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[stockfish] / src / endgame.cpp

diff --git a/src/endgame.cpp b/src/endgame.cpp
index b64b75cbca63e22a0f375611d9e5e4be920ea864..ca17f6ac8fcccb2672dcc932e4dbb46f60b048f5 100644 (file)
--- a/src/endgame.cpp
+++ b/src/endgame.cpp
@@ -135,8 +135,8 @@ Value Endgame<KXK>::operator()(const Position& pos) const {
   if (   pos.count<QUEEN>(strongSide)
       || pos.count<ROOK>(strongSide)
       ||(pos.count<BISHOP>(strongSide) && pos.count<KNIGHT>(strongSide))
-      ||(pos.count<BISHOP>(strongSide) > 1 && opposite_colors(pos.squares<BISHOP>(strongSide)[0],
-                                                              pos.squares<BISHOP>(strongSide)[1])))
+      || (   (pos.pieces(strongSide, BISHOP) & ~DarkSquares)
+          && (pos.pieces(strongSide, BISHOP) &  DarkSquares)))
       result = std::min(result + VALUE_KNOWN_WIN, VALUE_MATE_IN_MAX_PLY - 1);
 
   return strongSide == pos.side_to_move() ? result : -result;
@@ -598,7 +598,7 @@ ScaleFactor Endgame<KPsK>::operator()(const Position& pos) const {
 
   // If all pawns are ahead of the king, on a single rook file and
   // the king is within one file of the pawns, it's a draw.
-  if (   !(pawns & ~in_front_bb(weakSide, rank_of(ksq)))
+  if (   !(pawns & ~forward_ranks_bb(weakSide, ksq))
       && !((pawns & ~FileABB) && (pawns & ~FileHBB))
       &&  distance<File>(ksq, lsb(pawns)) <= 1)
       return SCALE_FACTOR_DRAW;
@@ -645,7 +645,7 @@ ScaleFactor Endgame<KBPKB>::operator()(const Position& pos) const {
       if (relative_rank(strongSide, pawnSq) <= RANK_5)
           return SCALE_FACTOR_DRAW;
 
-      Bitboard path = forward_bb(strongSide, pawnSq);
+      Bitboard path = forward_file_bb(strongSide, pawnSq);
 
       if (path & pos.pieces(weakSide, KING))
           return SCALE_FACTOR_DRAW;
@@ -780,7 +780,7 @@ ScaleFactor Endgame<KNPKB>::operator()(const Position& pos) const {
 
   // King needs to get close to promoting pawn to prevent knight from blocking.
   // Rules for this are very tricky, so just approximate.
-  if (forward_bb(strongSide, pawnSq) & pos.attacks_from<BISHOP>(bishopSq))
+  if (forward_file_bb(strongSide, pawnSq) & pos.attacks_from<BISHOP>(bishopSq))
       return ScaleFactor(distance(weakKingSq, pawnSq));
 
   return SCALE_FACTOR_NONE;