Ace, king, queen, knave (in trumps).
Lead knave, then ace.
With more than four in suit, lead queen after ace.
With only four in suit, lead king after ace.
Ace, king, queen, knave (in plain suits).
Lead king, then knave.
With more than four in suit, lead queen after knave.
With only four in suit, lead ace after knave.
Ace, king, queen, with or without small ones (in trumps).
Lead queen.