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Subject: Re: WAC018 position and WCrafty-17-12.exe

Author: Carlos del Cacho

Date: 12:53:40 01/09/01

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On January 09, 2001 at 13:59:59, Larry Griffiths wrote:

>[D]R7/P4k2/8/8/8/8/r7/6K1 w - -
>
>Hopefully this position will show up visually.
>
>I have been testing my minmax again and using Crafty's perft command to verify
>the possible moves at each ply.  I entered this WAC018 position using setboard
>in crafty.  Crafty and I match until ply 5.
>
>Crafty gets...
>
>White(1): perft 1
>total moves=9  time=0.00
>White(1): perft 2
>total moves=147  time=0.00
>White(1): perft 3
>total moves=2335  time=0.0

You most 0
>White(1): perft 4
>total moves=39892  time=0.03
>White(1): perft 5
>total moves=731140  time=0.58
>White(1):
>
>My program gets...
>
>Ply ---CAPTURES-- -----MOVES----- -----TOTAL-----
>  1             0               9               9
>  2            11             136             147
>  3            31           2,304           2,335
>  4         1,934          37,958          39,892
>  5        12,323         718,979         731,302
>
>Bob, have you discovered any move generation bugs in crafty since 17.12?
>I will be looking at my move generation code for bugs, but I wonder if anyone
>else can confirm if 731,140 or 731,302 is correct.
>
>Thanks in advance,
>Larry.

You most probably have a bug. My program matches Bob's numbers.

Carlos



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