18. A Rook cannot perpetually chase an unprotected Cannon even if the Cannon is perpetually threatening to checkmate, has a check, or has a check and a chase. A Rook also cannot perpetually chase an unprotected Cannon even if both Cannon's reacting moves are attacking two different pieces. (See example in in Diagram 32 to 38)


Diagram 32: Red (in Capital) moves first

R8=9 c1=5
R9=5 c5=1
R5=9 c1=5
R9=5 c5=1
R5=9 ...

Diagram 33: Red (in Capital) moves first

R2=1 c9=8
R1=2 c8=9
R2=1 c9=8
R1=2 ...

Explanation:
In Diagrams 32 and 33, Red violates the rule by having the Rook perpetually chasing the unprotected Cannon.

Diagram 34: Red (in Capital) moves first

R3=2 c8=3
R2=7 c3=8
R7=2 c8=3
R2=7 c3=8
R7=2 ...

Diagram 35: Red (in Capital) moves first

R6=3 c7=3
R3=7 c3=7
R7=3 c7=3
R3=7 c3=7
R7=3 ...

Explanation:
In Diagrams 34 and 35, Black's perpetually threatening to checkmate does not violate the rule but Red's perpetual chase does. Red has to change or lose.

Diagram 36: Red (in Capital) moves first

R2=7 c3=7
R7=3 c7=3
R3=7 c3=7
R7=3 c7=3
R3=7 ...

Explanation:
Black Cannon's attack on the two Red Knights does not violate the rule but Red Rook's perpetually chasing the Black Cannon does. Red has to change.

Diagram 37: Red (in Capital) moves first

R8+1 c1+1
R8-1 c1-1
R8+1 c1+1
R8-1 c1-1
R8+1 ....

Explanation:
Black Cannon's "one check and one chase" is allowed but not Red Rook's perpetual chasing of the Black Cannon. Red has to change.

Diagram 38: Red (in Capital) moves first

R1=7 c3=8
R7=2 c8=3
R2=7 c3=8
R7=2 c8=3
R2=7 ...

Explanation:
Black Cannon's one check and one chase do not violate the rule, Red Rook's perpetual chasing of the Black Cannon does. Red has to change.

Back to Asia rule - Contents