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Subject: Tablebase Bug in Comet (for U.Tuerke)

Author: Drexel,Michael

Date: 11:29:11 06/01/03


I check if the engines have access to Tablebases in the search with a simple
Testposition:

[D] 8/8/7Q/p7/8/KP6/5kp1/8 b - - 0 1

The output of Comet B60 CB-native is very strange.
Comet sees a tiny plus for black in a completely lost position !
Obviously a Bug.

Multivariation Analysis by Comet B60:

1. = (-0.03): 79...Ke2 80.Dh2 Kf2 81.Dxg2+
2. +- (#20): 79...Ke1 80.Dh2 Kf1 81.Dxg2+
3. +- (#20): 79...Kg1 80.Dg5 Kf1 81.Dxg2+
4. +- (#20): 79...Kf3 80.Dc6+ Kg3 81.Dxg2+
5. +- (#20): 79...Kg3 80.Dg6+ Kh3 81.Dxg2+
6. +- (#19): 79...g1D 80.Db6+ Kg2 81.Dxg1+
7. +- (#19): 79...g1T 80.Db6+ Kg2 81.Dxg1+
8. +- (#19): 79...g1L 80.Db6+ Kg2 81.Dxg1+
9. +- (#19): 79...g1S 80.Db6+ Kg2 81.Dxg1+

Analysis by Comet B60:

79...g1D
  =  (-0.01)   Tiefe: 1/2   00:00:00
79...g1D 80.Db6+ Kg2 81.Dxg1+
  +-  (#19)   Tiefe: 2/6   00:00:00
79...Kf3 80.Db6
  +-  (6.96)   Tiefe: 2/6   00:00:00
79...Kf1 80.Db6
  +-  (4.55)   Tiefe: 2/6   00:00:00
79...Kf1 80.Da6+ Kg1
  +-  (6.81)   Tiefe: 2/6   00:00:00
79...Kf1 80.Da6+ Kg1 81.Dxa5
  +-  (#18)   Tiefe: 2/6   00:00:00
79...Kf3 80.Dc6+ Kg3 81.Dxg2+
  +-  (#20)   Tiefe: 2/6   00:00:00
79...Ke2 80.Dh2
  +-  (7.10)   Tiefe: 2/6   00:00:00
79...Ke2 80.Dh2 Kf2 81.Dxg2+
  +-  (#20)   Tiefe: 3/6   00:00:00
79...Ke2
  =  (-0.03)   Tiefe: 3/8   00:00:00

Michael



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