Matchpoints.
Trick 1: ♠4 (4th best), 2, 6 (standard attitude), A
You want to go to dummy for your two discards on good spades...do you take the club finesse to get there, risking the diamond tricks if it's off? Or do you play to the ♣A and take a sure thing?
If field matters to you, this is in North American Pairs B district finals. North is known to be good "B" player, South is unknown.