List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=board_size&page=106
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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    "previous": "https://online-go.com/api/v1/tournaments?format=api&ordering=board_size&page=105",
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                "username": "🐬⚔️🐬 🍩🥂🕯️🌱",
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            "description": "Quick, fun, and challenging.\nGood luck!",
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                "id": 10635,
                "name": "Blitz ⚡",
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            "id": 85198,
            "name": "Live 9x9 Double Elimination Tournament 2022-01-22 18:30",
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            "name": "Live 9x9 Double Elimination Tournament 2020-06-22 06:30",
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                "username": "matburt",
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        {
            "id": 52078,
            "name": "Live 9x9 Double Elimination Tournament 2019-09-16 18:30",
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                },
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            "subsequent_pairing_method": "slaughter",
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                "id": 488500,
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                "max_time": 259200
            },
            "is_open": true,
            "exclude_provisional": true,
            "group": {
                "id": 2946,
                "name": "Final Frontier",
                "summary": "Welcome to Final Frontier.\n\nWe have tons of tournaments and a magnificent director-Picard.\nPlease join this frontier soon, we are closing!",
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            "subsequent_pairing_method": "slaughter",
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            "max_ranking": 10,
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