List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=-exclusivity&page=5556
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=-exclusivity&page=5555",
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            "description": "リーグ開始時に参加されているメンバーでの総あたり戦になります。(レーティングによる自動ハンデ付き)\n\nIt will be a round-robin tournament with automatic handicapping based on ratings.",
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            "id": 41128,
            "name": "順位戦2(仮)",
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                "username": "who?min",
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            "description": "OGSだと適正な手合でトーナメントは難しいのでとりあえずオール互戦で総当たりにします。 そこから適当に点数決めて出来たらいいな… という訳で段位者とも互戦で打てるチャンスかもね! 最大6人です。 持ち時間は少し短く一手1日最大2日にします。 参加出来るかたよろしくね!\n既に順位戦に参加してるかたは無しでお願いします!",
            "schedule": null,
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