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Fix divide by zero bug in late game

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If the game got late enough that move_importance(currentPly) * slowMover / 100
rounds to 0, then we ended up dividing 0 by 0 when only looking 1 move ahead.

This apparently caused the search to almost immediately abort and Stockfish
would blunder in long games. So convert thisMoveImportance to a double.

No functional change.
This commit is contained in:
Matthew Sullivan 2013-10-25 11:22:43 -05:00 • committed by Marco Costalba
parent 48f38f3092
commit d454cd4216
1 changed files with 3 additions and 3 deletions
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6
src/timeman.cpp
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@ -147,14 +147,14 @@ namespace {
const double TMaxRatio = (T == OptimumTime ? 1 : MaxRatio);
const double TStealRatio = (T == OptimumTime ? 0 : StealRatio);
int thisMoveImportance = move_importance(currentPly) * slowMover / 100;
double thisMoveImportance = double(move_importance(currentPly) * slowMover) / 100;
int otherMovesImportance = 0;
for (int i = 1; i < movesToGo; ++i)
otherMovesImportance += move_importance(currentPly + 2 * i);
double ratio1 = (TMaxRatio * thisMoveImportance) / double(TMaxRatio * thisMoveImportance + otherMovesImportance);
double ratio2 = (thisMoveImportance + TStealRatio * otherMovesImportance) / double(thisMoveImportance + otherMovesImportance);
double ratio1 = (TMaxRatio * thisMoveImportance) / (TMaxRatio * thisMoveImportance + otherMovesImportance);
double ratio2 = (thisMoveImportance + TStealRatio * otherMovesImportance) / (thisMoveImportance + otherMovesImportance);
return int(floor(myTime * std::min(ratio1, ratio2)));
}