Fix Reversi style piece flips

between_bb was redefined in an upstream merge,
which broke the implementation for Reversi/Othello.

diff --git a/src/position.cpp b/src/position.cpp
index 2e79820..d1a1c1f 100644 (file)
--- a/src/position.cpp
+++ b/src/position.cpp
@@ -1502,7 +1502,7 @@ void Position::do_move(Move m, StateInfo& newSt, bool givesCheck) {
       {
           Bitboard b = attacks_bb(us, QUEEN, to, board_bb() & ~pieces(~us)) & ~PseudoAttacks[us][KING][to] & pieces(us);
           while(b)
-              st->flippedPieces |= between_bb(to, pop_lsb(b));
+              st->flippedPieces |= between_bb(pop_lsb(b), to) ^ to;
       }
       else
       {