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Reduce countermoves less in LMR

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Passed SPRT for both short TC 15+0.05:
LLR: 2.95 (-2.94,2.94)
Total: 17724 W: 3756 L: 3598 D: 10370

And long TC 60+0.05:
LLR: 2.95 (-2.94,2.94)
Total: 22672 W: 4232 L: 4011 D: 14429

bench: 4418832
This commit is contained in:
Marco Costalba
2013-05-19 21:32:52 +02:00
parent 8ceef92266
commit 77547a4ef1
3 changed files with 13 additions and 11 deletions
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7
src/movepick.cpp
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@@ -70,7 +70,7 @@ namespace {
/// search captures, promotions and some checks) and about how important good
/// move ordering is at the current node.
MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const HistoryStats& h, const CountermovesStats& cm,
MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const HistoryStats& h, Move* cm,
Search::Stack* s, Value beta) : pos(p), history(h), depth(d) {
assert(d > DEPTH_ZERO);
@@ -89,9 +89,8 @@ MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const HistoryStats&
killers[0].move = ss->killers[0];
killers[1].move = ss->killers[1];
Square prevSq = to_sq((ss-1)->currentMove);
killers[2].move = cm[pos.piece_on(prevSq)][prevSq].first;
killers[3].move = cm[pos.piece_on(prevSq)][prevSq].second;
killers[2].move = cm[0];
killers[3].move = cm[1];
// Consider sligtly negative captures as good if at low depth and far from beta
if (ss && ss->staticEval < beta - PawnValueMg && d < 3 * ONE_PLY)