A primary wager is placed by a primary player regarding an outcome of a gaming event, and a secondary wager is placed by a secondary player regarding an outcome of the primary wager. Tertiary wagers may also be placed regarding an outcome of the secondary wager. The outcome of the gaming event is determined....http://www.google.de/patents/US7427234?utm_source=gb-gplus-sharePatent US7427234 - Method, apparatus and article for hierarchical wagering
