X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fendgame.cpp;h=74e16fa6941b0e5e6196c4b319cbd122d6fa5940;hb=2e1369d0302a87d570e509af7041a1be22b836a0;hp=6745ee2664c612689646c283f78833355d509dcf;hpb=be5a2f015e45886e32867b4559ef51dd694a3cec;p=stockfish

diff --git a/src/endgame.cpp b/src/endgame.cpp
index 6745ee26..74e16fa6 100644
--- a/src/endgame.cpp
+++ b/src/endgame.cpp
@@ -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;
 }