Try only recaptures in qsearch if depth is very low

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index ec2b1c9cee1d09ce1637bd9bed7d8b7a2e65ed0a..50dfcc0ced1dc210acb6bf8cb23ffe9c7e6458e7 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1134,7 +1134,7 @@ split_point_start: // At split points actual search starts from here
           bool doFullDepthSearch = true;
           alpha = SpNode ? sp->alpha : alpha;
 
-          if (    depth >= 3 * ONE_PLY
+          if (    depth > 3 * ONE_PLY
               && !captureOrPromotion
               && !dangerous
               && !move_is_castle(move)
@@ -1372,8 +1372,6 @@ split_point_start: // At split points actual search starts from here
         else
             ss->eval = bestValue = evaluate(pos, evalMargin);
 
-        update_gains(pos, (ss-1)->currentMove, (ss-1)->eval, ss->eval);
-
         // Stand pat. Return immediately if static value is at least beta
         if (bestValue >= beta)
         {
@@ -1395,7 +1393,7 @@ split_point_start: // At split points actual search starts from here
     // to search the moves. Because the depth is <= 0 here, only captures,
     // queen promotions and checks (only if depth >= DEPTH_QS_CHECKS) will
     // be generated.
-    MovePicker mp(pos, ttMove, depth, H);
+    MovePicker mp(pos, ttMove, depth, H, move_to((ss-1)->currentMove));
     CheckInfo ci(pos);
     Bitboard pinned = pos.pinned_pieces(pos.side_to_move());