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Enable futility pruning for PV nodes in qsearch

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STC:

LLR: 4.20 (-2.94,2.94) [-3.00,1.00]
Total: 85573 W: 17195 L: 17125 D: 51253

LTC:

LLR: 2.94 (-2.94,2.94) [-3.00,1.00]
Total: 43385 W: 7298 L: 7214 D: 28873

Bench: 8080602

Resolves #206
This commit is contained in:
lucasart
2015-01-14 20:18:41 +00:00
committed by Joona Kiiski
parent 4abe333e1f
commit ab276357d7
1 changed files with 4 additions and 6 deletions
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10
src/search.cpp
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@@ -1209,8 +1209,7 @@ moves_loop: // When in check and at SpNode search starts from here
: pos.gives_check(move, ci); : pos.gives_check(move, ci);
// Futility pruning // Futility pruning
if ( !PvNode if ( !InCheck
&& !InCheck
&& !givesCheck && !givesCheck
&& futilityBase > -VALUE_KNOWN_WIN && futilityBase > -VALUE_KNOWN_WIN
&& !pos.advanced_pawn_push(move)) && !pos.advanced_pawn_push(move))
@@ -1219,13 +1218,13 @@ moves_loop: // When in check and at SpNode search starts from here
futilityValue = futilityBase + PieceValue[EG][pos.piece_on(to_sq(move))]; futilityValue = futilityBase + PieceValue[EG][pos.piece_on(to_sq(move))];
if (futilityValue < beta) if (futilityValue <= alpha)
{ {
bestValue = std::max(bestValue, futilityValue); bestValue = std::max(bestValue, futilityValue);
continue; continue;
} }
if (futilityBase < beta && pos.see(move) <= VALUE_ZERO) if (futilityBase <= alpha && pos.see(move) <= VALUE_ZERO)
{ {
bestValue = std::max(bestValue, futilityBase); bestValue = std::max(bestValue, futilityBase);
continue; continue;
@@ -1239,8 +1238,7 @@ moves_loop: // When in check and at SpNode search starts from here
&& !pos.can_castle(pos.side_to_move()); && !pos.can_castle(pos.side_to_move());
// Don't search moves with negative SEE values // Don't search moves with negative SEE values
if ( !PvNode if ( (!InCheck || evasionPrunable)
&& (!InCheck || evasionPrunable)
&& type_of(move) != PROMOTION && type_of(move) != PROMOTION
&& pos.see_sign(move) < VALUE_ZERO) && pos.see_sign(move) < VALUE_ZERO)
continue; continue;