List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=-time_per_move&page=5802
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
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    "previous": "https://online-go.com/api/v1/tournaments/?format=api&ordering=-time_per_move&page=5801",
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            "name": "tournament 13x13.",
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                "summary": "Like to play on a 13 x 13 board?",
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        {
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