/// Scaling functions
-// KBP vs K
-KBPKScalingFunction ScaleKBPK = KBPKScalingFunction(WHITE);
-KBPKScalingFunction ScaleKKBP = KBPKScalingFunction(BLACK);
-
-// KQ vs KRP
-KQKRPScalingFunction ScaleKQKRP = KQKRPScalingFunction(WHITE);
-KQKRPScalingFunction ScaleKRPKQ = KQKRPScalingFunction(BLACK);
-
-// KRP vs KR
-KRPKRScalingFunction ScaleKRPKR = KRPKRScalingFunction(WHITE);
-KRPKRScalingFunction ScaleKRKRP = KRPKRScalingFunction(BLACK);
-
-// KRPP vs KRP
-KRPPKRPScalingFunction ScaleKRPPKRP = KRPPKRPScalingFunction(WHITE);
-KRPPKRPScalingFunction ScaleKRPKRPP = KRPPKRPScalingFunction(BLACK);
-
-// King and pawns vs king
-KPsKScalingFunction ScaleKPsK = KPsKScalingFunction(WHITE);
-KPsKScalingFunction ScaleKKPs = KPsKScalingFunction(BLACK);
-
-// KBP vs KB
-KBPKBScalingFunction ScaleKBPKB = KBPKBScalingFunction(WHITE);
-KBPKBScalingFunction ScaleKBKBP = KBPKBScalingFunction(BLACK);
-
-// KBP vs KN
-KBPKNScalingFunction ScaleKBPKN = KBPKNScalingFunction(WHITE);
-KBPKNScalingFunction ScaleKNKBP = KBPKNScalingFunction(BLACK);
-
-// KNP vs K
-KNPKScalingFunction ScaleKNPK = KNPKScalingFunction(WHITE);
-KNPKScalingFunction ScaleKKNP = KNPKScalingFunction(BLACK);
-
-// KPKP
-KPKPScalingFunction ScaleKPKPw = KPKPScalingFunction(WHITE);
-KPKPScalingFunction ScaleKPKPb = KPKPScalingFunction(BLACK);
+ScalingFunction<KBPK> ScaleKBPK(WHITE), ScaleKKBP(BLACK); // KBP vs K
+ScalingFunction<KQKRP> ScaleKQKRP(WHITE), ScaleKRPKQ(BLACK); // KQ vs KRP
+ScalingFunction<KRPKR> ScaleKRPKR(WHITE), ScaleKRKRP(BLACK); // KRP vs KR
+ScalingFunction<KRPPKRP> ScaleKRPPKRP(WHITE), ScaleKRPKRPP(BLACK); // KRPP vs KRP
+ScalingFunction<KPsK> ScaleKPsK(WHITE), ScaleKKPs(BLACK); // King and pawns vs king
+ScalingFunction<KBPKB> ScaleKBPKB(WHITE), ScaleKBKBP(BLACK); // KBP vs KB
+ScalingFunction<KBPPKB> ScaleKBPPKB(WHITE), ScaleKBKBPP(BLACK); // KBPP vs KB
+ScalingFunction<KBPKN> ScaleKBPKN(WHITE), ScaleKNKBP(BLACK); // KBP vs KN
+ScalingFunction<KNPK> ScaleKNPK(WHITE), ScaleKKNP(BLACK); // KNP vs K
+ScalingFunction<KPKP> ScaleKPKPw(WHITE), ScaleKPKPb(BLACK); // KPKP
////
//// Functions
////
-/// Constructors
-
-EndgameEvaluationFunction::EndgameEvaluationFunction(Color c) : strongerSide(c) {
- weakerSide = opposite_color(strongerSide);
-}
-
-ScalingFunction::ScalingFunction(Color c) : strongerSide(c) {
- weakerSide = opposite_color(c);
-}
-
-KBPKScalingFunction::KBPKScalingFunction(Color c) : ScalingFunction(c) {}
-KQKRPScalingFunction::KQKRPScalingFunction(Color c) : ScalingFunction(c) {}
-KRPKRScalingFunction::KRPKRScalingFunction(Color c) : ScalingFunction(c) {}
-KRPPKRPScalingFunction::KRPPKRPScalingFunction(Color c) : ScalingFunction(c) {}
-KPsKScalingFunction::KPsKScalingFunction(Color c) : ScalingFunction(c) {}
-KBPKBScalingFunction::KBPKBScalingFunction(Color c) : ScalingFunction(c) {}
-KBPKNScalingFunction::KBPKNScalingFunction(Color c) : ScalingFunction(c) {}
-KNPKScalingFunction::KNPKScalingFunction(Color c) : ScalingFunction(c) {}
-KPKPScalingFunction::KPKPScalingFunction(Color c) : ScalingFunction(c) {}
-
-
/// Mate with KX vs K. This function is used to evaluate positions with
/// King and plenty of material vs a lone king. It simply gives the
/// attacking side a bonus for driving the defending king towards the edge
}
template<>
-Value EvaluationFunction<KmmKm>::apply(const Position &pos) {
+Value EvaluationFunction<KmmKm>::apply(const Position&) {
return Value(0);
}
/// bishop of the wrong color. If such a draw is detected, ScaleFactor(0) is
/// returned. If not, the return value is SCALE_FACTOR_NONE, i.e. no scaling
/// will be used.
