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Subject: Re: To NON-believers in EGTB benefits... (some engines benefit greatly...)

Author: Andreas Guettinger

Date: 01:34:26 11/21/05

On November 20, 2005 at 22:42:02, enrico carrisco wrote:

>All find mate -- some do it instantly, but none take over 20 seconds...
>
>Now let's use Fruit 2.2.1 in the same conditions (no egtb):
>
>8/2k5/8/3R4/8/8/5K2/8 w - - 0 1
>
>Analysis by Fruit 2.2.1:
>
>1.Ke3
>  +-  (5.45)   Depth: 1/1   00:00:00
>1.Ke3 Kc6
>  +-  (5.57)   Depth: 2/2   00:00:00
>1.Ke3 Kc6 2.Ke4
>  +-  (5.45)   Depth: 3/4   00:00:00
>1.Kg3 Kb7 2.Kf4
>  +-  (5.55)   Depth: 3/6   00:00:00
>1.Kg3 Kb7 2.Kf4 Kc6
>  +-  (5.58)   Depth: 4/6   00:00:00
>1.Ke3 Kc6 2.Ke4 Kc7
>  +-  (5.76)   Depth: 4/6   00:00:00
>1.Ke3 Kc6 2.Ke4 Kc7 3.Rc5+ Kd6
>  +-  (5.57)   Depth: 5/8   00:00:00
>1.Ke3 Kc6 2.Kd4 Kb6 3.Rc5 Kb7
>  +-  (5.85)   Depth: 6/10   00:00:00  13kN
>1.Ke3 Kc6 2.Kd4 Kb6 3.Rd6+ Kb5 4.Rg6 Kb4 5.Rb6+ Ka4
>  +-  (5.89)   Depth: 7/11   00:00:00  58kN
>1.Ke3 Kc6 2.Kd4 Kb6 3.Rd6+ Kb5 4.Rg6 Kb4 5.Rb6+ Ka5
>  +-  (5.89)   Depth: 8/13   00:00:01  238kN
>1.Ke3 Kc6 2.Kd4 Kb6 3.Rd7 Kb5 4.Rd6 Kb4 5.Rb6+ Ka5
>  +-  (5.89)   Depth: 9/14   00:00:01  972kN
>1.Ke3 Kc6 2.Kd4 Kb6 3.Ke5 Kc7 4.Rc5+ Kd7 5.Rc1 Ke7 6.Rc7+ Kd8
>  +-  (6.25)   Depth: 10/18   00:00:01  3671kN
>1.Ke3 Kc6 2.Kd4 Kb6 3.Ke5 Kc7 4.Rb5 Kd7 5.Rc5 Ke7 6.Rc7+ Kd8
>  +-  (6.25)   Depth: 11/19   00:00:05  13571kN
>1.Rh5 Kd6 2.Ke3 Ke6 3.Kd4 Kd6 4.Rh6+ Ke7 5.Rc6 Ke8 6.Rc7 Kd8
>  +-  (6.26)   Depth: 11/20   00:00:18  48869kN
>1.Rh5 Kd6 2.Ke2 Kd7 3.Kd3 Kc6 4.Rh6+ Kc7 5.Rg6 Kb8 6.Rg7 Kc8 7.Kd4
>  +-  (6.14)   Depth: 12/20   00:00:28  77398kN
>1.Ke3 Kc6 2.Ke4 Kc7 3.Ke5 Kc6 4.Ke6 Kc7 5.Rd6 Kc8 6.Rd7 Kb8
>  +-  (6.33)   Depth: 12/20   00:00:30  83851kN
>1.Ke3 Kc6 2.Kd4 Kb6 3.Rc5 Kb7 4.Ke5 Ka7 5.Rc6 Kb8 6.Rc4 Ka8 7.Rc7
>  +-  (6.45)   Depth: 13/22   00:01:43  279150kN
>
>
>Analysis stopped after 10 minutes -- all analysis on an A64 @ 2.7GHz with 512MB
>hash (except CT 14 due to hash size control limitations.)
>
>Please -- will the die-hard "EGTB files are a waste" believers please stand-up.
>
>Regards,
>
>Enrico.

Deph 13 in 1:43 min in an endgame is indeed a bit hard to believe.
Smells like bug.

A similar behaviour has been reported previously. I think it seems to occur
whether EGTB are on or off, if they are on the EGTB are suddenly not accessed
anymore in a subsequent analysis with very slow search.


regards
Andy

Re: To NON-believers in EGTB benefits... (some engines benefit greatly...) enrico carrisco 01:36:19 11/21/05
- Re: To NON-believers in EGTB benefits... (some engines benefit greatly...) Andreas Guettinger 06:04:22 11/21/05
  - Re: To NON-believers in EGTB benefits... (some engines benefit greatly.. Robert Hyatt 05:36:00 11/22/05

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