This book thoroughly explains Omaha, the action-packed poker form that uses four cards in your hand. It was originally printed in 1984, then greatly expanded in the Millennium Edition (1999) to give deeper coverage of the popular form for limit play, high-low split eight-or-better. Ciaffone has now republished it in 2006 under the new title 'Omaha Poker.' The entire book has been rewritten, with 20 extremely informative pages added on pot-limit Omaha high. If you have an earlier edition of the book, no need to buy the new one -- unless your game is pot-limit Omaha high, in which case you need the new book big time.