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Skip quiet moves based on moveCount pruning threshold and history stats

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If we can moveCountPrune and next quiet move has negative stats,
then go directly to the next move stage (Bad_Captures).

Reduction formula is tweaked to compensate for the decrease in move count that is used in LMR.

STC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 6847 W: 1276 L: 1123 D: 4448

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 48687 W: 6503 L: 6226 D: 35958

Bench: 5919519

Closes #1036
This commit is contained in:
VoyagerOne
2017-03-18 15:41:55 -07:00
committed by Joona Kiiski
parent c80d52c845
commit 352bd6f5aa
3 changed files with 12 additions and 7 deletions
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6
src/movepick.cpp
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@@ -175,7 +175,7 @@ void MovePicker::score<EVASIONS>() {
/// left. It picks the move with the biggest value from a list of generated moves
/// taking care not to return the ttMove if it has already been searched.
Move MovePicker::next_move() {
Move MovePicker::next_move(bool skipQuiets) {
Move move;
@@ -248,9 +248,11 @@ Move MovePicker::next_move() {
++stage;
case QUIET:
while (cur < endMoves)
while ( cur < endMoves
&& (!skipQuiets || cur->value >= VALUE_ZERO))
{
move = *cur++;
if ( move != ttMove
&& move != ss->killers[0]
&& move != ss->killers[1]