Retire loose enemies bonus

[stockfish] / src / evaluate.cpp

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 2c5f130343ecc1f58bbe02a0eaaaad1928faa7eb..6cd33bd503de049c65da7984259f754fce94721f 100644 (file)
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -190,7 +190,6 @@ namespace {
   const Score OtherCheck          = S(10, 10);
   const Score CloseEnemies        = S( 7,  0);
   const Score PawnlessFlank       = S(20, 80);
-  const Score LooseEnemies        = S( 0, 25);
   const Score ThreatByHangingPawn = S(71, 61);
   const Score ThreatByRank        = S(16,  3);
   const Score Hanging             = S(48, 27);
@@ -515,11 +514,6 @@ namespace {
     Bitboard b, weak, defended, safeThreats;
     Score score = SCORE_ZERO;
 
-    // Small bonus if the opponent has loose pawns or pieces
-    if (   (pos.pieces(Them) ^ pos.pieces(Them, QUEEN, KING))
-        & ~(ei.attackedBy[Us][ALL_PIECES] | ei.attackedBy[Them][ALL_PIECES]))
-        score += LooseEnemies;
-
     // Non-pawn enemies attacked by a pawn
     weak = (pos.pieces(Them) ^ pos.pieces(Them, PAWN)) & ei.attackedBy[Us][PAWN];
 
@@ -667,10 +661,6 @@ namespace {
                 mbonus += rr + r * 2, ebonus += rr + r * 2;
         } // rr != 0
 
-        // Assign a small bonus when the opponent has no pieces left
-        if (!pos.non_pawn_material(Them))
-            ebonus += 20;
-
         // Scale down bonus for candidate passers which need more than one pawn
         // push to become passed.
         if (!pos.pawn_passed(Us, s + pawn_push(Us)))