List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=exclude_provisional&page=384
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
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                "username": "mlopezviedma",
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            "description": "#### _There will be 2 or 3 rounds, whether there are less than 8 players or not. Stronger players are welcome to kibitz (comment on games live) and choose a game or two to review with all the participants when the tournament finishes._\n\n#### _If you want to play in the tournament but it's full, please PM [me](https://online-go.com/user/view/784) so I can put you in as a substitute player. If so, please also check in and I'll notify you when ready._",
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                "name": "9x9 Lovers",
                "summary": "A group for Go players who love the 9x9 board.",
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