List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=-min_ranking&page=138
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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        {
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                "summary": "Серия турниров \"Четыре Сезона\"",
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        {
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            "name": "bjoern's mini-tournament",
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