Schmieren
You can't always win a trick yourself — but you can still make it worth more. Schmieren means dropping a high-point card onto a trick your own side is about to win, banking Augen you couldn't have scored any other way.
Partner leads the Club Jack — nothing beats it. Your Ace of Hearts has nowhere better to go.
When it's safe
If your partner's card can't be beaten (the last trump out, or a card nobody can follow or overtrump), adding to it is free money. Drop your highest-value spare, Ace or Ten, without a second thought.
When it's risky
If the trick could still be stolen (an opponent might follow higher, or trump in), a fat card you add goes to them instead of you. Play low until the trick is actually decided.
Playing for Schneider
Augen only count once they're banked in a won trick. Near the 30/90 line, every card you add can push the Schneider threshold the right way — or the wrong one, if you feed the losing side instead.