Only opponent camp, S(4x(x-1), x)

Bench: 4940559
snicolet · Jul 10, 2018 · f604de1 · f604de1
1 parent 04c44bf
commit f604de1
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/src/evaluate.cpp b/src/evaluate.cpp
@@ -576,9 +576,9 @@ namespace {
         score += WeakUnopposedPawn * pe->weak_unopposed(Them);
 
     // Entry points in the opponent camp
-    b = attackedBy2[Us] & ~attackedBy2[Them] & ~attackedBy[Them][PAWN];
-    int x = popcount(b & (pos.pieces(Them) | (~pos.pieces() & OpponentCamp)));
-    score += make_score(2 * x * (x - 1), 0);
+    b = OpponentCamp & attackedBy2[Us] & ~attackedBy2[Them] & ~attackedBy[Them][PAWN];
+    int x = popcount(b & ~pos.pieces(Us));
+    score += make_score(4 * x * (x - 1), x);
 
     // Our safe or protected pawns
     b =   pos.pieces(Us, PAWN)