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CMH Fix: Exclude captures for TT move refutation penalty

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This will make sure we store only quiet moves for TT Penalty.

STC:
LLR: 2.96 (-2.94,2.94) [-1.50,4.50]
Total: 34748 W: 6617 L: 6420 D: 21711

LTC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 19975 W: 3259 L: 3137 D: 13579

Bench: 8063826

Resolves #373
This commit is contained in:
VoyagerOne 2015-06-27 12:19:42 -04:00 • committed by Joona Kiiski
parent 112607bf49
commit aa0dc16b75
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -1428,7 +1428,7 @@ moves_loop: // When in check and at SpNode search starts from here
} }
// Extra penalty for TT move in previous ply when it gets refuted // Extra penalty for TT move in previous ply when it gets refuted
if (is_ok((ss-2)->currentMove) && (ss-1)->currentMove == (ss-1)->ttMove) if (is_ok((ss-2)->currentMove) && (ss-1)->currentMove == (ss-1)->ttMove && !pos.captured_piece_type())
{ {
Square prevPrevSq = to_sq((ss-2)->currentMove); Square prevPrevSq = to_sq((ss-2)->currentMove);
HistoryStats& ttMoveCmh = CounterMovesHistory[pos.piece_on(prevPrevSq)][prevPrevSq]; HistoryStats& ttMoveCmh = CounterMovesHistory[pos.piece_on(prevPrevSq)][prevPrevSq];