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Subject: Re: How much ply should FINE #60 be solved?

Author: Robert Hyatt

Date: 15:22:14 07/03/03

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On July 02, 2003 at 16:46:57, Uri Blass wrote:

>On July 02, 2003 at 12:47:00, Russell Reagan wrote:
>
>>On July 02, 2003 at 08:33:36, Michel Langeveld wrote:
>>
>>>Does a (bugfree) program need 26 ply, 18 ply, or different to see that this
>>>position is > 2. (normal plies, no pawn, singulair extensions).
>>>
>>>I think a normal ply searcher needs more as 18 ply to see in all variations that
>>>the f5 or b6 goes off the board.
>>>
>>>How much ply does your program need?
>>>
>>>[D]8/k7/3p4/p2P1p2/P2P1P2/8/8/K7 w - -
>>
>>I believe you need 26 ply without a hash table, and 18 ply with a correctly
>>working hash table. This position is usually used to test whether or not your
>>hash table is working correctly.
>
>I believe that you cannot say how much plies a program needs without knowing the
>extension and pruning rules that it is using.
>
>Uri

I don't think he meant 26 plies of search depth.  He meant 26 plies of
moves.  There aren't going to be any extensions in this position until a
pawn gets captured, which means a depth of 26 plies is needed without some
serendipitous help from hashing.



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