List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=-players_start&page=299
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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                "summary": "Группа для любителей поиграть в своё удовольствие. (Group for fans to play for fun).",
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            "first_pairing_method": "strength",
            "subsequent_pairing_method": "strength",
            "min_ranking": 5,
            "max_ranking": 36,
            "analysis_enabled": true,
            "exclusivity": "open",
            "started": "2014-10-12T19:34:37.364492Z",
            "ended": "2014-12-07T10:00:45.139549Z",
            "start_waiting": "2014-10-12T19:34:37.007919Z",
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            "player_count": 0,
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}