Simplify KBPKB endgame with opposite bishops

[stockfish] / src / evaluate.cpp

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 69c3278556ab856026f556b49ec9614680fd5a1e..f4811aea82433945cf77d9ffcfc9191aa23f05ad 100644 (file)
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -800,11 +800,10 @@ namespace {
     {
         if (pos.opposite_bishops())
         {
     {
         if (pos.opposite_bishops())
         {

-            // Endgame with opposite-colored bishops and no other pieces (ignoring pawns)
-            // is almost a draw, in case of KBP vs KB, it is even more a draw.
+            // Endgame with opposite-colored bishops and no other pieces is almost a draw

             if (   pos.non_pawn_material(WHITE) == BishopValueMg
                 && pos.non_pawn_material(BLACK) == BishopValueMg)
             if (   pos.non_pawn_material(WHITE) == BishopValueMg
                 && pos.non_pawn_material(BLACK) == BishopValueMg)

-                sf = more_than_one(pos.pieces(PAWN)) ? 31 : 9;
+                sf = 31;

 
             // Endgame with opposite-colored bishops, but also other pieces. Still
             // a bit drawish, but not as drawish as with only the two bishops.
 
             // Endgame with opposite-colored bishops, but also other pieces. Still
             // a bit drawish, but not as drawish as with only the two bishops.