b = theirPawns & file_bb(f);
rkThem = b ? relative_rank(Us, frontmost_sq(Them, b)) : RANK_1;
- if ( (MiddleEdges & (f | rkThem))
+ if ( (MiddleEdges & make_square(f, rkThem))
&& file_of(ksq) == f
&& relative_rank(Us, ksq) == rkThem - 1)
safety += Value(200);