Tweak Mobility Area

Only consider pawns and the king as restricting.

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 02d740eccbc765b32386592fdab902e2a7c31d3f..a06fcabd02baac3335e376d4a5988e95680a6f08 100644 (file)
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -690,7 +690,7 @@ Value do_evaluate(const Position& pos, Value& margin, Info& ei) {
     Score score = mobility = SCORE_ZERO;
 
     // Do not include in mobility squares protected by enemy pawns or occupied by our pieces
     Score score = mobility = SCORE_ZERO;
 
     // Do not include in mobility squares protected by enemy pawns or occupied by our pieces

-    const Bitboard mobilityArea = ~(ei.attackedBy[Them][PAWN] | pos.pieces(Us));
+    const Bitboard mobilityArea = ~(ei.attackedBy[Them][PAWN] | pos.pieces(Us, PAWN, KING));

 
     score += evaluate_pieces<KNIGHT, Us, Trace>(pos, ei, mobility, mobilityArea);
     score += evaluate_pieces<BISHOP, Us, Trace>(pos, ei, mobility, mobilityArea);
 
     score += evaluate_pieces<KNIGHT, Us, Trace>(pos, ei, mobility, mobilityArea);
     score += evaluate_pieces<BISHOP, Us, Trace>(pos, ei, mobility, mobilityArea);