Change condition to use relative rank

[stockfish] / src / evaluate.cpp

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index a73910a7b8be82c91d3b0c6e287ebea783954af6..c7fec9131e11ceeef0b1499c92b2ea1c012c0d83 100644 (file)
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -114,16 +114,15 @@ namespace {
        S( 37, 28), S( 42, 31), S(44, 33) },
      { S(-22,-27), S( -8,-13), S( 6,  1), S(20, 15), S(34, 29), S(48, 43), // Bishops
        S( 60, 55), S( 68, 63), S(74, 68), S(77, 72), S(80, 75), S(82, 77),
-       S( 84, 79), S( 86, 81), S(87, 82), S(87, 82) },
+       S( 84, 79), S( 86, 81) },
      { S(-17,-33), S(-11,-16), S(-5,  0), S( 1, 16), S( 7, 32), S(13, 48), // Rooks
        S( 18, 64), S( 22, 80), S(26, 96), S(29,109), S(31,115), S(33,119),
-       S( 35,122), S( 36,123), S(37,124), S(38,124) },
+       S( 35,122), S( 36,123), S(37,124) },
      { S(-12,-20), S( -8,-13), S(-5, -7), S(-2, -1), S( 1,  5), S( 4, 11), // Queens
        S(  7, 17), S( 10, 23), S(13, 29), S(16, 34), S(18, 38), S(20, 40),
        S( 22, 41), S( 23, 41), S(24, 41), S(25, 41), S(25, 41), S(25, 41),
        S( 25, 41), S( 25, 41), S(25, 41), S(25, 41), S(25, 41), S(25, 41),
-       S( 25, 41), S( 25, 41), S(25, 41), S(25, 41), S(25, 41), S(25, 41),
-       S( 25, 41), S( 25, 41) }
+       S( 25, 41), S( 25, 41), S(25, 41), S(25, 41) }
   };
 
   // Outpost[PieceType][Square] contains bonuses of knights and bishops, indexed
@@ -819,14 +818,13 @@ Value do_evaluate(const Position& pos, Value& margin) {
             ebonus -= Value(square_distance(pos.king_square(Us), blockSq) * 2 * rr);
 
             // If blockSq is not the queening square then consider also a second push
-            if (rank_of(blockSq) != (Us == WHITE ? RANK_8 : RANK_1))
+            if (relative_rank(Us, blockSq) != RANK_8)
                 ebonus -= Value(square_distance(pos.king_square(Us), blockSq + pawn_push(Us)) * rr);
 
             // If the pawn is free to advance, increase bonus
             if (pos.is_empty(blockSq))
             {
                 squaresToQueen = forward_bb(Us, s);
-                defendedSquares = squaresToQueen & ei.attackedBy[Us][ALL_PIECES];
 
                 // If there is an enemy rook or queen attacking the pawn from behind,
                 // add all X-ray attacks by the rook or queen. Otherwise consider only
@@ -837,6 +835,12 @@ Value do_evaluate(const Position& pos, Value& margin) {
                 else
                     unsafeSquares = squaresToQueen & (ei.attackedBy[Them][ALL_PIECES] | pos.pieces(Them));
 
+                if (    unlikely(forward_bb(Them, s) & pos.pieces(Us, ROOK, QUEEN))
+                    && (forward_bb(Them, s) & pos.pieces(Us, ROOK, QUEEN) & pos.attacks_from<ROOK>(s)))
+                    defendedSquares = squaresToQueen;
+                else
+                    defendedSquares = squaresToQueen & ei.attackedBy[Us][ALL_PIECES];
+
                 // If there aren't enemy attacks huge bonus, a bit smaller if at
                 // least block square is not attacked, otherwise smallest bonus.
                 int k = !unsafeSquares ? 15 : !(unsafeSquares & blockSq) ? 9 : 3;