Retire rook contact checks

[stockfish] / src / evaluate.cpp

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 8fd405d0036fe9e41c7632b2fa108bdf77a8db25..0554f490227b51e4b60ddacb1cee315bf03c174c 100644 (file)
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -220,9 +220,8 @@ namespace {
 
   // Penalties for enemy's safe checks
   const int QueenContactCheck = 89;
-  const int RookContactCheck  = 71;
   const int QueenCheck        = 50;
-  const int RookCheck         = 37;
+  const int RookCheck         = 45;
   const int BishopCheck       = 6;
   const int KnightCheck       = 14;
 
@@ -421,23 +420,6 @@ namespace {
                 attackUnits += QueenContactCheck * popcount<Max15>(b);
         }
 
-        // Analyse the enemy's safe rook contact checks. Firstly, find the
-        // undefended squares around the king reachable by the enemy rooks...
-        b = undefended & ei.attackedBy[Them][ROOK] & ~pos.pieces(Them);
-
-        // Consider only squares where the enemy's rook gives check
-        b &= PseudoAttacks[ROOK][ksq];
-
-        if (b)
-        {
-            // ...and then remove squares not supported by another enemy piece
-            b &= (  ei.attackedBy[Them][PAWN]   | ei.attackedBy[Them][KNIGHT]
-                  | ei.attackedBy[Them][BISHOP]);
-
-            if (b)
-                attackUnits += RookContactCheck * popcount<Max15>(b);
-        }
-
         // Analyse the enemy's safe distance checks for sliders and knights
         safe = ~(ei.attackedBy[Us][ALL_PIECES] | pos.pieces(Them));