33. Two or more pieces cannot take turns to perpetually chase a piece.

Diagram 81: Red (in Capital) moves first

R2+1 c9-2
R3+1 c9+1
R2+1 c9+1
R3-2 c9-2
R2+1 ....
.

Diagram 82: Red (in Capital) moves first

R7-5 p54
R5+7 p45
R7-5 p54
R5+7 p45
R7-5 ....

Explanation:

Diagrams 81 and 82 are examples of two pieces perpetually chasing a piece. This violates the rule and if Red continues, Red will be ruled to lose.