The short answer
The winner is the highest legal trump played. If nobody plays trump, the winner is the highest card in the suit that was led. Off-suit non-trump cards cannot win.
Winner
Player 3: 3♠
3♠ is the highest trump in this trick.
Important legality note
This tool evaluates the winner from the cards shown. It cannot verify whether an off-suit card was legal because legality depends on the player’s hidden hand: a player must follow the led suit when able.
Frequently asked questions
Does the highest number always win a Spades trick?
No. Trump beats non-trump, and if nobody trumps, only cards in the suit led can win the trick.
Can this calculator tell whether a play was legal?
It can determine the winner of the four cards shown, but it cannot know whether a player was required to follow suit because it does not know that player’s full hand.
Does it support JJDD?
Yes. JJDD uses Big Joker, Little Joker, 2♦, 2♠, then A♠ at the top of the trump ladder, with 2♦ treated as pure trump.