From: Reuven Peleg <reuvenpe2005@gmail.com>
Date: Thu, 12 Sep 2013 13:20:53 +0000 (+0300)
Subject: Increase passed bonus for having more pieces
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=fc17d0de7748b68bddc5cd7f97a6c15ebc7adaac

Increase passed bonus for having more pieces

Passed both short TC:
LLR: 2.95 (-2.94,2.94) [-1.50,4.50]
Total: 36463 W: 7575 L: 7365 D: 21523

And long TC:
LLR: 2.97 (-2.94,2.94) [0.00,6.00]
Total: 2953 W: 564 L: 446 D: 1943

bench: 3846852
---

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 42f7addf..a16fc359 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -872,9 +872,16 @@ Value do_evaluate(const Position& pos, Value& margin) {
         {
             if (pos.non_pawn_material(Them) <= KnightValueMg)
                 ebonus += ebonus / 4;
+
             else if (pos.pieces(Them, ROOK, QUEEN))
                 ebonus -= ebonus / 4;
         }
+
+        // Increase the bonus if we have more non-pawn pieces
+        if (pos.count<ALL_PIECES>(  Us) - pos.count<PAWN>(  Us) >
+            pos.count<ALL_PIECES>(Them) - pos.count<PAWN>(Them))
+            ebonus += ebonus / 4;
+
         score += make_score(mbonus, ebonus);
 
     }