Double pinner bonus

Fine tune newly introduced pinner bonus score:

After 34696 games at 2"+0.05
Mod vs Orig 7474 - 7087 - 20135 ELO +3 (+- 2.4)

Signed-off-by: Marco Costalba <mcostalba@gmail.com>

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 20b852285def8e8ec16766511f827a08074147e3..540f402e7187bdbe6fbca0a1e9fe3bb81b62d8c5 100644 (file)
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -534,7 +534,7 @@ namespace {
             assert(b);
 
             if (single_bit(b) && (b & pos.pieces(Them)))
             assert(b);
 
             if (single_bit(b) && (b & pos.pieces(Them)))

-                score += ThreatBonus[Piece][type_of(pos.piece_on(first_1(b)))] / 2;
+                score += ThreatBonus[Piece][type_of(pos.piece_on(first_1(b)))];

         }
 
         // Decrease score if we are attacked by an enemy pawn. Remaining part
         }
 
         // Decrease score if we are attacked by an enemy pawn. Remaining part