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Disable use of aspiration window in known win positions

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When we are hunting for mate, transposition table is filled in
with mate scores. Current implemenatation of aspiration search
can't cope with this very well.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Joona Kiiski 2009-06-17 13:16:51 +03:00 • committed by Marco Costalba
parent 46c0bdb74f
commit 8acb1d7e4d
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -657,7 +657,7 @@ namespace {
// Calculate dynamic search window based on previous iterations
Value alpha, beta;
if (MultiPV == 1 && Iteration >= 6)
if (MultiPV == 1 && Iteration >= 6 && abs(IterationInfo[Iteration - 1].value) < VALUE_KNOWN_WIN)
{
int prevDelta1 = IterationInfo[Iteration - 1].speculatedValue - IterationInfo[Iteration - 2].speculatedValue;
int prevDelta2 = IterationInfo[Iteration - 2].speculatedValue - IterationInfo[Iteration - 3].speculatedValue;