List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=-auto_start_on_max&page=345
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
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            "description": "Join the group for more cat tournaments ^__^",
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            "name": "9x9 Open D.E. Cup #89",
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            "description": "Double-Elimination tournament for everyone. It will be started as soon as 8 players will join it.\n\nPrevious winners: https://online-go.com/group/10842",
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                "summary": "A group for Go players who love the 9x9 board.",
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                "username": "樂 碁",
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            "name": "9x9 Lovers and Chat Lovers Tournament",
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        {
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            "name": "Tournament 🔟",
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                "username": "royz",
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