Adjust statscore for captures

Instead of using quiet histories use capture history with a different offset.
official-pikafish · Nov 14, 2024 · 2cdfdcf · 2cdfdcf
1 parent 936df37
commit 2cdfdcf
Showing 1 changed file with 8 additions and 3 deletions.
diff --git a/src/search.cpp b/src/search.cpp
@@ -1089,9 +1089,14 @@ Value Search::Worker::search(
         else if (move == ttData.move)
             r -= 2;
 
-        ss->statScore = 2 * thisThread->mainHistory[us][move.from_to()]
-                      + (*contHist[0])[movedPiece][move.to_sq()]
-                      + (*contHist[1])[movedPiece][move.to_sq()] - 4241;
+        if (capture)
+            ss->statScore =
+              thisThread->captureHistory[movedPiece][move.to_sq()][type_of(pos.captured_piece())]
+              - 13000;
+        else
+            ss->statScore = 2 * thisThread->mainHistory[us][move.from_to()]
+                          + (*contHist[0])[movedPiece][move.to_sq()]
+                          + (*contHist[1])[movedPiece][move.to_sq()] - 4241;
 
         // Decrease/increase reduction for moves with a good/bad history (~8 Elo)
         r -= ss->statScore / 7600;