Author: Daniel Shawul
Date: 00:35:28 05/07/04
Hello
Are there any options for a null mover to reduce depth.
I read about fail high reductions but it seems to me they are redundant
if( score - our highest hanging > beta)
reduce depth. [cut when it is null move];
what i read in Ed shroeder's paper is confusing me a lot.
He does reductions,evaluation,even null-move after making a move. I don't know
how the later is posssible?
This is how i understand his reductions applied before makemove
Reduction 1.
if( lazy_score - MARGIN > beta)
reduce with 1.
Reduction 2a.
if( real_score - our maximum hanging > beta
real_score - our maximum hanging - small margin < beta)
reduce with 1.
If i am understaning correctly , these reductions will not happen if they happen
after null move. And if the null move fails and then the static reductions occur
most probably it is a wrong one. So i am thinking these are not important for a
null mover?
Are the only options for a null mover to extend only? I mean when the score
returned from null move is less than beta. I do extend when the score is a mate
score but nothing else.
any help appreciated
daniel
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