Clean up previous patch

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index cae89c6a929014ce9364c60a444f188a396341c7..085bca3a8f5fce6370e908bb80b5f75cd199ca02 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -585,7 +585,7 @@ namespace {
     ss->ttMove = ttMove = RootNode ? RootMoves[PVIdx].pv[0] : ttHit ? tte->move() : MOVE_NONE;
     ttValue = ttHit ? value_from_tt(tte->value(), ss->ply) : VALUE_NONE;
 
-    // At non-PV nodes we check for a fail high/low. We don't probe at PV nodes
+    // At non-PV nodes we check for a fail high/low. We don't prune at PV nodes
     if (  !PvNode
         && ttHit
         && tte->depth() >= depth
@@ -1439,6 +1439,10 @@ moves_loop: // When in check and at SpNode search starts from here
     {
         Square prevPrevSq = to_sq((ss-2)->currentMove);
         Followupmoves.update(pos.piece_on(prevPrevSq), prevPrevSq, move);
+
+        // Extra penalty for TT move in previous ply when it gets refuted
+        HistoryStats& ttMoveCmh = CounterMovesHistory[pos.piece_on(prevPrevSq)][prevPrevSq];
+        ttMoveCmh.update(pos.piece_on(prevSq), prevSq, -bonus - 2 * depth / ONE_PLY - 1);
     }
   }