List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=-subsequent_pairing_method&page=4347
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
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                "name": "Go7wien",
                "summary": "Wiener Go Klub",
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                "username": "🦁 Lvicala 🦁",
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            "description": "Everybody is welcome",
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                "summary": "for all fighters like lion :)",
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        {
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            "description": "Well, Im back...",
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