From: Gary Linscott <glinscott@gmail.com>
Date: Sat, 2 Feb 2013 15:19:59 +0000 (-0500)
Subject: Simplify eval take 2.  Bench 5097444
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=a72710c66038f3c5abc8ba84d6a36c49c55d1b6c;hp=9f94d2280110a1ba5eb9eb15b0756883037a817d

Simplify eval take 2.  Bench 5097444
---

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 49dc07fe..984a85a6 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -577,18 +577,6 @@ Value do_evaluate(const Position& pos, Value& margin) {
 
         mobility += MobilityBonus[Piece][mob];
 
-        // Add a bonus if a slider is pinning an enemy piece
-        if (   (Piece == BISHOP || Piece == ROOK || Piece == QUEEN)
-            && (PseudoAttacks[Piece][pos.king_square(Them)] & s))
-        {
-            b = BetweenBB[s][pos.king_square(Them)] & pos.pieces();
-
-            assert(b);
-
-            if (!more_than_one(b) && (b & pos.pieces(Them)))
-                score += ThreatBonus[Piece][type_of(pos.piece_on(lsb(b)))];
-        }
-
         // Decrease score if we are attacked by an enemy pawn. Remaining part
         // of threat evaluation must be done later when we have full attack info.
         if (ei.attackedBy[Them][PAWN] & s)
@@ -699,8 +687,7 @@ Value do_evaluate(const Position& pos, Value& margin) {
                       & ~ei.attackedBy[Them][0];
 
     if (undefendedMinors)
-        score += more_than_one(undefendedMinors) ? UndefendedMinorPenalty * 2
-                                                 : UndefendedMinorPenalty;
+        score += UndefendedMinorPenalty;
 
     // Enemy pieces not defended by a pawn and under our attack
     weakEnemies =  pos.pieces(Them)