regional divisions. 2 Only exists in some regions. Exiles Bavaria accommodates one club from Austria, the SV Kleinwalsertal, which plays in the B-Klasse Allgäu 8 in 2017–18. A number of Bavarian clubs have opted to play in the league systems of neighboring states for geographical reasons. FC Bayern Alzenau plays in the league system of Hesse, formerly with Viktoria Aschaffenburg. Viktoria's senior and junior teams now play in the Bavarian league system. A number of clubs from the border region to Württemberg, along the river Iller, play in the Württemberg league system, the most successful of those being SpVgg Au/Iller, FV Illertissen and the SpVgg Lindau. Both Viktoria Aschaffenburg and FV Illertissen returned to the Bavarian league system from 2012 onwards, taking advantage of the opportunity to play in the new Regionalliga Bayern. All up, 75 clubs from the Bavarian region of Swabia play in the Württemberg league system, 45 of those in the Donau/Iller region, the remainder spread over other border regions of the WFV. In late 2010, the idea was floated that those clubs could be forced to return to the Bavarian league system but this idea was dropped again. Rules The rules of the game in Bavaria, the Spielordnung, has a number of special clauses that, at times, differ from the standard frame work of the DFB. The BFV categorises players in three groups, amateurs, contracted players and licensed players. The Bavarian FA's definition of an amateur is a player who is not paid for its participation in a game and receives no more than €249.99 per month in compensations. It also sub-divides professionals in contracted players and licensed players. A contracted player is a player who is a member of a club who also receives payments in excess of €250 while a licensed player is a full professional. The BFV clearly defines the season as starting on 1 July of a year and finishing on 30 June the following year. It prohibits matches to be played in January, unless they are held indoors. Every club competing in the league system must have a certain number of junior teams, depending on which league they play in, with the clubs in the Landesliga and Bayernliga having to have the most, three. Every club must also provide one referee per senior team it fields. The BFV stipulates that leagues at the fourth to sixth tier of the league system