List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=board_size&page=4108
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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                "name": "Asociația de Go Brăila",
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            "time_start": "2018-11-11T14:00:00Z",
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            "first_pairing_method": "slide",
            "subsequent_pairing_method": "slaughter",
            "min_ranking": 5,
            "max_ranking": 38,
            "analysis_enabled": true,
            "exclusivity": "invite",
            "started": "2018-11-08T18:36:08.278062Z",
            "ended": "2019-01-16T07:24:25.174323Z",
            "start_waiting": "2018-11-08T18:36:03.386193Z",
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            "active_round": null,
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            "player_count": 10,
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