From 732323178680bddd3e45d43b3a5da1990133e723 Mon Sep 17 00:00:00 2001
From: jhellis3 <jhellis3@gmail.com>
Date: Wed, 1 May 2013 02:37:50 -0500
Subject: [PATCH] Tweak Mobility Area

Only consider pawns and the king as restricting.
---
 src/evaluate.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 02d740ec..a06fcabd 100644
--- 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
-    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);
-- 
2.39.2