Refine statscore for captures

Vizvezdenec · Disservin · commit afaf3a0f2a06 · 2024-12-08T19:57:59.000+01:00
Continuation of previous attempts there. Now instead of using capture history with a static offset also add the value of the captured piece in the same way at it is used in movepicker. Passed STC: https://tests.stockfishchess.org/tests/view/674aa3d386d5ee47d95404aa LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 116480 W: 30433 L: 29999 D: 56048 Ptnml(0-2): 361, 13720, 29662, 14118, 379 Passed LTC: https://tests.stockfishchess.org/tests/view/674c4b2d86d5ee47d954073f LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 133542 W: 34365 L: 33847 D: 65330 Ptnml(0-2): 78, 14585, 36934, 15089, 85 closes #5706 Bench: 934447
diff --git a/src/search.cpp b/src/search.cpp
@@ -1180,7 +1180,10 @@ Value Search::Worker::search(
             r -= 1879;
 
         if (capture)
-            ss->statScore = 0;
+            ss->statScore =
+              7 * int(PieceValue[pos.captured_piece()])
+              + thisThread->captureHistory[movedPiece][move.to_sq()][type_of(pos.captured_piece())]
+              - 5000;
         else
             ss->statScore = 2 * thisThread->mainHistory[us][move.from_to()]
                           + (*contHist[0])[movedPiece][move.to_sq()]
