List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=-max_ranking&page=238
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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            "description": "No pausing and no vacations.\n\nBeware that this is fast correspondence :)",
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                "username": "傳碁學園",
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        },
        {
            "id": 69053,
            "name": "The 1st Christmas Competition 🎄🎄🎄",
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                "username": "Karson",
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            "description": "Have some fun Go games on Christmas 🎄🎄🎄!!!",
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                "id": 3852,
                "name": "Hong Kong ",
                "summary": "First priority : HK people join plz                                                                     \nThis group welcomes everyone, but only if you don't be rude.",
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            "description": "Open league for everyone. Tournament will be started as soon as 10 players will join it.\n\nPrevious winners: https://online-go.com/group/12599",
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            "description": "aaaasaas ex",
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