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Use cut-off checks in qsearch as killer moves

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Killers should not be captures, but checks are not
and are produced also in qsearch.

Use this information, will be useful for move ordering.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2008-11-10 11:06:46 +01:00
parent e7bad2687a
commit e86468cc63
1 changed files with 12 additions and 0 deletions
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12
src/search.cpp
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@ -1469,6 +1469,18 @@ namespace {
// Update transposition table
TT.store(pos, value_to_tt(bestValue, ply), depth, MOVE_NONE, VALUE_TYPE_EXACT);
// Update killers only for good check moves
Move m = ss[ply].currentMove;
if (alpha >= beta && ok_to_history(pos, m)) // Only non capture moves are considered
{
// Wrong to update history when depth is <= 0
if (m != ss[ply].killer1)
{
ss[ply].killer2 = ss[ply].killer1;
ss[ply].killer1 = m;
}
}
return bestValue;
}