Trump Control
Trump decides who's still dangerous. As declarer you usually want it gone from the defenders' hands before your side-suit winners run; as a defender, sometimes the sharpest move is holding yours back.
Two trumps still out there. Leading the Club Jack now drags them both into the open.
Pulling trump
Lead trump early to strip the defenders' ability to ruff your winners later. Once trump is gone, your side-suit Aces and Tens run free.
The last trump
One trump is still out there. Pull it now and the board is clear — every remaining trick is decided by rank alone, no surprises.
Pulling with a weak trump
You don't need your best trump to pull — a low one still forces the defenders to follow or fold. Spend the cheap trump, keep the strong ones for later.
Pulling early on a thin hand
Even with few trumps, waiting can cost more than it saves — the longer trump stays out, the more chances the defenders get to ruff. Thin sometimes means fast, not patient.
The low lure
Lead a low trump to bait out a defender's higher one — you spend little, they spend their best, and your remaining trumps outrank whatever's left.
Saving trump
Not every trick calls for trump. Holding yours back keeps a threat alive for later — a trick you can still steal, or a ruff you can still make when it matters more.
Ruffing when void
No cards left in the led suit? A trump wins a trick you couldn't otherwise touch — the reason trump exists in the first place.