Refactor syzygy code in search

[stockfish] / src / evaluate.cpp

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 8cc481726b0760d445dc191ecb5b6f3e7687ac7b..b7a596efba1bfc1f9af5e50971bfae7abd4dcda6 100644 (file)
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -57,9 +57,8 @@ namespace {
 
     // kingAttackersWeight[color] is the sum of the "weight" of the pieces of the
     // given color which attack a square in the kingRing of the enemy king. The
-    // weights of the individual piece types are given by the variables
-    // QueenAttackWeight, RookAttackWeight, BishopAttackWeight and
-    // KnightAttackWeight in evaluate.cpp
+    // weights of the individual piece types are given by the elements in the
+    // KingAttackWeights array.
     int kingAttackersWeight[COLOR_NB];
 
     // kingAdjacentZoneAttacksCount[color] is the number of attacks to squares
@@ -504,10 +503,9 @@ namespace {
     Bitboard b, weak, defended;
     Score score = SCORE_ZERO;
 
-    // Non-pawn enemies defended by a pawn and under our attack
+    // Non-pawn enemies defended by a pawn
     defended =  (pos.pieces(Them) ^ pos.pieces(Them, PAWN))
-              &  ei.attackedBy[Them][PAWN]
-              & (ei.attackedBy[Us][KNIGHT] | ei.attackedBy[Us][BISHOP] | ei.attackedBy[Us][ROOK]);
+              &  ei.attackedBy[Them][PAWN];
 
     // Add a bonus according to the kind of attacking pieces
     if (defended)