List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=-players_start&page=5479
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=-players_start&page=5478",
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                "username": "AYAMI.S",
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            "description": "居芷琪錢尚鋒",
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        },
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            "id": 16002,
            "name": "Tournoi LFG - 9x9 #1",
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                "username": "Pandraghon",
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            },
            "description": "Premier tournoi en 9x9 du groupe LFG.",
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                "name": "Looking For Go",
                "summary": "Groupe de Go pour la communauté de Looking For Games",
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                "username": "傳碁學園",
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            },
            "description": "Everyone is welcome. It is capped at 10 players. An identical tournament that starts after two weeks or at 10 players will be created as soon as this tournament starts.\n\nPauses are not allowed.",
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        {
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