For a person that wants a Basic membership for $35 a year, they get a lot more now than they did for $40 three years ago. We now have: live National Championship each year, with East and West tournaments; an Online National Championship that is quite possibly the best test of backgammon skill of any event in the world; we now own and run the Nation’s Cup, which pits teams from over 30 nations in the Olympics of backgammon; we co-sponsor the International Backgammon Championship, which is another international competition that pits some of the world best players; we have an online Director’s Cup; we host the online Team Event for any five members that wish to form a team; we host the Local Club Championship of three-person teams, which pits the various local clubs against each other to determine a national champion recipient of a traveling trophy; we have monthly events that are very popular and give novices and intermediates a chance to play against world champions; we give instructional videos on Facebook and on the USBGF site; we host seminars and quizzes at ABT events; we teach backgammon at universities and have hosted three national collegiate championships; we keep live and online ELO ratings in the various divisions; we have designed, approved, and will soon be instituting a USBGF Master Point System, which the backgammon community has needed for a long time.. Online backgammon Questions & Answers. How do I learn the rules? To learn the rules of backgammon or improve your knowledge of them, consult our Backgammon Rules section. Can I play internet backgammon for free? You can play internet backgammon for free. To find out how, visit our Free Backgammon section. Which website should I play on?. From: Backgammon Galore: Rules of Backgammon Questions and Answers About the Rules of Backgammon. What is a "prime"? A prime is a sequence of six consecutive blocks. When a prime is in place, none of the opponent's checkers can move past as long as the prime remains intact..