When in a showdown I play an action, opening a chain. Does my focus pass automatically after that chain resolves? Or can I play another action afterwards (and keep playing actions) until I pass focus?

After a chain resolves during a showdown, Focus generally passes to your opponent. However, if it was the initial chain of the showdown (triggered by 'When I Attack/Defend' abilities), Focus does not pass, and the attacker retains Focus (Rule 343.1). You cannot play multiple actions consecutively unless your opponent chooses to pass Focus back to you without acting.

According to Rule 343: "When the last item on the chain resolves during a Showdown, Focus passes, and the next Player gains both Focus and Priority."

Showdown Sequence

1. Open State: You have Focus and play an [Action] spell or ability.
2. Closed State: A chain is created. You and your opponent may add [Reaction] cards to this chain.
3. Resolution: Once both players pass priority, the chain resolves (LIFO).
4. Focus Shift: Immediately after the last item resolves, the state becomes Open again, and Focus automatically passes to your opponent (unless it was the initial chain).
5. Opponent's Turn: Your opponent now has the choice to start a new chain with an Action/Reaction or pass Focus back to you.

Key Nuances

• Consecutive Actions: You can only play a second action if your opponent receives Focus after your first chain and chooses to Pass without playing anything.
• The "Initial Chain" Exception: If the showdown began with an "Initial Chain" (triggered by "When I Attack/Defend" abilities), Focus does not pass after that specific chain resolves. The attacker retains Focus to play the first Action of the showdown (Rule 343.1).
• Ending the Showdown: The showdown only ends when both players pass Focus consecutively while the state is Open (Rule 344.3.a). Passing Focus once does not lock you out; if your opponent plays a card, you will receive Focus again after their chain resolves.