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 7844deb6ae27290333531b91ae220986096f4009..63c0f1f80906076b84fdddf48a1f4df51801525b 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;
 
     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)));

   }
 
 
   }