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Fix bug in useless checks prune

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With current code we could raise bestValue above beta,
not what is intended for.

Spotted by Richard Vida.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2012-01-29 22:38:08 +01:00
parent a94fd3bbec
commit df31398bb9
1 changed files with 0 additions and 5 deletions
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src/search.cpp
-5
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@@ -1282,12 +1282,7 @@ split_point_start: // At split points actual search starts from here
&& !pos.is_capture_or_promotion(move) && !pos.is_capture_or_promotion(move)
&& ss->eval + PawnValueMidgame / 4 < beta && ss->eval + PawnValueMidgame / 4 < beta
&& !check_is_dangerous(pos, move, futilityBase, beta, &bestValue)) && !check_is_dangerous(pos, move, futilityBase, beta, &bestValue))
{
if (ss->eval + PawnValueMidgame / 4 > bestValue)
bestValue = ss->eval + PawnValueMidgame / 4;
continue; continue;
}
// Check for legality only before to do the move // Check for legality only before to do the move
if (!pos.pl_move_is_legal(move, ci.pinned)) if (!pos.pl_move_is_legal(move, ci.pinned))