Tweak opposite colord bishops endgame scaling.

[stockfish] / src / evaluate.cpp

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 4a4ae2ad982b430d941dbcaca85af66a0eb0bf12..c2e7efef44ce9f0bb3fd6d799f11e4c7398c8f54 100644 (file)
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -758,7 +758,7 @@ namespace {
     int outflanking =  distance<File>(pos.square<KING>(WHITE), pos.square<KING>(BLACK))
                      - distance<Rank>(pos.square<KING>(WHITE), pos.square<KING>(BLACK));
 
-    bool pawnsOnBothFlanks =   (pos.pieces(PAWN) & QueenSide)          
+    bool pawnsOnBothFlanks =   (pos.pieces(PAWN) & QueenSide)
                             && (pos.pieces(PAWN) & KingSide);
 
     // Compute the initiative bonus for the attacking side
@@ -795,9 +795,10 @@ namespace {
         if (   pos.opposite_bishops()
             && pos.non_pawn_material(WHITE) == BishopValueMg
             && pos.non_pawn_material(BLACK) == BishopValueMg)
-            sf = 31;
+            sf = 8 + 4 * pe->pawn_asymmetry();
         else
             sf = std::min(40 + (pos.opposite_bishops() ? 2 : 7) * pos.count<PAWN>(strongSide), sf);
+
     }
 
     return ScaleFactor(sf);