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Do not return unproven mate scores from null move search

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Causes very small functional change which is not observable with
our usual set of test positions.

However change is observable fx. with following position:
4k3/3r4/5Q2/6K1/8/8/8/8 w - - 0 1
go depth 24

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Joona Kiiski 2010-03-21 23:41:50 +02:00 • committed by Marco Costalba
parent 426f55b78d
commit 42de93ac15
1 changed files with 4 additions and 0 deletions
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4
src/search.cpp
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@ -1378,6 +1378,10 @@ namespace {
if (nullValue >= beta) if (nullValue >= beta)
{ {
// Do not return unproven mate scores
if (nullValue >= value_mate_in(PLY_MAX))
nullValue = beta;
if (depth < 6 * OnePly) if (depth < 6 * OnePly)
return nullValue; return nullValue;