groups follow different rules, those described above may not hold true for all games, but will form the basic structure of any games that take place. Key differences include the use alternative names for some of the seven squares (to be used alongside other squares keeping the names as indicated above), such as: Prince, Easy, and Tiny. Some variations on rules also include that the serve be passed to Queen should King serve 'foul' on the first attempt. Societies and pastimes Societies Magdalen has a longstanding culture of clubs and societies, frequently run and operated by boys, and some of which (such as the Climbing and Sailing clubs) charge a small annual membership fee (which is used fund club equipment and activities and in some cases improve communal school resources). Such clubs include well-established, traditional clubs like those in other schools such as the Debating Society, Chess Club, Historical Society, Model United Nations, and various musical societies including a Symphony and Concert Orchestra, the Choral Society and various jazz and chamber groups. More esoteric clubs and societies include the well-established St. Thomas More Society for Catholics, a bell-ringing club, a large Computer Science scheme, and multiple clubs for different types of Role-playing games. During lunchbreak and morning breaks, pupils frequently play in the central playground or Milham Ford, behind the main teaching block (formerly grass and now occupied by hockey / tennis courts). 'The Spit' (one of the school fields) is used during breaktimes by the Junior School, and has a fenced grass area and a Playground with swings and slides, etc. Informal activities during breaktimes include football and cricket etc., as well as Magdalen's traditional game, Kingball. CCF and CSO At the end of the L4th, pupils are allowed to take part in Combined Cadet Force (CCF), although this is optional until the end of the 5th form when pupils may choose between CCF or the Community Service Organisation (CSO). They are required to take part for the following year (Lower Sixth) on a Tuesday after school. Many continue with CCF in the Upper Sixth as well, but CSO only ever exists in Lower Sixth (until the end of the academic year 2011-2012 it was compulsory to do one or the other in the Upper Sixth also). The CCF Contingent is divided up into the Army and Royal Air Force sections. Naval and Signals sections were retired in the