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Bonus for restricting opponent's piece moves
STC: LLR: 2.96 (-2.94,2.94) [0.00,5.00] Total: 51883 W: 11297 L: 10915 D: 29671 http://tests.stockfishchess.org/tests/view/5bf1e2ee0ebc595e0ae3cacd LTC: LLR: 2.96 (-2.94,2.94) [0.00,5.00] Total: 15859 W: 2752 L: 2565 D: 10542 http://tests.stockfishchess.org/tests/view/5bf337980ebc5902bcecbf62 Notes: (1) The bonus value has not been carefully tested, so it may be possible to find slightly better values. (2) Plan is to now try adding similar restriction for pawns. I wanted to include that as part of this pull request, but I was advised to do it as two separate pull requests. STC is currently running here, but may not add enough value to pass green. Bench: 3679086
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3 changed files with 13 additions and 5 deletions
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@ -162,6 +162,7 @@ namespace {
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constexpr Score MinorBehindPawn = S( 16, 0);
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constexpr Score Overload = S( 12, 6);
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constexpr Score PawnlessFlank = S( 18, 94);
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constexpr Score RestrictedPiece = S( 7, 6);
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constexpr Score RookOnPawn = S( 10, 28);
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constexpr Score SliderOnQueen = S( 49, 21);
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constexpr Score ThreatByKing = S( 21, 84);
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@ -508,7 +509,7 @@ namespace {
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constexpr Direction Up = (Us == WHITE ? NORTH : SOUTH);
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constexpr Bitboard TRank3BB = (Us == WHITE ? Rank3BB : Rank6BB);
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Bitboard b, weak, defended, nonPawnEnemies, stronglyProtected, safe;
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Bitboard b, weak, defended, nonPawnEnemies, stronglyProtected, safe, restricted;
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Score score = SCORE_ZERO;
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// Non-pawn enemies
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@ -558,6 +559,13 @@ namespace {
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score += Overload * popcount(b);
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}
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// Bonus for restricting their piece moves
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restricted = attackedBy[Them][ALL_PIECES]
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& ~attackedBy[Them][PAWN]
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& ~attackedBy2[Them]
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& attackedBy[Us][ALL_PIECES];
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score += RestrictedPiece * popcount(restricted);
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// Bonus for enemy unopposed weak pawns
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if (pos.pieces(Us, ROOK, QUEEN))
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score += WeakUnopposedPawn * pe->weak_unopposed(Them);
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