From: jhellis3 <jhellis3@gmail.com>
Date: Wed, 1 May 2013 07:37:50 +0000 (-0500)
Subject: Tweak Mobility Area
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=732323178680bddd3e45d43b3a5da1990133e723

Tweak Mobility Area

Only consider pawns and the king as restricting.
---

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);