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Introduce bonus for queen infiltration

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Idea is that queen feels much better when it can't be kicked away now
or later by pawn moves, especially in endgame. Special thanks to
Linmiao Xu for the original idea of this patch.

passed STC:
LLR: 2.94 (-2.94,2.94) {-0.50,1.50}
Total: 84008 W: 16271 L: 15958 D: 51779
Ptnml(0-2): 1476, 9688, 19420, 9887, 1533
https://tests.stockfishchess.org/tests/view/5eee7ca0447c5b640047a439

passed LTC:
LLR: 2.95 (-2.94,2.94) {0.25,1.75}
Total: 11720 W: 1522 L: 1328 D: 8870
Ptnml(0-2): 52, 1021, 3574, 1107, 106
https://tests.stockfishchess.org/tests/view/5eefc588122d6514328d75f9

closes https://github.com/official-stockfish/Stockfish/pull/2759

Bench: 4471740
This commit is contained in:
FauziAkram 2020-06-22 12:52:31 +03:00 • committed by Stéphane Nicolet
parent 8a3f155b1c
commit e9966d9a8e
1 changed files with 9 additions and 4 deletions
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13
src/evaluate.cpp
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@ -143,16 +143,17 @@ namespace {
constexpr Score ReachableOutpost = S( 31, 22); constexpr Score ReachableOutpost = S( 31, 22);
constexpr Score PassedFile = S( 11, 8); constexpr Score PassedFile = S( 11, 8);
constexpr Score PawnlessFlank = S( 17, 95); constexpr Score PawnlessFlank = S( 17, 95);
constexpr Score QueenInfiltration = S( -2, 14);
constexpr Score RestrictedPiece = S( 7, 7); constexpr Score RestrictedPiece = S( 7, 7);
constexpr Score RookOnKingRing = S( 16, 0); constexpr Score RookOnKingRing = S( 16, 0);
constexpr Score RookOnQueenFile = S( 5, 9); constexpr Score RookOnQueenFile = S( 6, 11);
constexpr Score SliderOnQueen = S( 59, 18); constexpr Score SliderOnQueen = S( 60, 18);
constexpr Score ThreatByKing = S( 24, 89); constexpr Score ThreatByKing = S( 24, 89);
constexpr Score ThreatByPawnPush = S( 48, 39); constexpr Score ThreatByPawnPush = S( 48, 39);
constexpr Score ThreatBySafePawn = S(173, 94); constexpr Score ThreatBySafePawn = S(173, 94);
constexpr Score TrappedRook = S( 55, 13); constexpr Score TrappedRook = S( 55, 13);
constexpr Score WeakQueen = S( 51, 14); constexpr Score WeakQueen = S( 56, 15);
constexpr Score WeakQueenProtection = S( 15, 0); constexpr Score WeakQueenProtection = S( 14, 0);
#undef S #undef S
@ -373,6 +374,10 @@ namespace {
Bitboard queenPinners; Bitboard queenPinners;
if (pos.slider_blockers(pos.pieces(Them, ROOK, BISHOP), s, queenPinners)) if (pos.slider_blockers(pos.pieces(Them, ROOK, BISHOP), s, queenPinners))
score -= WeakQueen; score -= WeakQueen;
// Bonus for queen on weak square in enemy camp
if (relative_rank(Us, s) > RANK_4 && (~pe->pawn_attacks_span(Them) & s))
score += QueenInfiltration;
} }
} }
if (T) if (T)