X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fevaluate.cpp;h=6b590c7842976cdc4c99a689d5af7011e1f6f3f2;hp=5a8a292f9a24c34596309562f6c86c79a29fb4c0;hb=19dd0de4ff83e682bafa56d27f302d8f00d3040d;hpb=43f67eab5f55508e07e4e3d7cec885dc4e82036f diff --git a/src/evaluate.cpp b/src/evaluate.cpp index 5a8a292f..6b590c78 100644 --- a/src/evaluate.cpp +++ b/src/evaluate.cpp @@ -150,37 +150,23 @@ namespace { #undef S - const Score BishopPinBonus = make_score(66, 11); - - // Bonus for having the side to move (modified by Joona Kiiski) const Score Tempo = make_score(24, 11); - // Rooks and queens on the 7th rank - const Score RookOn7thBonus = make_score(11, 20); - const Score QueenOn7thBonus = make_score( 3, 8); - - // Rooks and queens attacking pawns on the same rank - const Score RookOnPawnBonus = make_score(10, 28); - const Score QueenOnPawnBonus = make_score( 4, 20); - - // Rooks on open files (modified by Joona Kiiski) - const Score RookOpenFileBonus = make_score(43, 21); - const Score RookHalfOpenFileBonus = make_score(19, 10); - - // Penalty for rooks trapped inside a friendly king which has lost the - // right to castle. - const Value TrappedRookPenalty = Value(180); - - // Penalty for bishop with pawns on the same coloured squares - const Score BishopPawnsPenalty = make_score(8, 12); + const Score BishopPinBonus = make_score(66, 11); + const Score RookOn7thBonus = make_score(11, 20); + const Score QueenOn7thBonus = make_score( 3, 8); + const Score RookOnPawnBonus = make_score(10, 28); + const Score QueenOnPawnBonus = make_score( 4, 20); + const Score RookOpenFileBonus = make_score(43, 21); + const Score RookHalfOpenFileBonus = make_score(19, 10); + const Score BishopPawnsPenalty = make_score( 8, 12); + const Score UndefendedMinorPenalty = make_score(25, 10); + const Score TrappedRookPenalty = make_score(90, 0); // Penalty for a bishop on a1/h1 (a8/h8 for black) which is trapped by // a friendly pawn on b2/g2 (b7/g7 for black). This can obviously only // happen in Chess960 games. - const Score TrappedBishopA1H1Penalty = make_score(100, 100); - - // Penalty for an undefended bishop or knight - const Score UndefendedMinorPenalty = make_score(25, 10); + const Score TrappedBishopA1H1Penalty = make_score(50, 50); // The SpaceMask[Color] contains the area of the board which is considered // by the space evaluation. In the middle game, each side is given a bonus @@ -535,9 +521,7 @@ Value do_evaluate(const Position& pos, Value& margin) { Score evaluate_pieces(const Position& pos, EvalInfo& ei, Score& mobility, Bitboard mobilityArea) { Bitboard b; - Square s, ksq; - int mob; - File f; + Square s; Score score = SCORE_ZERO; const Color Them = (Us == WHITE ? BLACK : WHITE); @@ -548,14 +532,9 @@ Value do_evaluate(const Position& pos, Value& margin) { while ((s = *pl++) != SQ_NONE) { // Find attacked squares, including x-ray attacks for bishops and rooks - if (Piece == KNIGHT || Piece == QUEEN) - b = pos.attacks_from(s); - else if (Piece == BISHOP) - b = attacks_bb(s, pos.pieces() ^ pos.pieces(Us, QUEEN)); - else if (Piece == ROOK) - b = attacks_bb(s, pos.pieces() ^ pos.pieces(Us, ROOK, QUEEN)); - else - assert(false); + b = Piece == BISHOP ? attacks_bb(s, pos.pieces() ^ pos.pieces(Us, QUEEN)) + : Piece == ROOK ? attacks_bb< ROOK>(s, pos.pieces() ^ pos.pieces(Us, ROOK, QUEEN)) + : pos.attacks_from(s); ei.attackedBy[Us][Piece] |= b; @@ -568,9 +547,7 @@ Value do_evaluate(const Position& pos, Value& margin) { ei.kingAdjacentZoneAttacksCount[Us] += popcount(bb); } - mob = (Piece != QUEEN ? popcount(b & mobilityArea) - : popcount(b & mobilityArea)); - + int mob = popcount(b & mobilityArea); mobility += MobilityBonus[Piece][mob]; // Decrease score if we are attacked by an enemy pawn. Remaining part @@ -578,8 +555,8 @@ Value do_evaluate(const Position& pos, Value& margin) { if (ei.attackedBy[Them][PAWN] & s) score -= ThreatenedByPawnPenalty[Piece]; - // Otherwise give a bonus if we are a bishop and can pin a piece or - // can give a discovered check through an x-ray attack. + // Otherwise give a bonus if we are a bishop and can pin a piece or can + // give a discovered check through an x-ray attack. else if ( Piece == BISHOP && (PseudoAttacks[Piece][pos.king_square(Them)] & s) && !more_than_one(BetweenBB[s][pos.king_square(Them)] & pos.pieces())) @@ -594,79 +571,54 @@ Value do_evaluate(const Position& pos, Value& margin) { && !(pos.pieces(Them, PAWN) & attack_span_mask(Us, s))) score += evaluate_outposts(pos, ei, s); - if ((Piece == ROOK || Piece == QUEEN) && relative_rank(Us, s) >= RANK_5) + if ( (Piece == ROOK || Piece == QUEEN) + && relative_rank(Us, s) >= RANK_5) { - // Major piece on 7th rank + // Major piece on 7th rank and enemy king trapped on 8th if ( relative_rank(Us, s) == RANK_7 && relative_rank(Us, pos.king_square(Them)) == RANK_8) - score += (Piece == ROOK ? RookOn7thBonus : QueenOn7thBonus); + score += Piece == ROOK ? RookOn7thBonus : QueenOn7thBonus; - // Major piece attacking pawns on the same rank + // Major piece attacking enemy pawns on the same rank Bitboard pawns = pos.pieces(Them, PAWN) & rank_bb(s); if (pawns) - score += (Piece == ROOK ? RookOnPawnBonus - : QueenOnPawnBonus) * popcount(pawns); - } - - // Special extra evaluation for bishops - if (Piece == BISHOP && pos.is_chess960()) - { - // An important Chess960 pattern: A cornered bishop blocked by - // a friendly pawn diagonally in front of it is a very serious - // problem, especially when that pawn is also blocked. - if (s == relative_square(Us, SQ_A1) || s == relative_square(Us, SQ_H1)) - { - Square d = pawn_push(Us) + (file_of(s) == FILE_A ? DELTA_E : DELTA_W); - if (pos.piece_on(s + d) == make_piece(Us, PAWN)) - { - if (!pos.is_empty(s + d + pawn_push(Us))) - score -= 2*TrappedBishopA1H1Penalty; - else if (pos.piece_on(s + 2*d) == make_piece(Us, PAWN)) - score -= TrappedBishopA1H1Penalty; - else - score -= TrappedBishopA1H1Penalty / 2; - } - } + score += popcount(pawns) * (Piece == ROOK ? RookOnPawnBonus : QueenOnPawnBonus); } // Special extra evaluation for rooks if (Piece == ROOK) { - // Open and half-open files - f = file_of(s); - if (ei.pi->file_is_half_open(Us, f)) - { - if (ei.pi->file_is_half_open(Them, f)) - score += RookOpenFileBonus; - else - score += RookHalfOpenFileBonus; - } + // Give a bonus for a rook on a open or half-open file + if (ei.pi->half_open(Us, file_of(s))) + score += ei.pi->half_open(Them, file_of(s)) ? RookOpenFileBonus + : RookHalfOpenFileBonus; + if (mob > 6 || ei.pi->half_open(Us, file_of(s))) + continue; + + Square ksq = pos.king_square(Us); // Penalize rooks which are trapped inside a king. Penalize more if // king has lost right to castle. - if (mob > 6 || ei.pi->file_is_half_open(Us, f)) - continue; - - ksq = pos.king_square(Us); + if ( ((file_of(ksq) < FILE_E) == (file_of(s) < file_of(ksq))) + && rank_of(ksq) == rank_of(s) + && relative_rank(Us, ksq) == RANK_1 + && !ei.pi->half_open_on_side(Us, file_of(ksq), file_of(ksq) < FILE_E)) + score -= (TrappedRookPenalty - make_score(mob * 8, 0)) * (pos.can_castle(Us) ? 