The Complexity/Experience rating is a tool to help GM's target their events to a particular audience, and to help players identify games that will be appropriate to their experience and style of gaming. The "C/E" rating will appear as a number/letter as outlined below. Unrated events will have a C/E rating of -/-.
1 = Simple. Generally less than four pages of rules and very few calculations or modifiers.
2 = Average complexity. Games with a longer set of rules, use of expansion rules and some calculations or modifiers. Though more complex than "simple", this game could still be taught to an inexperienced, but quick-to-learn player.
3 = Complex. Games that are large and detailed. These games may use multiple sourcebooks, rules, variants, varying victory conditions and more. This type of game might usually be taught to new players in a "demo" style, rather than in a competive or experienced game.
A = None. The game master will teach all rules for inexperienced players.
B = Some. Little or no experience in this rule system is needed, but familiarity with the type of game is preferred. The GM may introduce and teach variants on the game, but will not specifically be teaching the entire game. She may also help with rules and mechanics as questions arise.
C = Required. Likely, a "C" rated game is highly competitive. The GM will not be teaching rules, and prefers players that are completely familiar with the system. If you've never played this game before, please don't enroll in this event.
A rating of 1/B means the game is simple, but the GM would like players with some experience. (I.E., the Time's Up family game.)
A rating of 3/C means the GM wants only people who have played this rules system and the game is complex. (I.E. an Age of Renaissance tournament.)
A rating of 3/A means it's a complex game, but open to anyone. The GM is willing to teach all rules needed to play. (I.E. a D&D adventure for 1st level characters.)