List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=exclude_provisional&page=845
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
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                "username": "傳碁學園-學校",
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            "time_per_move": 3,
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            "name": "有段リーグ(初段以上)",
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            "description": "Primer entrenamiento luego del campeonato, ¡vamos a estrenar la corona de Glenn!",
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