List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=-analysis_enabled&page=159
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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                "summary": "You want to become World Champion or a Continental champion? Join us :)",
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            "group": {
                "id": 508,
                "name": "Fast Correspondence",
                "summary": "Tournaments for people who like to play quick correspondence games.",
                "require_invitation": false,
                "is_public": true,
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}