No reachable outpost bonus for bishops

[stockfish] / src / evaluate.cpp

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 0963ddd606d20b6a5fdd2593537a412467f2188b..a0ad09f084baea61e850e478dc4666d7a097c44b 100644 (file)
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -135,7 +135,7 @@ namespace {
   constexpr Score KnightOnQueen      = S( 16, 12);
   constexpr Score LongDiagonalBishop = S( 45,  0);
   constexpr Score MinorBehindPawn    = S( 18,  3);
-  constexpr Score Outpost            = S( 16,  5);
+  constexpr Score Outpost            = S( 32, 10);
   constexpr Score PassedFile         = S( 11,  8);
   constexpr Score PawnlessFlank      = S( 17, 95);
   constexpr Score RestrictedPiece    = S(  7,  7);
@@ -298,11 +298,11 @@ namespace {
             // Bonus if piece is on an outpost square or can reach one
             bb = OutpostRanks & attackedBy[Us][PAWN] & ~pe->pawn_attacks_span(Them);
             if (bb & s)
-                score += Outpost * (Pt == KNIGHT ? 4 : 2);
-
-            else if (bb & b & ~pos.pieces(Us))
                 score += Outpost * (Pt == KNIGHT ? 2 : 1);
 
+            else if (Pt == KNIGHT && bb & b & ~pos.pieces(Us))
+                score += Outpost;
+
             // Knight and Bishop bonus for being right behind a pawn
             if (shift<Down>(pos.pieces(PAWN)) & s)
                 score += MinorBehindPawn;