return (strongerSide == pos.side_to_move() ? result : -result);
}
+
+/// 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&) {
return Value(0);
}
+template<>
+Value EvaluationFunction<KNNK>::apply(const Position&) {
+ return Value(0);
+}
/// KBPKScalingFunction scales endgames where the stronger side has king,
/// bishop and one or more pawns. It checks for draws with rook pawns and a
ScalingFunction<KQKRP> ScaleKQKRP(WHITE), ScaleKRPKQ(BLACK);
ScalingFunction<KPsK> ScaleKPsK(WHITE), ScaleKKPs(BLACK);
ScalingFunction<KPKP> ScaleKPKPw(WHITE), ScaleKPKPb(BLACK);
-
- Key KNNKMaterialKey, KKNNMaterialKey;
}
mi->clear();
mi->key = key;
- // A special case before looking for a specialized evaluation function
- // KNN vs K is a draw.
- if (key == KNNKMaterialKey || key == KKNNMaterialKey)
- {
- mi->factor[WHITE] = mi->factor[BLACK] = 0;
- return mi;
- }
-
// Let's look if we have a specialized evaluation function for this
// particular material configuration. First we look for a fixed
// configuration one, then a generic one if previous search failed.
EndgameFunctions::EndgameFunctions() {
- KNNKMaterialKey = buildKey("KNNK");
- KKNNMaterialKey = buildKey("KKNN");
-
+ add<EvaluationFunction<KNNK> >("KNNK");
add<EvaluationFunction<KPK> >("KPK");
add<EvaluationFunction<KBNK> >("KBNK");
add<EvaluationFunction<KRKP> >("KRKP");