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Subject: Re: Q: Fail High percentage

Author: Robert Hyatt

Date: 13:16:01 12/08/00

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On December 08, 2000 at 13:21:21, Peter Fendrich wrote:

>On December 08, 2000 at 13:06:43, Robert Hyatt wrote:
>
>>On December 08, 2000 at 12:56:09, Peter Fendrich wrote:
>>
>>>I looking for a measurement for move generation performance.
>>>
>>>Do you think FH/CountNodes, where FH is number of times the first generated move
>>>was a Fail High, is a good measurement?
>>>Do you have some other?
>>>What's your figures?
>>>I get some 50% and I have a feeling it's to low.
>>>
>>>//Peter
>>
>>
>>The critical statistic I measure in crafty is this:  "For any position where
>>I 'fail high' (return a score >= beta) what percentage of the time does it
>>happen on the _first_ move?"  I generally average 92%.  Anything over 90% is
>>reasonable.  Anything less means move ordering needs work.
>
>OK, it seems logical. I have in princple 3 types of FH:
>  1) Hash table (without moving)
>  2) Null Move
>  3) Ordinary moves (including the hash table move)
>
>Do you include all these cases?
>With only the third case counted I'm well over 90%
>
>//Peter


Only 1 and 3.  2 is done at a different place in the search and doesn't
really count in "move ordering".

Actually, the way you wrote it, only 3 counts.  for 1) you are not searching
a move, so that can't be counted.  2) doesn't count either...



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