Fix a silly unstoppable eval bug

The logic is broken for black side because we get more bonus
for pawn in 7th rank than for pawn in 2nd rank!

Spotted by Reuven Peleg

bench:3884409

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 7844deb..63c0f1f 100644 (file)
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -906,7 +906,7 @@ Value do_evaluate(const Position& pos, Value& margin) {
     if (!b || pos.non_pawn_material(~us))
         return SCORE_ZERO;
 
-    return Unstoppable * int(relative_rank(WHITE, frontmost_sq(us, b)));
+    return Unstoppable * int(relative_rank(us, frontmost_sq(us, b)));
   }