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Subject: Re: Adaptive null move pruning

Author: J. Wesley Cleveland

Date: 17:01:56 03/02/00

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On March 02, 2000 at 12:09:08, Ernst A. Heinz wrote:

>Hi Sanjiv,
>
>>Does anyone know how that decision could be made? I was thinking of trying it
>>in my program.
>
>As the various answers of other posters have shown, there are many
>tests that the function/macro "try_null" could perform. This is
>exactly why I did not want to be more specific and artificially
>restrictive in my text.

It seems to me that there are two main cases where null move would be expected
to work. First, the move just made was worse than not moving, e.g. undeveloping
a piece, or moving the g pawn 2 squares in front of the castled king. Second,
the move two plies before that was so bad that two moves in a row does not help,
e.g dropping a rook. Both of these conditons would be reasonably easy to test
for.



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