12. "One check one chase" or "several checks and one chase" should be ruled as a draw. (See example in Diagram 13.)

Diagram 13: Red moves first

R2+3 k6+1
R2-9 c9-5
R2+8 k6-1
R2-3 c9-2
R2+4 k6+1
R2-2 c9+4
R2+1 k6-1
R2+1 K6+1
R2-6 ....

Red's rook checks once or several times then chase Black's cannon. Although Black's cannon is not protected, this is not a perpetual chase (Red checked), and the game should be a draw.