Regarded as a Chessic Corps d’armee the Rook marches and attacks as
infantry, cavalry and artillery.
From one to four Rooks may be present in any given Strategetic Horizon;
and whenever present the effect of its co-operation mathematically is
outlined, viz.:
At her maximum of efficiency, the Rook occupies the common angle of four
quadrilaterals, whose aggregate area always is 14 points. The Offensive
Power of the Rook is equally valid against all these points, but his
defensive power is valid for the support of only two points.