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Depth dependant aspiration window delta

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Split delta value in aspiration window so that when
search depth is less than 24 a smaller delta value
is used. The idea is that the search is likely to
be more accurate at lower depths and so we can exclude
more possibilities, 25% to be exact.

Passed STC
LLR: 2.96 (-2.94, 2.94) [-1.50, 4.50]
Total: 20430 W: 3775 L: 3618 D: 13037

And LTC
LLR: 2.96 (-2.94, 2.94) [0.00, 6.00]
Total: 5032 W: 839 L: 715 D: 3478

Bench: 7451319
This commit is contained in:
Mysseno 2014-03-14 21:00:50 +11:00 • committed by Marco Costalba
parent d0587f2c7f
commit 36c381154b
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -327,7 +327,7 @@ namespace {
// Reset aspiration window starting size // Reset aspiration window starting size
if (depth >= 5) if (depth >= 5)
{ {
delta = Value(16); delta = Value(depth > 23 ? 16 : 12);
alpha = std::max(RootMoves[PVIdx].prevScore - delta,-VALUE_INFINITE); alpha = std::max(RootMoves[PVIdx].prevScore - delta,-VALUE_INFINITE);
beta = std::min(RootMoves[PVIdx].prevScore + delta, VALUE_INFINITE); beta = std::min(RootMoves[PVIdx].prevScore + delta, VALUE_INFINITE);
} }