39. Perpetual block is a draw. (See examples in Diagrams 99 and 100)
Diagram 99: Red (in Capital) moves first
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
Neither side violates the rule. It is a draw.