List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=-player_count&page=5271
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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                "require_invitation": false,
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            "time_start": "2020-04-07T18:30:00Z",
            "players_start": 2,
            "first_pairing_method": "slide",
            "subsequent_pairing_method": "slaughter",
            "min_ranking": 5,
            "max_ranking": 38,
            "analysis_enabled": true,
            "exclusivity": "open",
            "started": "2020-04-07T18:30:10.987079Z",
            "ended": "2020-04-07T18:36:37.726555Z",
            "start_waiting": "2020-04-07T18:30:10.651369Z",
            "board_size": 9,
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            "player_count": 2,
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