penalty for more material if losing. bench 3568335

xoto10 · Nov 8, 2018 · 879f285 · 879f285
1 parent 5cd9f6c
commit 879f285
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Showing 2 changed files with 8 additions and 3 deletions.
diff --git a/src/evaluate.cpp b/src/evaluate.cpp
@@ -858,8 +858,13 @@ namespace {
         Trace::add(TOTAL, score);
     }
 
-    return  (pos.side_to_move() == WHITE ? v : -v) // Side to move point of view
-           + Eval::Tempo;
+    v = (pos.side_to_move() == WHITE ? v : -v) // Side to move point of view
+        + Eval::Tempo;
+    // Penalty for more material on board if losing
+    if (v < 0)
+        v -= pos.non_pawn_material(pos.side_to_move()) / 512;
+
+    return  v;
   }
 
 } // namespace

diff --git a/src/search.cpp b/src/search.cpp
@@ -392,7 +392,7 @@ void Thread::search() {
               beta  = std::min(previousScore + delta, VALUE_INFINITE);
 
               // Adjust contempt based on root move's previousScore (dynamic contempt)
-              int dct = ct + 88 * previousScore / (abs(previousScore) + (previousScore<0 ? 100 : 200));
+              int dct = ct + 88 * previousScore / (abs(previousScore) + 200);
 
               contempt = (us == WHITE ?  make_score(dct, dct / 2)
                                       : -make_score(dct, dct / 2));