From 33b0718faa80f3f74787f92a62f1ee42c78ab8ab Mon Sep 17 00:00:00 2001
From: xoto10 <buylow001@gmail.com>
Date: Mon, 15 Jul 2019 21:10:00 +0100
Subject: [PATCH] Extra Backward penalty for backward pawns if on rank 4/5/6.
 Bench 3358030

---
 src/pawns.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/pawns.cpp b/src/pawns.cpp
index 0d3a57bfa6e..9a159a23dca 100644
--- a/src/pawns.cpp
+++ b/src/pawns.cpp
@@ -69,6 +69,8 @@ namespace {
 
     constexpr Color     Them = (Us == WHITE ? BLACK : WHITE);
     constexpr Direction Up   = (Us == WHITE ? NORTH : SOUTH);
+    constexpr Bitboard  Adv  = (Us == WHITE ? Rank4BB | Rank5BB | Rank6BB
+                                            : Rank5BB | Rank4BB | Rank3BB );
 
     Bitboard b, neighbours, stoppers, doubled, support, phalanx;
     Bitboard lever, leverPush;
@@ -138,7 +140,7 @@ namespace {
             score -= Isolated + WeakUnopposed * int(!opposed);
 
         else if (backward)
-            score -= Backward + WeakUnopposed * int(!opposed);
+            score -= Backward + Backward * bool(SquareBB[s] & Adv) + WeakUnopposed * int(!opposed);
 
         if (doubled && !support)
             score -= Doubled;