X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fevaluate.cpp;h=8eb0364844a363e5fb33e5a7e55a4d8e26dd739c;hp=1d52d30cd9ccdb8f746d11eb10d89ebc26ed3dc4;hb=a66e6e5ad903218a612fdaaf027999b9d48a0294;hpb=7bce8831d361317e0cf5156a888ca2d3e568a2ff

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 1d52d30c..8eb03648 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -583,7 +583,7 @@ namespace {
 
     const Color Them = (Us == WHITE ? BLACK : WHITE);
 
-    Bitboard b, squaresToQueen, defendedSquares, unsafeSquares, supportingPawns;
+    Bitboard b, squaresToQueen, defendedSquares, unsafeSquares;
     Score score = SCORE_ZERO;
 
     b = ei.pi->passed_pawns(Us);
@@ -633,33 +633,22 @@ namespace {
                 else
                     defendedSquares = squaresToQueen & ei.attackedBy[Us][ALL_PIECES];
 
-                // If there aren't any enemy attacks, then assign a huge bonus.
-                // The bonus will be a bit smaller if at least the block square
-                // isn't attacked, otherwise assign the smallest possible bonus.
-                int k = !unsafeSquares ? 15 : !(unsafeSquares & blockSq) ? 9 : 3;
+                // If there aren't any enemy attacks, assign a big bonus. Otherwise
+                // assign a smaller bonus if the block square isn't attacked.
+                int k = !unsafeSquares ? 15 : !(unsafeSquares & blockSq) ? 9 : 0;
 
-                // Assign a big bonus if the path to the queen is fully defended,
-                // otherwise assign a bit less of a bonus if at least the block
-                // square is defended.
+                // If the path to queen is fully defended, assign a big bonus.
+                // Otherwise assign a smaller bonus if the block square is defended.
                 if (defendedSquares == squaresToQueen)
                     k += 6;
 
                 else if (defendedSquares & blockSq)
-                    k += (unsafeSquares & defendedSquares) == unsafeSquares ? 4 : 2;
+                    k += 4;
 
                 mbonus += Value(k * rr), ebonus += Value(k * rr);
             }
         } // rr != 0
 
-        // Increase the bonus if the passed pawn is supported by a friendly pawn
-        // on the same rank and a bit smaller if it's on the previous rank.
-        supportingPawns = pos.pieces(Us, PAWN) & adjacent_files_bb(file_of(s));
-        if (supportingPawns & rank_bb(s))
-            ebonus += Value(r * 20);
-
-        else if (supportingPawns & rank_bb(s - pawn_push(Us)))
-            ebonus += Value(r * 12);
-
         // Rook pawns are a special case: They are sometimes worse, and
         // sometimes better than other passed pawns. It is difficult to find
         // good rules for determining whether they are good or bad. For now,