8. In "Two checks one check back", the perpectually checking side will be ruled as a loss. (See example in Diagram 5)

Diagram 5: Red moves first

P4=5 p6=5
P5=4 p5=6
P4=5 P6=5
P5=4 ...

When Red perpetually checks and Black "One check and one idle", Red violates the rule and Black doesn't. Red has to change to different moves, otherwise it is a loss for Red.