Haskell Fundamentals - Who Wins a Trick of Hearts?

This topic is for the [Who Wins a Trick of Hearts?][] exercise in the [Haskell Fundamentals][] trail. Post any questions, corrections, or pointers you have to share with other Upcase subscribers.
[Who Wins a Trick of Hearts?]: https://exercises.upcase.com/exercises/who-wins-a-trick-of-hearts
[Haskell Fundamentals]: https://thoughtbot.com/upcase/haskell-fundamentals