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Fix aspiration corner case

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Fix a corner case where we start aspiration window and
suddendly we get a VALUE_KNOWN_WIN / MATE score, this makes
aspiration to blow up in a series of researches loops.

Exit aspiration loop in that case.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2011-02-28 20:17:57 +01:00
parent af236373cb
commit 1f73a9ed63
1 changed files with 3 additions and 3 deletions
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6
src/search.cpp
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@ -643,8 +643,7 @@ namespace {
// Start with a small aspiration window and, in case of fail high/low, // Start with a small aspiration window and, in case of fail high/low,
// research with bigger window until not failing high/low anymore. // research with bigger window until not failing high/low anymore.
while (true) do {
{
// Search starting from ss+1 to allow calling update_gains() // Search starting from ss+1 to allow calling update_gains()
value = search<PV, false, true>(pos, ss+1, alpha, beta, depth * ONE_PLY, 0); value = search<PV, false, true>(pos, ss+1, alpha, beta, depth * ONE_PLY, 0);
@ -680,7 +679,8 @@ namespace {
} }
else else
break; break;
}
} while (abs(value) < VALUE_KNOWN_WIN);
// Collect info about search result // Collect info about search result
bestMove = Rml[0].pv[0]; bestMove = Rml[0].pv[0];