X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fsearch.cpp;h=8b5f3b2b6d8c6171575a31f1cb3e3afcfe8327f3;hp=829e1bbef9bb3155048e72d65e424b8ba7c2eb87;hb=4894231ff71b4132ce77cac7e01dc708bc93f426;hpb=fbdabe2975c0e86a04b01c36c9f3eec5494ecf0d

diff --git a/src/search.cpp b/src/search.cpp
index 829e1bbe..8b5f3b2b 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1549,6 +1549,7 @@ split_point_start: // At split points actual search starts from here
 
     Square f1, t1, f2, t2;
     Piece p1, p2;
+    Square ksq;
 
     assert(m1 && move_is_ok(m1));
     assert(m2 && move_is_ok(m2));
@@ -1577,16 +1578,13 @@ split_point_start: // At split points actual search starts from here
         return true;
 
     // Case 5: Discovered check, checking piece is the piece moved in m1
+    ksq = pos.king_square(pos.side_to_move());
     if (    piece_is_slider(p1)
-        &&  bit_is_set(squares_between(t1, pos.king_square(pos.side_to_move())), f2)
-        && !bit_is_set(squares_between(t1, pos.king_square(pos.side_to_move())), t2))
+        &&  bit_is_set(squares_between(t1, ksq), f2))
     {
-        // discovered_check_candidates() works also if the Position's side to
-        // move is the opposite of the checking piece.
-        Color them = opposite_color(pos.side_to_move());
-        Bitboard dcCandidates = pos.discovered_check_candidates(them);
-
-        if (bit_is_set(dcCandidates, f2))
+        Bitboard occ = pos.occupied_squares();
+        clear_bit(&occ, f2);
+        if (bit_is_set(pos.attacks_from(p1, t1, occ), ksq))
             return true;
     }
     return false;