[scolex]

I've implemented rules of https://en.wikipedia.org/wiki/Whist in prolog https://github.com/scolex/prolog-whist/blob/master/whist.pl some yeas ago as school project. Unfortunately comments are in czech language.

[LectronPusher]

My university has an infamous project of implementing Euchre (another trick-taking game) in C++ in one of the early programming courses. It's a nice fundamental problem for dealing with objects, agents, and logic.