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Subject: Re: Interesting king security position

Author: Bernhard Bauer

Date: 07:18:07 05/19/98


>
>Here's the position in EPD format:
>
>r1bq1rk1/8/6p1/1PN2n2/p2pB2p/3Nb3/P5PP/1R1Q1R1K w - -
>
>Solution times so far (ranking according to times to play a different
>move than Bxa8, details below, all times on a P233MMX, 128MB RAM):
>

No  Program     / Hardware     /   Ne5 /       b6 /       g4
 -------------------------------------------------------------
 1. DarkThought / 21164a600MHz /     - /        - /    01:45
 2. Crafty 15.8 / 2xPPro233    /     - /        - /     3:11  (6M/2.5M)
 3. MCP 7.1     / P233MMX      /     - /    12:27 /    03:29
 4. Crafty 15.8 / 2xPPro233    /  4:01 /     8:42 /    14:46  (24M/10M)
 5. Fritz 5     / P233MMX      /     - /    05:39 /    24:54
 6. Hiarcs 6    / P233MMX      /     - /    10:57 /    15:44
 7. Shredder 2  / P233MMX      / 21:47 / 01:09:48 / 01:53:44
 8. Rebel 9     / P233MMX      / 35:54 /    51:44 / not tested
 9. CSTal Paris / P233MMX      /     - / 01:20:46 / 02:08:42


Crafty 15.8 ran on a dual PPro200 overclocked to 233 MHz 64Mb memory,
hash=24M, hashp=10M
 3. Crafty 15.8 / 2xPPro233    /  4:01 /     8:42 /    14:46
    everything found on ply 11

hash=6M, hashp=2.5M
    Crafty 15.8 / 2xPPro233    /     - /        - /     3:11
 10->   3:31   3.84   1. g4 Ra5 2. gxf5 gxf5 3. Nb7 Bxb7
                      4. Bxb7 a3 5. Qf3 f4 6. b6


The above list is updated (DarkThought and Crafty added)
The curious thing is that Crafty with (6M/2.5M) hashsize does
better than Crafty with (24M/10M) hashsize.
This looks somewhat odd. T saw this behavior several times when
analyzing for a longer time (10 min).
In principal a bigger hashsize should result in a shorter
solution time or in a better evaluation. But I see again and again
the contrary.

By the way Crafty 15.8 with 2 threads does *not* solve fine70.
Crafty 15.8 with 1 thread gives the solution Kb1.

Kind regards
Bernhard



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