List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=exclude_provisional&page=5
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=exclude_provisional&page=4",
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                "name": "Cracks Mexicanitos",
                "summary": "En este grupo BTS.chimy tratara de que este sea un grupo muy bueno, haciendo torneos cada 2 semanas esperamos se diviertan =P.",
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