Your group plays Kontra and the capture bonuses. P1, the Forehand, plays the Call, calls the King of Clubs and announces the Moon capture. You are P2. The Skus is in neither talon half.
P1Forehand and Declarer
P4Dealer
Your hand
You kontra only an item you can be sure must fail. Do you say Kontra on the Moon capture?
Answer
No Kontra. The Skus beats your XXI, and the Skus is not in view: if P1 or the Partner holds it, they can win the trick your XXI is in. Nothing you can see proves that the Moon capture fails.
Rule: A player who does not believe a contract or an announced bonus will succeed says Kontra, and it pays double (×2).