#include "endgame.h"
#include "pawns.h"
-extern int probe_kpk_bitbase(Square wksq, Square wpsq, Square bksq, Color stm);
+using std::string;
+
+extern uint32_t probe_kpk_bitbase(Square wksq, Square wpsq, Square bksq, Color stm);
namespace {
return Value(KRKNKingKnightDistancePenalty[d]);
}
+ // Build corresponding key for the opposite color: "KBPKN" -> "KNKBP"
+ const string swapColors(const string& keyCode) {
+
+ size_t idx = keyCode.find('K', 1);
+ return keyCode.substr(idx) + keyCode.substr(0, idx);
+ }
+
+ // Build up a fen string with the given pieces, note that the fen string
+ // could be of an illegal position.
+ Key buildKey(const string& keyCode) {
+
+ assert(keyCode.length() > 0 && keyCode.length() < 8);
+ assert(keyCode[0] == 'K');
+
+ string fen;
+ bool upcase = false;
+
+ for (size_t i = 0; i < keyCode.length(); i++)
+ {
+ if (keyCode[i] == 'K')
+ upcase = !upcase;
+
+ fen += char(upcase ? toupper(keyCode[i]) : tolower(keyCode[i]));
+ }
+ fen += char(8 - keyCode.length() + '0');
+ fen += "/8/8/8/8/8/8/8 w - -";
+ return Position(fen, false, 0).get_material_key();
+ }
+
+ typedef EndgameBase<Value> EF;
+ typedef EndgameBase<ScaleFactor> SF;
+
+} // namespace
+
+
+/// Endgames member definitions
+
+template<> const Endgames::EFMap& Endgames::get<EF>() const { return maps.first; }
+template<> const Endgames::SFMap& Endgames::get<SF>() const { return maps.second; }
+
+Endgames::Endgames() {
+
+ add<Endgame<Value, KNNK> >("KNNK");
+ add<Endgame<Value, KPK> >("KPK");
+ add<Endgame<Value, KBNK> >("KBNK");
+ add<Endgame<Value, KRKP> >("KRKP");
+ add<Endgame<Value, KRKB> >("KRKB");
+ add<Endgame<Value, KRKN> >("KRKN");
+ add<Endgame<Value, KQKR> >("KQKR");
+ add<Endgame<Value, KBBKN> >("KBBKN");
+
+ add<Endgame<ScaleFactor, KNPK> >("KNPK");
+ add<Endgame<ScaleFactor, KRPKR> >("KRPKR");
+ add<Endgame<ScaleFactor, KBPKB> >("KBPKB");
+ add<Endgame<ScaleFactor, KBPPKB> >("KBPPKB");
+ add<Endgame<ScaleFactor, KBPKN> >("KBPKN");
+ add<Endgame<ScaleFactor, KRPPKRP> >("KRPPKRP");
+}
+
+Endgames::~Endgames() {
+
+ for (EFMap::const_iterator it = get<EF>().begin(); it != get<EF>().end(); ++it)
+ delete it->second;
+
+ for (SFMap::const_iterator it = get<SF>().begin(); it != get<SF>().end(); ++it)
+ delete it->second;
+}
+
+template<class T>
+void Endgames::add(const string& keyCode) {
+
+ typedef typename T::Base F;
+ typedef std::map<Key, F*> M;
+
+ const_cast<M&>(get<F>()).insert(std::pair<Key, F*>(buildKey(keyCode), new T(WHITE)));
+ const_cast<M&>(get<F>()).insert(std::pair<Key, F*>(buildKey(swapColors(keyCode)), new T(BLACK)));
}
+template<class T>
+T* Endgames::get(Key key) const {
+
+ typename std::map<Key, T*>::const_iterator it = get<T>().find(key);
+ return it != get<T>().end() ? it->second : NULL;
+}
+
+// Explicit template instantiations
+template EF* Endgames::get<EF>(Key key) const;
+template SF* Endgames::get<SF>(Key key) const;
+
/// 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
/// of the board, and for keeping the distance between the two kings small.
template<>
-Value EvaluationFunction<KXK>::apply(const Position& pos) const {
+Value Endgame<Value, KXK>::apply(const Position& pos) const {
assert(pos.non_pawn_material(weakerSide) == VALUE_ZERO);
assert(pos.piece_count(weakerSide, PAWN) == VALUE_ZERO);
/// Mate with KBN vs K. This is similar to KX vs K, but we have to drive the
/// defending king towards a corner square of the right color.
template<>
-Value EvaluationFunction<KBNK>::apply(const Position& pos) const {
+Value Endgame<Value, KBNK>::apply(const Position& pos) const {
assert(pos.non_pawn_material(weakerSide) == VALUE_ZERO);
assert(pos.piece_count(weakerSide, PAWN) == VALUE_ZERO);
/// KP vs K. This endgame is evaluated with the help of a bitbase.
template<>
-Value EvaluationFunction<KPK>::apply(const Position& pos) const {
+Value Endgame<Value, KPK>::apply(const Position& pos) const {
assert(pos.non_pawn_material(strongerSide) == VALUE_ZERO);
assert(pos.non_pawn_material(weakerSide) == VALUE_ZERO);
/// far advanced with support of the king, while the attacking king is far
/// away.
template<>
-Value EvaluationFunction<KRKP>::apply(const Position& pos) const {
+Value Endgame<Value, KRKP>::apply(const Position& pos) const {
assert(pos.non_pawn_material(strongerSide) == RookValueMidgame);
assert(pos.piece_count(strongerSide, PAWN) == 0);
/// KR vs KB. This is very simple, and always returns drawish scores. The
/// score is slightly bigger when the defending king is close to the edge.
