Author: Zach Wegner
Date: 11:59:07 09/25/04
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On September 25, 2004 at 14:46:06, Peter Fendrich wrote: >On September 25, 2004 at 13:51:39, Zach Wegner wrote: > >>>When you find a mate it first will get x > beta... Right? >>>Then you will never reach the following statement. >>>/Peter >> >>No, this is when the side to move gets mated, giving a score < -MATE + MAXPLY. >> >>Zach > >Right but I meant that return beta will not show -MATE+MAXPLY one ply up. >This nulmove only code, however, and the answer is dependent of what's happening >in the alpha/beta stuff later on... >/Peter Sorry, I misunderstood you. But the mate threat code is typically not (x < -MATE + MAXPLY) but (x == -MATE + ply + 2) so that first when the side to move is mated it returns -MATE + ply (ply being 2 more than where the nullmove is called) and then at ply + 1 it returns MATE - ply (this is a simple change-return val instead of beta at a fail high)
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