This article is from the Table Tennis (Ping Pong) FAQ, by ttennis@bu.edu with numerous contributions by others.
Tournaments are classified as open, closed, or invitational. Open
tournaments allow any player to participate. A closed tournament is
limited to players in a specific geographical area or organization. An
invitational tournament is when the participants are chosen by the
tournament committee and invited to play. Club and city championships are
"closed" tournaments.
 
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