From: Gary Linscott <glinscott@gmail.com>
Date: Wed, 13 Feb 2013 17:19:54 +0000 (-0500)
Subject: Merge branch 'simplify_eval' into bishop_pin_clop
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=671f24ff355dd1a92a2c5eabfe3d482ccc4ffe73;hp=30c2e3828a5ea143e6190680dcd8e9d93fd17840

Merge branch 'simplify_eval' into bishop_pin_clop
---

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 984a85a6..56bcbc68 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -150,6 +150,8 @@ namespace {
 
   #undef S
 
+  Score BishopPinBonus = make_score(66, 11);
+
   // Bonus for having the side to move (modified by Joona Kiiski)
   const Score Tempo = make_score(24, 11);
 
@@ -306,6 +308,8 @@ namespace Eval {
         KingDangerTable[0][i] = apply_weight(make_score(t, 0), make_score(KingDanger[0], 0));
         KingDangerTable[1][i] = apply_weight(make_score(t, 0), make_score(KingDanger[1], 0));
     }
+
+    BishopPinBonus = make_score(Options["pin_open"], Options["pin_end"]);
   }
 
 
@@ -581,6 +585,11 @@ Value do_evaluate(const Position& pos, Value& margin) {
         // of threat evaluation must be done later when we have full attack info.
         if (ei.attackedBy[Them][PAWN] & s)
             score -= ThreatenedByPawnPenalty[Piece];
+        else if (Piece == BISHOP && (PseudoAttacks[Piece][pos.king_square(Them)] & s)) {
+             const Bitboard between = BetweenBB[s][pos.king_square(Them)] & pos.pieces();
+             if (!more_than_one(between))
+                 score += BishopPinBonus;
+        }
 
         // Bishop and knight outposts squares
         if (    (Piece == BISHOP || Piece == KNIGHT)
diff --git a/src/ucioption.cpp b/src/ucioption.cpp
index e59a43a9..bc4a6481 100644
--- a/src/ucioption.cpp
+++ b/src/ucioption.cpp
@@ -87,6 +87,8 @@ void init(OptionsMap& o) {
   o["Slow Mover"]                  = Option(100, 10, 1000);
   o["UCI_Chess960"]                = Option(false);
   o["UCI_AnalyseMode"]             = Option(false, on_eval);
+  o["pin_open"] = Option(66, -100, 100, on_eval);
+  o["pin_end"] = Option(11, -100, 100, on_eval);
 }