Calling the Twenty — Puzzle X1

You are the Forehand and the Normal Game stands. Your hand: XVII, XV, XII, X, VII, IV, K♥, Q♥, C♣, J♠.

zwanzigerrufen Puzzle #175

Which Tarok do you call as your partner's badge?

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Answer

The XX. The call is always the highest Tarok you do NOT hold, and the XX is out there somewhere. Whoever holds it is now secretly yours.