-
-ScaleFactor KBPKScalingFunction::apply(const Position& pos) {
+template<>
+ScaleFactor ScalingFunction<KBPK>::apply(const Position& pos) {
assert(pos.non_pawn_material(strongerSide) == BishopValueMidgame);
assert(pos.piece_count(strongerSide, BISHOP) == 1);
/// king and queen, while the weaker side has at least a rook and a pawn.
/// It tests for fortress draws with a rook on the third rank defended by
/// a pawn.
-
-ScaleFactor KQKRPScalingFunction::apply(const Position& pos) {
+template<>
+ScaleFactor ScalingFunction<KQKRP>::apply(const Position& pos) {
assert(pos.non_pawn_material(strongerSide) == QueenValueMidgame);
assert(pos.piece_count(strongerSide, QUEEN) == 1);
///
/// It would also be nice to rewrite the actual code for this function,
/// which is mostly copied from Glaurung 1.x, and not very pretty.
-
-ScaleFactor KRPKRScalingFunction::apply(const Position &pos) {
+template<>
+ScaleFactor ScalingFunction<KRPKR>::apply(const Position &pos) {
assert(pos.non_pawn_material(strongerSide) == RookValueMidgame);
assert(pos.piece_count(strongerSide, PAWN) == 1);
/// KRPPKRPScalingFunction scales KRPP vs KRP endgames. There is only a
/// single pattern: If the stronger side has no pawns and the defending king
/// is actively placed, the position is drawish.
-
-ScaleFactor KRPPKRPScalingFunction::apply(const Position &pos) {
+template<>
+ScaleFactor ScalingFunction<KRPPKRP>::apply(const Position &pos) {
assert(pos.non_pawn_material(strongerSide) == RookValueMidgame);
assert(pos.piece_count(strongerSide, PAWN) == 2);
/// KPsKScalingFunction scales endgames with king and two or more pawns
/// against king. There is just a single rule here: If all pawns are on
/// the same rook file and are blocked by the defending king, it's a draw.
-
-ScaleFactor KPsKScalingFunction::apply(const Position &pos) {
+template<>
+ScaleFactor ScalingFunction<KPsK>::apply(const Position &pos) {
assert(pos.non_pawn_material(strongerSide) == Value(0));
assert(pos.piece_count(strongerSide, PAWN) >= 2);
/// square of the king is not of the same color as the stronger side's bishop,
/// it's a draw. If the two bishops have opposite color, it's almost always
/// a draw.
-
-ScaleFactor KBPKBScalingFunction::apply(const Position &pos) {
+template<>
+ScaleFactor ScalingFunction<KBPKB>::apply(const Position &pos) {
assert(pos.non_pawn_material(strongerSide) == BishopValueMidgame);
assert(pos.piece_count(strongerSide, BISHOP) == 1);
}
+/// KBPPKBScalingFunction scales KBPP vs KB endgames. It detects a few basic
+/// draws with opposite-colored bishops.
