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Center aspiration window on last returned score

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bench: 4428212
This commit is contained in:
Marco Costalba 2013-06-30 11:00:19 +02:00
parent 6f079ae720
commit b50eb6bea8
1 changed files with 8 additions and 8 deletions
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16
src/search.cpp
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@ -335,8 +335,8 @@ namespace {
if (depth >= 5)
{
delta = Value(16);
alpha = RootMoves[PVIdx].prevScore - delta;
beta = RootMoves[PVIdx].prevScore + delta;
alpha = std::max(RootMoves[PVIdx].prevScore - delta,-VALUE_INFINITE);
beta = std::min(RootMoves[PVIdx].prevScore + delta, VALUE_INFINITE);
}
// Start with a small aspiration window and, in case of fail high/low,
@ -364,18 +364,18 @@ namespace {
if (Signals.stop)
return;
// In case of failing high/low increase aspiration window and
// In case of failing low/high increase aspiration window and
// research, otherwise exit the loop.
if (bestValue >= beta)
beta += delta;
else if (bestValue <= alpha)
if (bestValue <= alpha)
{
alpha -= delta;
alpha = std::max(bestValue - delta, -VALUE_INFINITE);
Signals.failedLowAtRoot = true;
Signals.stopOnPonderhit = false;
}
else if (bestValue >= beta)
beta = std::min(bestValue + delta, VALUE_INFINITE);
else
break;