The rule says: Delivering a double-check is worth +5, and triple-checks are worth +15
Is a double check when I am
- checking two players at one move
- checking one player with a normal double check
- checking a player that is already under check
Counting that there is a "triple check" either the rule one or three should be true because you can not give a triple check to one player by only your move. However, I am not sure if there are points for the normal double-check.