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Updated KNNKP endgame. #2553

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Updated KNNKP endgame. #2553

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9 changes: 5 additions & 4 deletions src/endgame.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -310,16 +310,17 @@ Value Endgame<KQKR>::operator()(const Position& pos) const {
}


/// KNN vs KP. Simply push the opposing king to the corner
/// KNN vs KP. Very drawish, but there are some mate opportunities if we can
// press the weakSide King to a corner before the pawn advances too much.
template<>
Value Endgame<KNNKP>::operator()(const Position& pos) const {

assert(verify_material(pos, strongSide, 2 * KnightValueMg, 0));
assert(verify_material(pos, weakSide, VALUE_ZERO, 1));

Value result = 2 * KnightValueEg
- PawnValueEg
+ PushToEdges[pos.square<KING>(weakSide)];
Value result = PawnValueEg
+ 2 * PushToEdges[pos.square<KING>(weakSide)]
- 10 * relative_rank(weakSide, pos.square<PAWN>(weakSide));

return strongSide == pos.side_to_move() ? result : -result;
}
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