X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fevaluate.cpp;h=cf478909649ed0419c172ed9b7bfadebeca4d246;hp=3ff1460b562742a12c3f79883839d3b7db69e914;hb=37ffacf2094594314346bf9c3d7d8a61911b34d5;hpb=8bf21a723e77399382f05c75e45201882772684a

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 3ff1460b..cf478909 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -605,6 +605,7 @@ namespace {
     };
 
     Bitboard b, bb, squaresToQueen, defendedSquares, unsafeSquares;
+    Bitboard wideUnsafeSquares;
     Score score = SCORE_ZERO;
 
     b = pe->passed_pawns(Us);
@@ -639,6 +640,7 @@ namespace {
                 // consider all the squaresToQueen. Otherwise consider only the squares
                 // in the pawn's path attacked or occupied by the enemy.
                 defendedSquares = unsafeSquares = squaresToQueen = forward_file_bb(Us, s);
+                wideUnsafeSquares = AllSquares;
 
                 bb = forward_file_bb(Them, s) & pos.pieces(ROOK, QUEEN);
 
@@ -647,10 +649,14 @@ namespace {
 
                 if (!(pos.pieces(Them) & bb))
                     unsafeSquares &= attackedBy[Them][ALL_PIECES] | pos.pieces(Them);
+                      
+                if (!unsafeSquares)
+                    wideUnsafeSquares = (attackedBy[Them][ALL_PIECES] | pos.pieces(Them)) 
+                                       & (shift<WEST>(squaresToQueen) | shift<EAST>(squaresToQueen));
 
                 // 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 ? 20 : !(unsafeSquares & blockSq) ? 9 : 0;
+                int k = !wideUnsafeSquares ? 35 : !unsafeSquares ? 20 : !(unsafeSquares & blockSq) ? 9 : 0;
 
                 // Assign a larger bonus if the block square is defended.
                 if (defendedSquares & blockSq)