Retire loose enemies bonus

STC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 44727 W: 7943 L: 7862 D: 28922

LTC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 148343 W: 19044 L: 19088 D: 110211

Bench: 5669076

Closes #1005

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 554d9ae38695a19653d6daa45c699df3d07f1643..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 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);
   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;
 
     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];
 
     // Non-pawn enemies attacked by a pawn
     weak = (pos.pieces(Them) ^ pos.pieces(Them, PAWN)) & ei.attackedBy[Us][PAWN];