Score chain pawn also by rank

[stockfish] / src / pawns.cpp

diff --git a/src/pawns.cpp b/src/pawns.cpp
index 37db2cf513e0babdc11b7235da701dfa3311c840..1934628e010eb06b11f2c75d5a4ce1ebab946f52 100644 (file)
--- a/src/pawns.cpp
+++ b/src/pawns.cpp
@@ -176,7 +176,7 @@ namespace {
             value -= Backward[opposed][f];
 
         if (chain)
-            value += ChainMember[f];
+            value += ChainMember[f] + CandidatePassed[relative_rank(Us, s)] / 2;
 
         if (candidate)
         {