X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fendgame.cpp;h=7b9c145e4284d5f4ca73d08e60670568a7a3177b;hp=1a5959e5fea8e4120844d5ac8c868c16c4626a5f;hb=a5e3b4eddede900c1df610e8e25026a79d706500;hpb=8b229381daa9c2537dc9a8cf5080a3a282265d0a

diff --git a/src/endgame.cpp b/src/endgame.cpp
index 1a5959e5..7b9c145e 100644
--- a/src/endgame.cpp
+++ b/src/endgame.cpp
@@ -79,7 +79,6 @@ namespace Endgames {
     add<KQKR>("KQKR");
     add<KNNKP>("KNNKP");
 
-    add<KNPK>("KNPK");
     add<KRPKR>("KRPKR");
     add<KRPKB>("KRPKB");
     add<KBPKB>("KBPKB");
@@ -392,8 +391,8 @@ ScaleFactor Endgame<KQKRPs>::operator()(const Position& pos) const {
       &&  relative_rank(weakSide, pos.square<KING>(strongSide)) >= RANK_4
       &&  relative_rank(weakSide, rsq) == RANK_3
       && (  pos.pieces(weakSide, PAWN)
-          & pos.attacks_from<KING>(kingSq)
-          & pos.attacks_from<PAWN>(rsq, strongSide)))
+          & attacks_bb<KING>(kingSq)
+          & pawn_attacks_bb(strongSide, rsq)))
           return SCALE_FACTOR_DRAW;
 
   return SCALE_FACTOR_NONE;
@@ -536,7 +535,7 @@ ScaleFactor Endgame<KRPKB>::operator()(const Position& pos) const {
       // the corner
       if (   rk == RANK_6
           && distance(psq + 2 * push, ksq) <= 1
-          && (PseudoAttacks[BISHOP][bsq] & (psq + push))
+          && (attacks_bb<BISHOP>(bsq) & (psq + push))
           && distance<File>(bsq, psq) >= 2)
           return ScaleFactor(8);
   }
@@ -671,14 +670,14 @@ ScaleFactor Endgame<KBPPKB>::operator()(const Position& pos) const {
     if (   ksq == blockSq1
         && opposite_colors(ksq, wbsq)
         && (   bbsq == blockSq2
-            || (pos.attacks_from<BISHOP>(blockSq2) & pos.pieces(weakSide, BISHOP))
+            || (attacks_bb<BISHOP>(blockSq2, pos.pieces()) & pos.pieces(weakSide, BISHOP))
             || distance<Rank>(psq1, psq2) >= 2))
         return SCALE_FACTOR_DRAW;
 
     else if (   ksq == blockSq2
              && opposite_colors(ksq, wbsq)
              && (   bbsq == blockSq1
-                 || (pos.attacks_from<BISHOP>(blockSq1) & pos.pieces(weakSide, BISHOP))))
+                 || (attacks_bb<BISHOP>(blockSq1, pos.pieces()) & pos.pieces(weakSide, BISHOP))))
         return SCALE_FACTOR_DRAW;
     else
         return SCALE_FACTOR_NONE;
@@ -713,25 +712,6 @@ ScaleFactor Endgame<KBPKN>::operator()(const Position& pos) const {
 }
 
 
-/// KNP vs K. There is a single rule: 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 Endgame<KNPK>::operator()(const Position& pos) const {
-
-  assert(verify_material(pos, strongSide, KnightValueMg, 1));
-  assert(verify_material(pos, weakSide, VALUE_ZERO, 0));
-
-  // Assume strongSide is white and the pawn is on files A-D
-  Square pawnSq     = normalize(pos, strongSide, pos.square<PAWN>(strongSide));
-  Square weakKingSq = normalize(pos, strongSide, pos.square<KING>(weakSide));
-
-  if (pawnSq == SQ_A7 && distance(SQ_A8, weakKingSq) <= 1)
-      return SCALE_FACTOR_DRAW;
-
-  return SCALE_FACTOR_NONE;
-}
-
-
 /// KP vs KP. This is done by removing the weakest side's pawn and probing the
 /// KP vs K bitbase: If the weakest side has a draw without the pawn, it probably
 /// has at least a draw with the pawn as well. The exception is when the stronger