Seven players, round two. P2 said "Dapp!"; P3, P4 and P5 passed, and you are P6.
Your hand
Do you call "Challenge!"?
Answer
Call “Challenge!”. The Skus is a trump stop by itself, so this is a hand you would claim yourself, even with one Tarok. If the bidder hands you the Dapp, the twelve cards rebuild your hand around the Skus; if they keep it, the hand pays double.
Rule: Call Challenge with a hand you would claim yourself, a trump stop on the ladder, and pass without one. The bidder chooses whether you play it, and either way the hand pays double.