assert(pos.non_pawn_material(weakerSide) == VALUE_ZERO);
assert(!pos.count<PAWN>(weakerSide));
+ assert(!pos.checkers()); // Eval is never called when in check
// Stalemate detection with lone king
- if ( pos.side_to_move() == weakerSide
- && !pos.checkers()
- && !MoveList<LEGAL>(pos).size()) {
- return VALUE_DRAW;
- }
+ if (pos.side_to_move() == weakerSide && !MoveList<LEGAL>(pos).size())
+ return VALUE_DRAW;
Square winnerKSq = pos.king_square(strongerSide);
Square loserKSq = pos.king_square(weakerSide);
if ( pos.count<QUEEN>(strongerSide)
|| pos.count<ROOK>(strongerSide)
- || pos.bishop_pair(strongerSide)) {
- result += VALUE_KNOWN_WIN;
- }
+ || pos.bishop_pair(strongerSide))
+ result += VALUE_KNOWN_WIN;
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 Endgame<KmmKm>::operator()(const Position&) const {
- return VALUE_DRAW;
-}
+/// Some cases of trivial draws
+template<> Value Endgame<KNNK>::operator()(const Position&) const { return VALUE_DRAW; }
+template<> Value Endgame<KmmKm>::operator()(const Position&) const { return VALUE_DRAW; }
-template<>
-Value Endgame<KNNK>::operator()(const Position&) const {
- return VALUE_DRAW;
-}
/// K, bishop and one or more pawns vs K. It checks for draws with rook pawns and
/// a bishop of the wrong color. If such a draw is detected, SCALE_FACTOR_DRAW