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Simplify aspiration window

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Don't modify alpha window on fail-high

Bench: 5875983

Closes #1172
This commit is contained in:
VoyagerOne 2017-07-23 17:25:23 -07:00 • committed by Joona Kiiski
parent 272e4d1ac7
commit a6ae2d3a31
1 changed files with 2 additions and 5 deletions
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7
src/search.cpp
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@ -437,10 +437,7 @@ void Thread::search() {
} }
} }
else if (bestValue >= beta) else if (bestValue >= beta)
{
alpha = (alpha + beta) / 2;
beta = std::min(bestValue + delta, VALUE_INFINITE); beta = std::min(bestValue + delta, VALUE_INFINITE);
}
else else
break; break;
@ -1061,8 +1058,8 @@ moves_loop: // When in check search starts from here
++static_cast<MainThread*>(thisThread)->bestMoveChanges; ++static_cast<MainThread*>(thisThread)->bestMoveChanges;
} }
else else
// All other moves but the PV are set to the lowest value: this is // All other moves but the PV are set to the lowest value: this
// not a problem when sorting because the sort is stable and the // is not a problem when sorting because the sort is stable and the
// move position in the list is preserved - just the PV is pushed up. // move position in the list is preserved - just the PV is pushed up.
rm.score = -VALUE_INFINITE; rm.score = -VALUE_INFINITE;
} }