List all tournaments or create a new tournament.

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HTTP 200 OK
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Content-Type: application/json
Vary: Accept

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            "title": null,
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                "time_control": "byoyomi",
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            "exclude_provisional": false,
            "group": {
                "id": 6424,
                "name": "CLASIFICATORIO FEMENINO- CONGRESO  LATINOAMERICANO 2022",
                "summary": "Bienvenidas al Clasificatorio femenino rumbo al 4.º Quzhou Lanke Congreso Latino­americano de Go 2022",
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}