I am a big enthusiast of chess variants, and here are my favorites: English Progressive Chess Magnetic Chess Knight-Relay Chess Grand Chess Avalanche Chess Glinski Hexagonal Chess Fortress Chess
I've also developed an affinity for Ice Chess since it was added.
(hide) If you are waiting for your turn, click on "change" next to the "refresh" on the main page, then set refresh the page to 30 seconds to get your turn to move displayed faster. (Servant) (show all tips)