+template<>
+ScaleFactor ScalingFunction<KBPPKB>::apply(const Position& pos) {
+
+ assert(pos.non_pawn_material(strongerSide) == BishopValueMidgame);
+ assert(pos.piece_count(strongerSide, BISHOP) == 1);
+ assert(pos.piece_count(strongerSide, PAWN) == 2);
+ assert(pos.non_pawn_material(weakerSide) == BishopValueMidgame);
+ assert(pos.piece_count(weakerSide, BISHOP) == 1);
+ assert(pos.piece_count(weakerSide, PAWN) == 0);
+
+ Square wbsq = pos.piece_list(strongerSide, BISHOP, 0);
+ Square bbsq = pos.piece_list(weakerSide, BISHOP, 0);
+
+ if (square_color(wbsq) == square_color(bbsq))
+ // Not opposite-colored bishops, no scaling
+ return SCALE_FACTOR_NONE;
+
+ Square ksq = pos.king_square(weakerSide);
+ Square psq1 = pos.piece_list(strongerSide, PAWN, 0);
+ Square psq2 = pos.piece_list(strongerSide, PAWN, 1);
+ Rank r1 = square_rank(psq1);
+ Rank r2 = square_rank(psq2);
+ Square blockSq1, blockSq2;
+
+ if (relative_rank(strongerSide, psq1) > relative_rank(strongerSide, psq2))
+ {
+ blockSq1 = psq1 + pawn_push(strongerSide);
+ blockSq2 = make_square(square_file(psq2), square_rank(psq1));
+ }
+ else
+ {
+ blockSq1 = psq2 + pawn_push(strongerSide);
+ blockSq2 = make_square(square_file(psq1), square_rank(psq2));
+ }
+
+ switch (file_distance(psq1, psq2))
+ {
+ case 0:
+ // Both pawns are on the same file. Easy draw if defender firmly controls
+ // some square in the frontmost pawn's path.
+ if ( square_file(ksq) == square_file(blockSq1)
+ && relative_rank(strongerSide, ksq) >= relative_rank(strongerSide, blockSq1)
+ && square_color(ksq) != square_color(wbsq))
+ return ScaleFactor(0);
+ else
+ return SCALE_FACTOR_NONE;
+
+ case 1:
+ // Pawns on neighboring files. Draw if defender firmly controls the square
+ // in front of the frontmost pawn's path, and the square diagonally behind
+ // this square on the file of the other pawn.
+ if ( ksq == blockSq1
+ && square_color(ksq) != square_color(wbsq)
+ && ( bbsq == blockSq2
+ || (pos.piece_attacks<BISHOP>(blockSq2) & pos.bishops(weakerSide))
+ || rank_distance(r1, r2) >= 2))
+ return ScaleFactor(0);
+ else if ( ksq == blockSq2
+ && square_color(ksq) != square_color(wbsq)
+ && ( bbsq == blockSq1
+ || (pos.piece_attacks<BISHOP>(blockSq1) & pos.bishops(weakerSide))))
+ return ScaleFactor(0);
+ else
+ return SCALE_FACTOR_NONE;
+
+ default:
+ // The pawns are not on the same file or adjacent files. No scaling.
+ return SCALE_FACTOR_NONE;
+ }
+}
+
+
/// KBPKNScalingFunction scales KBP vs KN endgames. There is a single rule:
/// If the defending king is somewhere along the path of the pawn, and the
/// square of the king is not of the same color as the stronger side's bishop,
/// it's a draw.
-
-ScaleFactor KBPKNScalingFunction::apply(const Position &pos) {
+template<>
+ScaleFactor ScalingFunction<KBPKN>::apply(const Position &pos) {
assert(pos.non_pawn_material(strongerSide) == BishopValueMidgame);
assert(pos.piece_count(strongerSide, BISHOP) == 1);
/// KNPKScalingFunction scales KNP vs K endgames. There is a single rule:
/// If the pawn is a rook pawn on the 7th rank and the defending king prevents
/// the pawn from advancing, the position is drawn.
-
-ScaleFactor KNPKScalingFunction::apply(const Position &pos) {
+template<>
+ScaleFactor ScalingFunction<KNPK>::apply(const Position &pos) {
assert(pos.non_pawn_material(strongerSide) == KnightValueMidgame);
assert(pos.piece_count(strongerSide, KNIGHT) == 1);
/// the pawn as well. The exception is when the stronger side's pawn is far
/// advanced and not on a rook file; in this case it is often possible to win
/// (e.g. 8/4k3/3p4/3P4/6K1/8/8/8 w - - 0 1).
-
-ScaleFactor KPKPScalingFunction::apply(const Position &pos) {
+template<>
+ScaleFactor ScalingFunction<KPKP>::apply(const Position &pos) {
assert(pos.non_pawn_material(strongerSide) == Value(0));
assert(pos.non_pawn_material(weakerSide) == Value(0));
projects / stockfish / blobdiff