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Maximum aspiration delta of 64

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After 9242 games
Mod vs Orig: 1483 - 1373 - 6386  ELO +4 (+- 2.9)

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Joona Kiiski
2011-02-05 20:24:42 +02:00
committed by Marco Costalba
parent 62c707e1d5
commit 3abff79df3
1 changed files with 1 additions and 1 deletions
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src/search.cpp
+1 -1
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@@ -657,7 +657,7 @@ namespace {
int prevDelta1 = bestValues[iteration - 1] - bestValues[iteration - 2]; int prevDelta1 = bestValues[iteration - 1] - bestValues[iteration - 2];
int prevDelta2 = bestValues[iteration - 2] - bestValues[iteration - 3]; int prevDelta2 = bestValues[iteration - 2] - bestValues[iteration - 3];
aspirationDelta = Max(abs(prevDelta1) + abs(prevDelta2) / 2, 16); aspirationDelta = Min(Max(abs(prevDelta1) + abs(prevDelta2) / 2, 16), 64);
aspirationDelta = (aspirationDelta + 7) / 8 * 8; // Round to match grainSize aspirationDelta = (aspirationDelta + 7) / 8 * 8; // Round to match grainSize
alpha = Max(bestValues[iteration - 1] - aspirationDelta, -VALUE_INFINITE); alpha = Max(bestValues[iteration - 1] - aspirationDelta, -VALUE_INFINITE);