From: Marco Costalba <mcostalba@gmail.com>
Date: Fri, 3 May 2013 08:10:08 +0000 (+0200)
Subject: Merge mobility area tweak
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=43f67eab5f55508e07e4e3d7cec885dc4e82036f;hp=d44ac0a4850f389ee2fdb8812104150c323d9ec2

Merge mobility area tweak

A nice improvment.

Was good at 15+0.05
LLR: 2.96 (-2.94,2.94)
Total: 10731 W: 2176 L: 2040 D: 6515

And at 60"+0.05
LLR: 2.96 (-2.94,2.94)
Total: 10601 W: 1968 L: 1810 D: 6823

bench: 4676606
---

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index e861f5f0..5a8a292f 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -730,7 +730,7 @@ Value do_evaluate(const Position& pos, Value& margin) {
     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);