Some people were concerned that WP7 wouldn’t have a lot of multiplayer real time games. The reasons is because MS did not provide some developer tools for this. MS provided turn by turn games (like chess) but not real time multiplayer games where both players play simultaneously. Anyway, here’s a clip of a multiplayer online chess game.
The developer also has additional functions here. You can watch others playing online, attend a chess lecture, practice endgames and configure your account. The developers site doesn’t have a lot of info about the app so we’ll just have to wait and see.