Wikipedia
SpiritWars
SpiritWars is an online, turn-based, strategy game built on the rich tradition of classic board games. It features collectible trading cards and artwork in an online format.
SpiritWars combines aspects of games like Magic: The Gathering and Chess, as well as other board war-game mechanics.
One article reported that over half a million games had been played by 2006. Unlimited free play, tournaments, league play, regular game expansions, and a friendly online gaming community made SpiritWars interesting to players that are into online strategy games.
Like the ancient game of Go, SpiritWars was designed to take a few minutes to learn and a lifetime to master.