template<>
-Value EvaluationFunction<KRKB>::apply(const Position& pos) const {
+Value Endgame<Value, KRKB>::apply(const Position& pos) const {
assert(pos.non_pawn_material(strongerSide) == RookValueMidgame);
assert(pos.piece_count(strongerSide, PAWN) == 0);
/// KR vs KN. The attacking side has slightly better winning chances than
/// in KR vs KB, particularly if the king and the knight are far apart.
template<>
-Value EvaluationFunction<KRKN>::apply(const Position& pos) const {
+Value Endgame<Value, KRKN>::apply(const Position& pos) const {
assert(pos.non_pawn_material(strongerSide) == RookValueMidgame);
assert(pos.piece_count(strongerSide, PAWN) == 0);
/// for the defending side in the search, this is usually sufficient to be
/// able to win KQ vs KR.
template<>
-Value EvaluationFunction<KQKR>::apply(const Position& pos) const {
+Value Endgame<Value, KQKR>::apply(const Position& pos) const {
assert(pos.non_pawn_material(strongerSide) == QueenValueMidgame);
assert(pos.piece_count(strongerSide, PAWN) == 0);
}
template<>
-Value EvaluationFunction<KBBKN>::apply(const Position& pos) const {
+Value Endgame<Value, KBBKN>::apply(const Position& pos) const {
assert(pos.piece_count(strongerSide, BISHOP) == 2);
assert(pos.non_pawn_material(strongerSide) == 2*BishopValueMidgame);
/// K and two minors vs K and one or two minors or K and two knights against
/// king alone are always draw.
template<>
-Value EvaluationFunction<KmmKm>::apply(const Position&) const {
+Value Endgame<Value, KmmKm>::apply(const Position&) const {
return VALUE_DRAW;
}
template<>
-Value EvaluationFunction<KNNK>::apply(const Position&) const {
+Value Endgame<Value, KNNK>::apply(const Position&) const {
return VALUE_DRAW;
}
/// returned. If not, the return value is SCALE_FACTOR_NONE, i.e. no scaling
/// will be used.
template<>
-ScaleFactor ScalingFunction<KBPsK>::apply(const Position& pos) const {
+ScaleFactor Endgame<ScaleFactor, KBPsK>::apply(const Position& pos) const {
assert(pos.non_pawn_material(strongerSide) == BishopValueMidgame);
assert(pos.piece_count(strongerSide, BISHOP) == 1);
/// It tests for fortress draws with a rook on the third rank defended by
/// a pawn.
template<>
-ScaleFactor ScalingFunction<KQKRPs>::apply(const Position& pos) const {
+ScaleFactor Endgame<ScaleFactor, KQKRPs>::apply(const Position& pos) const {
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.
template<>
-ScaleFactor ScalingFunction<KRPKR>::apply(const Position& pos) const {
+ScaleFactor Endgame<ScaleFactor, KRPKR>::apply(const Position& pos) const {
assert(pos.non_pawn_material(strongerSide) == RookValueMidgame);
assert(pos.piece_count(strongerSide, PAWN) == 1);
/// single pattern: If the stronger side has no pawns and the defending king
/// is actively placed, the position is drawish.
template<>
-ScaleFactor ScalingFunction<KRPPKRP>::apply(const Position& pos) const {
+ScaleFactor Endgame<ScaleFactor, KRPPKRP>::apply(const Position& pos) const {
assert(pos.non_pawn_material(strongerSide) == RookValueMidgame);
assert(pos.piece_count(strongerSide, PAWN) == 2);
/// 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.
template<>
-ScaleFactor ScalingFunction<KPsK>::apply(const Position& pos) const {
+ScaleFactor Endgame<ScaleFactor, KPsK>::apply(const Position& pos) const {
assert(pos.non_pawn_material(strongerSide) == VALUE_ZERO);
assert(pos.piece_count(strongerSide, PAWN) >= 2);
/// it's a draw. If the two bishops have opposite color, it's almost always
/// a draw.
template<>
-ScaleFactor ScalingFunction<KBPKB>::apply(const Position& pos) const {
+ScaleFactor Endgame<ScaleFactor, KBPKB>::apply(const Position& pos) const {
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) const {
+ScaleFactor Endgame<ScaleFactor, KBPPKB>::apply(const Position& pos) const {
assert(pos.non_pawn_material(strongerSide) == BishopValueMidgame);
assert(pos.piece_count(strongerSide, BISHOP) == 1);
/// square of the king is not of the same color as the stronger side's bishop,
/// it's a draw.
template<>
-ScaleFactor ScalingFunction<KBPKN>::apply(const Position& pos) const {
+ScaleFactor Endgame<ScaleFactor, KBPKN>::apply(const Position& pos) const {
assert(pos.non_pawn_material(strongerSide) == BishopValueMidgame);
assert(pos.piece_count(strongerSide, BISHOP) == 1);
/// If the pawn is a rook pawn on the 7th rank and the defending king prevents
/// the pawn from advancing, the position is drawn.
template<>
-ScaleFactor ScalingFunction<KNPK>::apply(const Position& pos) const {
+ScaleFactor Endgame<ScaleFactor, KNPK>::apply(const Position& pos) const {
assert(pos.non_pawn_material(strongerSide) == KnightValueMidgame);
assert(pos.piece_count(strongerSide, KNIGHT) == 1);
/// 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).
template<>
-ScaleFactor ScalingFunction<KPKP>::apply(const Position& pos) const {
+ScaleFactor Endgame<ScaleFactor, KPKP>::apply(const Position& pos) const {
assert(pos.non_pawn_material(strongerSide) == VALUE_ZERO);
assert(pos.non_pawn_material(weakerSide) == VALUE_ZERO);
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