An Independent Border-Free Type-A Cover of Q221 and Improved Asymptotic Bounds for Queen Domination

The queen's graph $Q_n$ has the squares of the $n\times n$ chessboard as vertices, with adjacency defined by a common row, column, or diagonal. We give an explicit set of 111 pairwise nonattacking queens on $Q_{221}$. The set contains no queen on an outer row or column and satisfies the original typ