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Simplify threshold handling for probcut. (#936)

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Just use greater equal as this is what see_ge does now.

passed STC
LLR: 2.94 (-2.94,2.94) [-3.00,1.00]
Total: 226506 W: 39755 L: 39978 D: 146773

passed LTC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 138483 W: 17450 L: 17479 D: 103554

Bench: 5212921
This commit is contained in:
Joost VandeVondele 2016-12-22 16:02:32 +01:00 • committed by Marco Costalba
parent f72b7dc99a
commit 1ceaea701b
1 changed files with 3 additions and 3 deletions
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6
src/movepick.cpp
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@ -111,11 +111,11 @@ MovePicker::MovePicker(const Position& p, Move ttm, Value th)
stage = PROBCUT;
// In ProbCut we generate captures with SEE higher than the given threshold
// In ProbCut we generate captures with SEE higher than or equal to the given threshold
ttMove = ttm
&& pos.pseudo_legal(ttm)
&& pos.capture(ttm)
&& pos.see_ge(ttm, threshold + 1)? ttm : MOVE_NONE;
&& pos.see_ge(ttm, threshold)? ttm : MOVE_NONE;
stage += (ttMove == MOVE_NONE);
}
@ -294,7 +294,7 @@ Move MovePicker::next_move() {
{
move = pick_best(cur++, endMoves);
if ( move != ttMove
&& pos.see_ge(move, threshold + 1))
&& pos.see_ge(move, threshold))
return move;
}
break;