How does a null contract change the declarer’s goal in skat?

In the card game skat, a null contract fundamentally shifts the declarer’s objective from capturing card points to avoiding tricks entirely.

While the declarer’s normal goal is to capture at least 61 card points in tricks, a null bid requires the declarer to lose every single trick. In this contract, there are no trumps and no card points; the cards are ranked in their natural order (ace, king, queen, jack, 10, 9, 8, 7). If the declarer wins even one trick during the play, the contract is immediately lost.1