1 : 2); + } - if ( file_of(ksq) >= FILE_E - && file_of(s) > file_of(ksq) - && (relative_rank(Us, ksq) == RANK_1 || rank_of(ksq) == rank_of(s))) - { - // Is there a half-open file between the king and the edge of the board? - if (!ei.pi->has_open_file_to_right(Us, file_of(ksq))) - score -= make_score(pos.can_castle(Us) ? (TrappedRookPenalty - mob * 16) / 2 - : (TrappedRookPenalty - mob * 16), 0); - } - else if ( file_of(ksq) <= FILE_D - && file_of(s) < file_of(ksq) - && (relative_rank(Us, ksq) == RANK_1 || rank_of(ksq) == rank_of(s))) - { - // Is there a half-open file between the king and the edge of the board? - if (!ei.pi->has_open_file_to_left(Us, file_of(ksq))) - score -= make_score(pos.can_castle(Us) ? (TrappedRookPenalty - mob * 16) / 2 - : (TrappedRookPenalty - mob * 16), 0); - } + // An important Chess960 pattern: A cornered bishop blocked by a friendly + // pawn diagonally in front of it is a very serious problem, especially + // when that pawn is also blocked. + if ( Piece == BISHOP + && pos.is_chess960() + && (s == relative_square(Us, SQ_A1) || s == relative_square(Us, SQ_H1))) + { + const enum Piece P = make_piece(Us, PAWN); + Square d = pawn_push(Us) + (file_of(s) == FILE_A ? DELTA_E : DELTA_W); + if (pos.piece_on(s + d) == P) + score -= !pos.is_empty(s + d + pawn_push(Us)) ? TrappedBishopA1H1Penalty * 4 + : pos.piece_on(s + d + d) == P ? TrappedBishopA1H1Penalty * 2 + : TrappedBishopA1H1Penalty; } } @@ -689,8 +641,7 @@ Value do_evaluate(const Position& pos, Value& margin) { Score score = SCORE_ZERO; // Undefended minors get penalized even if not under attack - undefendedMinors = pos.pieces(Them) - & (pos.pieces(BISHOP) | pos.pieces(KNIGHT)) + undefendedMinors = pos.pieces(Them, BISHOP, KNIGHT) & ~ei.attackedBy[Them][ALL_PIECES]; if (undefendedMinors) @@ -912,16 +863,19 @@ Value do_evaluate(const Position& pos, Value& margin) { else unsafeSquares = squaresToQueen & (ei.attackedBy[Them][ALL_PIECES] | pos.pieces(Them)); - // If there aren't enemy attacks or pieces along the path to queen give - // huge bonus. Even bigger if we protect the pawn's path. - if (!unsafeSquares) - ebonus += Value(rr * (squaresToQueen == defendedSquares ? 17 : 15)); - else - // OK, there are enemy attacks or pieces (but not pawns). Are those - // squares which are attacked by the enemy also attacked by us ? - // If yes, big bonus (but smaller than when there are no enemy attacks), - // if no, somewhat smaller bonus. - ebonus += Value(rr * ((unsafeSquares & defendedSquares) == unsafeSquares ? 13 : 8)); + // If there aren't enemy attacks huge bonus, a bit smaller if at + // least block square is not attacked, otherwise smallest bonus. + int k = !unsafeSquares ? 15 : !(unsafeSquares & blockSq) ? 9 : 3; + + // Big bonus if the path to queen is fully defended, a bit less + // if at least block square is defended. + if (defendedSquares == squaresToQueen) + k += 6; + + else if (defendedSquares & blockSq) + k += (unsafeSquares & defendedSquares) == unsafeSquares ? 4 : 2; + + mbonus += Value(k * rr), ebonus += Value(k * rr); } } // rr != 0