no three pawns lie on the same line
... that one can place 16 pawns on a chessboard such that no three pawns lie on the same line?
... that one can place 16 pawns on a chessboard such that <b id="mwBA4"><a href="./No-three-in-line_problem" id="mwBA8" rel="mw:WikiLink" title="No-three-in-line problem">no three pawns lie on the same line</a></b>?