(1) A transfer to spades
(2) A minimum four card or maximum three card raise
This deal is from the EBU Spring Fours held in May.
Four three fits are notoriously difficult to play, it can be difficult to know when to draw trumps (or even to never touch trumps) and there can be many issues of timing and control.
Here South, Nicholas Greer, played in two spades and was forced immediately when the defence started with two rounds of hearts. He could see seven fairly obvious tricks and the eighth would have to come from the club suit. He played ace and another club, then won the diamond return and played another club, East continuing diamonds. He now won the second diamond and played just two rounds of spades followed by a winning club. The defence is helpless now. After ruffing the club if they return a trump (if trumps were four-two originally) you are in hand with only winners. If they play a heart that can be ruffed in dummy to score the spade nine. That leaves a diamond which declarer can ruff in hand and then play another club to force the defence to ruff, which establishes dummy's final spade.
Thanks to Nicholas Greer for reporting this deal