X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fevaluate.cpp;h=6b329bb0def455471fcf6302f6ce5722de69215a;hp=d8017065f0941b009e5d917da2f07d25a3a79ede;hb=d5b24ad77b546b66d52ebde2bacfaaacddf1e7f3;hpb=87886128288a82dabc78c2ce6dd688f42eaf8212

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index d8017065..6b329bb0 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -132,21 +132,21 @@ namespace {
   // Outpost[knight/bishop][supported by pawn] contains bonuses for knights and
   // bishops outposts, bigger if outpost piece is supported by a pawn.
   const Score Outpost[][2] = {
-    { S(42,11), S(63,17) }, // Knights
-    { S(18, 5), S(27, 8) }  // Bishops
+    { S(43,11), S(65,20) }, // Knights
+    { S(20, 3), S(29, 8) }  // Bishops
   };
 
   // ReachableOutpost[knight/bishop][supported by pawn] contains bonuses for
   // knights and bishops which can reach an outpost square in one move, bigger
   // if outpost square is supported by a pawn.
   const Score ReachableOutpost[][2] = {
-    { S(21, 5), S(31, 8) }, // Knights
-    { S( 8, 2), S(13, 4) }  // Bishops
+    { S(21, 5), S(35, 8) }, // Knights
+    { S( 8, 0), S(14, 4) }  // Bishops
   };
 
   // RookOnFile[semiopen/open] contains bonuses for each rook when there is no
   // friendly pawn on the rook file.
-  const Score RookOnFile[2] = { S(19, 10), S(43, 21) };
+  const Score RookOnFile[2] = { S(20, 7), S(45, 20) };
 
   // ThreatBySafePawn[PieceType] contains bonuses according to which piece
   // type is attacked by a pawn which is protected or is not attacked.
@@ -181,12 +181,13 @@ namespace {
   // Assorted bonuses and penalties used by evaluation
   const Score MinorBehindPawn     = S(16,  0);
   const Score BishopPawns         = S( 8, 12);
-  const Score RookOnPawn          = S( 7, 27);
+  const Score RookOnPawn          = S( 8, 24);
   const Score TrappedRook         = S(92,  0);
   const Score Checked             = S(20, 20);
-  const Score ThreatByHangingPawn = S(70, 63);
-  const Score Hanging             = S(48, 28);
-  const Score ThreatByPawnPush    = S(31, 19);
+  const Score ThreatByHangingPawn = S(71, 61);
+  const Score LooseEnemies        = S( 0, 25);
+  const Score Hanging             = S(48, 27);
+  const Score ThreatByPawnPush    = S(38, 22);
   const Score Unstoppable         = S( 0, 20);
 
   // Penalty for a bishop on a1/h1 (a8/h8 for black) which is trapped by
@@ -208,10 +209,10 @@ namespace {
 
   // Penalties for enemy's safe checks
   const int QueenContactCheck = 89;
-  const int QueenCheck        = 50;
+  const int QueenCheck        = 52;
   const int RookCheck         = 45;
-  const int BishopCheck       = 6;
-  const int KnightCheck       = 14;
+  const int BishopCheck       = 5;
+  const int KnightCheck       = 17;
 
 
   // eval_init() initializes king and attack bitboards for a given color
@@ -469,6 +470,11 @@ 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];