Both must be on solid ground or a landing ship, mostly intact, and stationary, on the same flight. Starship must have flown to over 100 km on that flight.
For details, this question will use the same criteria as these:
/chrisjbillington/will-spacex-land-a-spaceflown-stars
/chrisjbillington/will-spacex-land-a-super-heavy-boos
/EvanDaniel/which-happens-first-starship-superh
Answers are for "on or before flight number X", so if they succeed on flight 11, then answers 11, 12, 13, etc. all resolve Yes, regardless of the outcome of flight 12.
I'll add more answers as future flights approach, as indicated by prices on existing answers.
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"This matches a recent comment by Musk, who said SpaceX will likely attempt to catch and recover Starship back at Starbase somewhere around Flight 13 to 15, depending on the outcomes of the next couple of test flights."
@Eliza I assume so. They've announced booster catch plans or lack thereof fairly consistently. They file NOTAMs for splashdown zones.
@SimonWestlake I'm not sure I want to spend the mana on that, but I made it so or people can add options. Go for it if you want!