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Subject: Re: Nullmove: when to avoid it?

Author: Miguel A. Ballicora

Date: 08:10:30 02/28/01

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On February 28, 2001 at 05:56:36, Leen Ammeraal wrote:

>I am not sure about when to avoid nullmoves.
>I omit it:
>a. when in check
>b. when there are less than 5 pieces (including pawns) on the board
>c. when the last move was a nullmove
>d. at the root node
>Should I also omit it in some other cases,
>for example, when any hashmove (even with a low draft) was found,
>or when beta = alpha + 1?
>Thanks in advance for any help.

Hi Leen,

Regarding b, I do not know whether what I am doing now is correct but I think
that works for me:
When either black or white had no "long range" pieces (bishop, rook or queen)
I disable null move. The rationale is that one side cannot waste
a tempo in a given position having pawns, king and/or knights making the
position prone to have a zugswang.


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