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QFS is an adaptation of the old school playground version of childhood foursquare. Quantum Four Square is played on a square court divided into four smaller squares that meet in the center. The combination of worldwide styles in OS foursquare has led to an intense and competitive design of play using a [tennis ball]. QFS is gaining popularity amongst teachers and students in their classrooms. The QFS [International] Alliance Board of [Representative] Trustees is based in San Diego and run tournaments monthly.
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