queens on a chessboard
... that five queens on a chessboard can attack or occupy every square on the board?
... that five <b id="mwBQQ"><a href="./Queen's_graph" id="mwBQU" rel="mw:WikiLink" title="Queen's graph">queens on a chessboard</a></b> <i id="mwBQY">(pictured)</i> can attack or occupy every square on the board?