lg-checkers is our solution to the Lookingglass Cybersolutions challenge at the 2014 Baltimore Hackathon.
It's built with Clojurescript, Reagent (A cljs interface to React.js), and Datascript, an immutable database and Datalog query engine in Clojurescript.
It does most of what you'd expect from a game of checkers, plus time travel.
(MORE STUFF HERE)
The original challenge skeleton is here, and the challenge description is at CHALLENGE.md.
Pull requests are welcome!