List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=-exclude_provisional&page=4937
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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            "description": "solo gente bonita jsjsjsjjssj owo",
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            "id": 70907,
            "name": "The 30th Murase Go Group Tournament",
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                "username": "SM-SYaKo",
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