int Evaluation::evaluateMobility(int color, Position& position) { assert(Color::isValid(color)); int knightMobility = 0; for (auto squares = position.pieces[color][PieceType::KNIGHT].squares; squares != 0; squares = Bitboard::remainder(squares)) { int square = Bitboard::next(squares); knightMobility += evaluateMobility(color, position, square, Square::knightDirections); } int bishopMobility = 0; for (auto squares = position.pieces[color][PieceType::BISHOP].squares; squares != 0; squares = Bitboard::remainder(squares)) { int square = Bitboard::next(squares); bishopMobility += evaluateMobility(color, position, square, Square::bishopDirections); } int rookMobility = 0; for (auto squares = position.pieces[color][PieceType::ROOK].squares; squares != 0; squares = Bitboard::remainder(squares)) { int square = Bitboard::next(squares); rookMobility += evaluateMobility(color, position, square, Square::rookDirections); } int queenMobility = 0; for (auto squares = position.pieces[color][PieceType::QUEEN].squares; squares != 0; squares = Bitboard::remainder(squares)) { int square = Bitboard::next(squares); queenMobility += evaluateMobility(color, position, square, Square::queenDirections); } return knightMobility * 4 + bishopMobility * 5 + rookMobility * 2 + queenMobility; }
/** * Evaluates the position. * * @param position the position. * @return the evaluation value in centipawns. */ int Evaluation::evaluate(Position& position) { // Initialize int myColor = position.activeColor; int oppositeColor = Color::opposite(myColor); int value = 0; // Evaluate material int materialScore = (evaluateMaterial(myColor, position) - evaluateMaterial(oppositeColor, position)) * materialWeight / MAX_WEIGHT; value += materialScore; // Evaluate mobility int mobilityScore = (evaluateMobility(myColor, position) - evaluateMobility(oppositeColor, position)) * mobilityWeight / MAX_WEIGHT; value += mobilityScore; // Add Tempo value += TEMPO; assert(std::abs(value) < Value::CHECKMATE_THRESHOLD); return value; }
int Evaluation::evaluate(Position& position, bool heavy, int beta, bool dumpoutput) { // Initialize int myColor = position.activeColor; int oppositeColor = Color::opposite(myColor); int value = 0; // Evaluate material int mymaterial = evaluateMaterial(myColor, position); int materialScore = (mymaterial - evaluateMaterial(oppositeColor, position)) * materialWeight / MAX_WEIGHT; value += materialScore; if (dumpoutput) { std::cout << " materialscore: " << mymaterial * materialWeight / MAX_WEIGHT << " " << materialScore; } if (value >= beta + BETA_THRESHOLD) { return value; } if (heavy) { double materialRatio =(double) mymaterial / maxMaterial; // Evaluate mobility int mymobility = evaluateMobility(myColor, position); int mobilityScore = (mymobility - evaluateMobility(oppositeColor, position)) * mobilityWeight / MAX_WEIGHT; value += mobilityScore; if (dumpoutput) { std::cout << " mobilityscore: " << mymobility * mobilityWeight / MAX_WEIGHT << " " << mobilityScore; } // Evaluate center control int mycentre = evaluateCenter(myColor, position); int centerScore = (mycentre - evaluateCenter(oppositeColor, position)) * materialRatio * centerWeight / MAX_WEIGHT; value += centerScore; if (dumpoutput) { std::cout << " centrescore: " << int (mycentre * materialRatio * centerWeight / MAX_WEIGHT) << " " << centerScore; } // Evaluate Pawn structure int mypawn = evaluatePawn(myColor, position); int pawnScore = (mypawn - evaluatePawn(oppositeColor, position)) * pawnStructureWeight / MAX_WEIGHT; value += pawnScore; if (dumpoutput) { std::cout << " pawnscore: " << int(mypawn * pawnStructureWeight / MAX_WEIGHT) << " " << pawnScore; } // Evaluate King Safety int myking = evaluateKingSafety(myColor, position); int kingSafetyScore = (myking - evaluateKingSafety(oppositeColor, position)) * materialRatio * kingSafetyWeight / MAX_WEIGHT; value += kingSafetyScore; if (dumpoutput) { std::cout << " kingscore: " << int(myking * materialRatio * kingSafetyWeight / MAX_WEIGHT) << " " << kingSafetyScore; } } // Add Tempo value += TEMPO; assert(std::abs(value) < Value::CHECKMATE_THRESHOLD); return value; }