"Always deploy," says Franklin K. Young, "so that the right oblique can be readily established in case the objective plane remains open or becomes permanently located on the centre or on the King's wing, or that the crochet aligned may readily be established if the objective plane becomes permanently located otherwise than at the extremity of the strategic front."  If this is somewhat obscure (and I see no reason to believe otherwise), the conclusion it reaches is stated in limpid prose by the same writer: