Remove supporting pawns

[stockfish] / src / evaluate.cpp

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 859a1c38138ae8c1284e6d92ddfce20770f7c7b0..6ec42e24e9a0c602e50b2838857bc49449106060 100644 (file)
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -379,10 +379,10 @@ namespace {
             }
 
             // Give a bonus for a rook on a open or semi-open file
-            if (ei.pi->semiopen(Us, file_of(s)))
-                score += ei.pi->semiopen(Them, file_of(s)) ? RookOpenFile : RookSemiopenFile;
+            if (ei.pi->semiopen_file(Us, file_of(s)))
+                score += ei.pi->semiopen_file(Them, file_of(s)) ? RookOpenFile : RookSemiopenFile;
 
-            if (mob > 3 || ei.pi->semiopen(Us, file_of(s)))
+            if (mob > 3 || ei.pi->semiopen_file(Us, file_of(s)))
                 continue;
 
             Square ksq = pos.king_square(Us);
@@ -391,8 +391,8 @@ namespace {
             // king has lost its castling capability.
             if (   ((file_of(ksq) < FILE_E) == (file_of(s) < file_of(ksq)))
                 && (rank_of(ksq) == rank_of(s) || relative_rank(Us, ksq) == RANK_1)
-                && !ei.pi->semiopen_on_side(Us, file_of(ksq), file_of(ksq) < FILE_E))
-                score -= (TrappedRook - make_score(mob * 8, 0)) * (pos.can_castle(Us) ? 1 : 2);
+                && !ei.pi->semiopen_side(Us, file_of(ksq), file_of(s) < file_of(ksq)))
+                score -= (TrappedRook - make_score(mob * 8, 0)) * (1 + !pos.can_castle(Us));
         }
 
         // An important Chess960 pattern: A cornered bishop blocked by a friendly
@@ -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);
@@ -651,15 +651,6 @@ namespace {
             }
         } // 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,