Extra bonus for capture creating a huge fail high

STC:
http://tests.stockfishchess.org/tests/view/5b114f3d0ebc596e9e0881f6
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 13007 W: 2730 L: 2541 D: 7736

LTC:
http://tests.stockfishchess.org/tests/view/5b1176740ebc59033d2d52c6
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 15594 W: 2417 L: 2239 D: 10938

See https://github.com/official-stockfish/Stockfish/pull/1627

Bench: 4790240

diff --git a/src/search.cpp b/src/search.cpp
index b87c689479d2a7909667a591d31c49b6b6cc21d4..220bf55f9beac657f10dd69eec43e0416454ea28 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1166,7 +1166,8 @@ moves_loop: // When in check, search starts from here
         if (!pos.capture_or_promotion(bestMove))
             update_quiet_stats(pos, ss, bestMove, quietsSearched, quietCount, stat_bonus(depth));
         else
-            update_capture_stats(pos, bestMove, capturesSearched, captureCount, stat_bonus(depth));
+            update_capture_stats(pos, bestMove, capturesSearched, captureCount,
+                                 stat_bonus(depth + bool(bestValue > beta + KnightValueMg) * ONE_PLY));
 
         // Extra penalty for a quiet TT move in previous ply when it gets refuted
         if ((ss-1)->moveCount == 1 && !pos.captured_piece())