39. Perpetual block is a draw. (See examples in Diagrams 99 and 100)
Diagram 99: Red (in Capital) moves first
C21 c98
C12 c89
C21 c98
C12 c89
C21 ....
Explanation:
The Black Cannon is "perpetually threatening to checkmate" and the
Red Cannon is "perpetually blocking". Neither side violates the
rule and the game can be a draw.
Diagram 100: Red (in Capital) moves first
R24 c86
R41 c69
R18 c12
R83 c97
R34 c76
....
Explanation:
Neither side violates the rule. It is a draw.