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Subject: Re: Mate in 7 moves - diagram

Author: Dieter Buerssner

Date: 07:18:53 09/28/00

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On September 28, 2000 at 04:26:54, Bernhard Bauer wrote:

[much snipped]

>My modification has also to do with null move, but I do another change.
>Instead of the original statement in search.c
>if (do_null && !tree->in_check[ply] && pieces
>                                    && (pieces>5 || depth<421)) {
>
>I use the following statement
>if (do_null && !tree->in_check[ply] && pieces>0 && depth>60 &&
>                                    && (pieces>9 || depth>301) ) {

This is interesting. The original Crafty code uses null move at the leaves of
the tree, when close to the endgame. Your code uses null move at at the front of
the tree. Has this shown to be better in test suites or in games?

Also, you don't allow null moves at the last ply. Does this reach higher depth
with the same node count?

-- Dieter







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