The Lincoln Board

Circular Chess Board Game.
Circular chess dates back nearly 1,000 years, historical records held in the British Library suggest. The game was revived in Lincoln in 1983, and the city hosts an international annual tournament.

This may come as a surprise to players who consider the square board to be the game's authentic archetype, but the circular version is not the modern day "gimmick" that people might be tempted to take it for. There is reliable historical material which suggests that circular chess goes back a very long way. And it is even thought that the great Ala'addin would have been familiar with the game in early 15th century India.
Visit their website, for online games, and test your skill by trying to figure out the next move.