By the loss of the great central diagonal, the mobility of the opposing army is correspondingly decreased.
It therefore is clear that the object of any series of movements by a Chessic army acting otherwise than on Line of Operations, should be:
PRINCIPLE
Form the kindred army upon the hypothenuse of the right angled triangle which is contained within the Dynamic surface of the Chess-board; and conversely,
Compel the adverse army to act exclusively within that semi-circle which appertains to the same surface.
Under these circumstances, the kindred corps will be possessed of facilities for movement represented by thirty-six squares; while the logistic area of the opposing army will be restricted to twenty-eight squares.
There are, of course, two great central diagonals of the Chess-board; but as the student is fully informed that great central diagonal always is to be selected, which extends towards the Objective Plane.
Mobility, per se, increases or decreases with the number of squares open to occupation.