List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=-max_ranking&page=5645
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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            "description": "欢迎加入 https://online-go.com/group/13797  ^_^\n     本届改为瑞士制\n     每手棋14天\n     祝你愉快!",
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