One of the coolest Flash Chess games around is Spark Chess. It is a great game, with 3 free levels and one advanced level if you would like to purchase the game. The graphics are awesome, a nice clean chess layout with sharp looking chess pieces. This game will help you sharpen your game and hone your chess playing skills.
The game has three free levels they are beginner, casual and advanced. There is also a Guru level in the purchased portion of the game.