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Replace MVV/LVA by MVV for good captures

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Passed STC

LLR: 3.71 (-2.94,2.94) [-3.00,1.00]
Total: 64363 W: 12299 L: 12214 D: 39850

and LTC

LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 69976 W: 11056 L: 11011 D: 47909

Bench: 8012532

Resolves #340
This commit is contained in:
Stefano80 2015-04-28 22:06:18 +01:00 • committed by Joona Kiiski
parent b7063ef65b
commit cc54a91ca5
1 changed files with 3 additions and 11 deletions
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14
src/movepick.cpp
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@ -134,10 +134,10 @@ MovePicker::MovePicker(const Position& p, Move ttm, const HistoryStats& h, const
/// highest values will be picked first.
template<>
void MovePicker::score<CAPTURES>() {
// Winning and equal captures in the main search are ordered by MVV/LVA.
// Winning and equal captures in the main search are ordered by MVV.
// Suprisingly, this appears to perform slightly better than SEE based
// move ordering. The reason is probably that in a position with a winning
// capture, capturing a more valuable (but sufficiently defended) piece
// capture, capturing a valuable (but sufficiently defended) piece
// first usually doesn't hurt. The opponent will have to recapture, and
// the hanging piece will still be hanging (except in the unusual cases
// where it is possible to recapture with the hanging piece). Exchanging
@ -148,15 +148,7 @@ void MovePicker::score<CAPTURES>() {
// has been picked up in pick_move_from_list(). This way we save some SEE
// calls in case we get a cutoff.
for (auto& m : *this)
if (type_of(m) == ENPASSANT)
m.value = PieceValue[MG][PAWN] - Value(PAWN);
else if (type_of(m) == PROMOTION)
m.value = PieceValue[MG][pos.piece_on(to_sq(m))] - Value(PAWN)
+ PieceValue[MG][promotion_type(m)] - PieceValue[MG][PAWN];
else
m.value = PieceValue[MG][pos.piece_on(to_sq(m))]
- Value(type_of(pos.moved_piece(m)));
m.value = Value(int(pos.piece_on(to_sq(m))));
}
template<>