OK... maybe Scrabulous did not have to change the board layout. Actually who knows with retarded courts, but this is from the US Copyright Office
http://www.copyright.gov/fls/fl108.html
Copyright does not protect the idea for a game, its name or title, or the method or methods for playing it. Nor does copyright protect any idea, system, method, device, or trademark material involved in developing, merchandising, or playing a game. Once a game has been made public, nothing in the copyright law prevents others from developing another game based on similar principles. Copyright protects only the particular manner of an author’s expression in literary, artistic, or musical form.