Scale down endgames with pawns on one or two adjacent files

[stockfish] / src / pawns.h

diff --git a/src/pawns.h b/src/pawns.h
index 28fe1c075ed9ae344dbfc052058ff7ba80a2ac15..6124246229696291b3cfa162ba7cc1f87e83c374 100644 (file)
--- a/src/pawns.h
+++ b/src/pawns.h
@@ -45,6 +45,10 @@ struct Entry {
     return semiopenFiles[c] & (leftSide ? (1 << f) - 1 : ~((1 << (f + 1)) - 1));
   }
 
     return semiopenFiles[c] & (leftSide ? (1 << f) - 1 : ~((1 << (f + 1)) - 1));
   }
 

+  int pawn_span(Color c) const {
+    return pawnSpan[c];
+  }
+

   int pawns_on_same_color_squares(Color c, Square s) const {
     return pawnsOnSquares[c][!!(DarkSquares & s)];
   }
   int pawns_on_same_color_squares(Color c, Square s) const {
     return pawnsOnSquares[c][!!(DarkSquares & s)];
   }


@@ -71,6 +75,7 @@ struct Entry {
   int minKPdistance[COLOR_NB];
   int castlingRights[COLOR_NB];
   int semiopenFiles[COLOR_NB];
   int minKPdistance[COLOR_NB];
   int castlingRights[COLOR_NB];
   int semiopenFiles[COLOR_NB];

+  int pawnSpan[COLOR_NB];

   int pawnsOnSquares[COLOR_NB][COLOR_NB]; // [color][light/dark squares]
 };
 
   int pawnsOnSquares[COLOR_NB][COLOR_NB]; // [color][light/dark squares]
 };