Checkmate, furnishes the limit to the series; the game and X vanish together.
This is in perfect keeping with the law of continuity, which acts and dominates from beginning to end of the series, and so long as any part of X remains.
Hence to permit either White or Black to move any piece, leaving his King in check, is an anomaly.
Denial to the Pawn of ability to move to the rear is an accurate interpretation of military ethics.
Of those puerile hypotheses common to the man who does not know, one of the most entrancing to the popular mind, is the notion that Corps d’armee properly are of equal numbers and of the same composition.
This supposition is due to ignorance of the fact that the multifarious duties of applied Strategetics, require for their execution like variety of instruments, which diversity of means is strikingly illustrated by the differing movements of the Chess-pieces.
The inability of the Pawn to move backward strategically harmonizes with its functions as a Corps of Position, in contradiction to the movements of the pieces, which latter are Corps of Evolution.
This restriction in the move of the Pawn is in exact harmony with the inability of the Queen to move on obliques, of the Rook to move on obliques or on diagonals, of the Bishop to move on obliques, verticals and horizontals, of the Knight to move on diagonals, verticals, and horizontals, and of the King to move like any other piece.