List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=min_ranking&page=5875
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
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                "summary": "Middle speed matches, not so hurry, not so slow.",
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            "name": "Sitewide August 2014 SDKs Live 9x9 - 3. August",
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                "username": "Françisa",
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            "id": 137279,
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