e5 3.d4 Kc6 4.dxe5 Kd5 5.f4 Ke4 6.Kc4 Kf5 7.Kd4 Kg6 8.Ke4 Kg7
9.f5 Kf7 10.f4 Kg7 11.Kd4
  +-  (2.48)   Depth: 21/28   00:00:02  1193kN, tb=270
1.Kb2 Kb7 2.Kc3 e5 3.d4 Kc6 4.dxe5 Kd5 5.f4 Ke4 6.Kc4 Kf5 7.Kd4 Kg6 8.Ke4 Kg7
9.f5 Kf7 10.Kd5 Ke8 11.f6 exf6 12.exf6
  +-  (2.56)   Depth: 22/28   00:00:02  1429kN, tb=423
1.Kb2 Kb7 2.Kc3 e5 3.d4 Kc6 4.dxe5 Kd5 5.f4 Ke4 6.Kc4 Kf5 7.Kd4 Ke6 8.Ke4 Kd7
9.f5 Ke8 10.f6 e6 11.f4 Kf7 12.f5
  +-  (2.89)   Depth: 23/30   00:00:02  1883kN, tb=1210
1.Kb2 Kb7 2.Kc3 e5 3.d4 Kc6 4.dxe5 Kd5 5.f4 Ke4 6.Kc4 Kf5 7.Kc5 Ke4 8.Kc6 Kf5
9.Kd7 e6 10.Kd6 Kg6 11.Kxe6 Kh6 12.f5 Kg5
  +-  (4.09)   Depth: 24/35   00:00:03  3003kN, tb=2143
1.Kb2 Kb7 2.Kc3 e5 3.d4 Kc6 4.dxe5 Kd5 5.f4 Ke4 6.Kc4 Kf5 7.Kc5 Ke4 8.Kc6 Kf5
9.Kd7 e6 10.Kd6 Kg6 11.Kxe6 Kh5 12.Ke7 Kg4 13.e6 Kxf4
  +-  (7.98)   Depth: 25/36   00:00:04  4380kN, tb=3415
1.Kb2 Kb7 2.Kc3 e5 3.d4 Kc6 4.dxe5 Kd5 5.f4 Ke4 6.Kc4 Kf5 7.Kc5 Ke4 8.Kc6 Kf5
9.Kd7 e6 10.Kd6 Kg6 11.Kxe6 Kh5 12.Kf6 Kg4 13.e6 Kxf4
  +-  (7.95)   Depth: 26/36   00:00:05  5624kN, tb=4814
1.Kb2 Kb7 2.Kc3 e5 3.d4 Kc6 4.dxe5 Kd5 5.f4 Ke4 6.Kc4 Kf5 7.Kc5 Ke4 8.Kc6 Kf5
9.Kd7 e6 10.Kd6 Kg6 11.Kxe6 Kh5 12.Kd7 Kg4 13.e6 Kf3 14.e7 Kxf4
  +-  (12.03)   Depth: 27/42   00:00:11  13396kN, tb=6395
1.Kb2 Kb7 2.Kc3 e5 3.d4 Kc6 4.dxe5 Kd5 5.f4 Ke4 6.Kc4 Kf5 7.Kc5 Ke4 8.Kc6 Kf5
9.Kd7 Kg6 10.Kxe7 Kf5 11.e6 Kg4 12.Kd6 Kf5 13.e7 Kf6 14.e8Q Kg7 15.Qe5+ Kf7
16.Qe6+ Kg7
  +-  (12.01)   Depth: 28/42   00:00:13  14481kN, tb=8543

Second try (with or without clearing hash)

Analysis by Fruit 2.2.1:

1.Kb2
  ±  (1.08)   Depth: 1/1   00:00:00
1.Kb2 Kb7
  ±  (0.80)   Depth: 2/2   00:00:00
1.Kb2 Kb7 2.Kc3
  ±  (0.84)   Depth: 3/3   00:00:00
1.Kb2 Kb7 2.Kc3 Kc6
  ±  (0.80)   Depth: 4/4   00:00:00
1.Kb2 Kb7 2.Kc3 e5 3.Kc4
  ±  (0.96)   Depth: 5/7   00:00:00
1.Kb2 Kb7 2.Kc3 e5 3.d4 Kc6 4.dxe5
  +-  (1.50)   Depth: 6/7   00:00:00
1.Kb2 Kb7 2.Kc3 e5 3.d4 Kc6 4.dxe5
  +-  (1.50)   Depth: 7/8   00:00:00  1kN
1.Kb2 Kb7 2.Kc3 e5 3.d4 Kc6 4.dxe5 Kd5
  +-  (1.46)   Depth: 8/10   00:00:00  4kN
1.Kb2 Kb7 2.Kc3 e5 3.d4 Kc6 4.dxe5 Kd5 5.f4
  ±  (1.36)   Depth: 9/10   00:00:00  13kN
1.Kb2 Kb7 2.Kc3 e5 3.d4 Kc6 4.dxe5 Kd5 5.f4 e6
  +-  (1.46)   Depth: 10/13   00:00:00  37kN
1.Kb2 Kb7 2.Kc3 e5 3.d4 Kc6 4.dxe5 Kd5 5.f4 Ke4 6.Kc4 Kxf4
  ±  (1.10)   Depth: 11/15   00:00:00  102kN
1.Kb2 Kb7 2.Kc3 e5 3.d4 Kc6 4.dxe5 Kd5 5.f4 Ke4 6.Kc4 Kxf4
  ±  (1.10)   Depth: 12/15   00:00:01  274kN
1.Kb2 Kb7 2.Kc3 e5 3.d4 Kc6 4.dxe5 Kd5 5.f4 Ke4 6.Kc4 Kf5 7.Kd4 Kxf4
  ±  (1.22)   Depth: 13/18   00:00:01  651kN
1.Kb2 Kb7 2.Kc3 e5 3.d4 Kc6 4.dxe5 Kd5 5.f4 Ke4 6.Kc4 Kf5 7.Kd4 Kxf4
  ±  (1.22)   Depth: 14/18   00:00:01  1495kN
1.Kb2 Kb7 2.Kc3 e5 3.d4 Kc6 4.dxe5 Kd5 5.f4 Ke4 6.Kc4 Kf5 7.Kd4 Ke6 8.Ke4
  +-  (1.72)   Depth: 15/18   00:00:03  3528kN
1.Kb2 Kb7 2.Kc3 e5 3.d4 Kc6 4.dxe5 Kd5 5.f4 Ke4 6.Kc4 Kf5 7.Kd4 Ke6 8.Ke4 Kd7
  +-  (2.04)   Depth: 16/20   00:00:08  9159kN

Note also search depth is much slower! OK I am using 2.2.1 test version, but
may be this happens also with key.

Jouni

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Last modified: Thu, 15 Apr 21 08:11:13 -0700

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