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Update killers after a TT hit

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Almost no increase but seems the logic thing to do.

After 16707 games 2771 - 2595 - 11341 ELO +3 (+- 3.2)

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2011-09-18 19:50:42 +01:00
parent 10b24af98a
commit 6bc16f3ff1
1 changed files with 12 additions and 2 deletions
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14
src/search.cpp
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@ -780,8 +780,18 @@ namespace {
: can_return_tt(tte, depth, beta, ss->ply)))
{
TT.refresh(tte);
ss->bestMove = ttMove; // Can be MOVE_NONE
return value_from_tt(tte->value(), ss->ply);
ss->bestMove = move = ttMove; // Can be MOVE_NONE
value = value_from_tt(tte->value(), ss->ply);
if ( value >= beta
&& move
&& !pos.move_is_capture_or_promotion(move)
&& move != ss->killers[0])
{
ss->killers[1] = ss->killers[0];
ss->killers[0] = move;
}
return value;
}
// Step 5. Evaluate the position statically and update parent's gain statistics