List all tournaments or create a new tournament.

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HTTP 200 OK
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Content-Type: application/json
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                "username": "eaglejoy",
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            "description": "<hr>\n<h2>What makes our matches unique?</h2>\n\n<ol>\n<li>The matches are <strong>true</strong> fast correspondence, —  more than 2 moves per clock day.</li>\n<li>We have a Rank Difference Compensation policy which makes matches close, and lower-kyu players have more opportunities to get a good place.</li>\n<li>We use 'type rank' (such as 9x9 cor. rank) rather than the overall rank.</li>\n</ol>\n\n<hr>\n<h2>Additional rules</h2>\n\n<ol>\n    <li>Pause or Vacation mode is not allowed</li>\n    <li>The participants whose <strong>ratings are far higher/lower than the average ratkings of opponents will get adjusted points</strong>; for instance, 2 kyus higher or lower will be plus or minus 0.5 result points.</li>\n</ol>\n\n<h2>Attention</h2>\n\n<h3>Speed and Time-out</h3>\n\nKeep in mind that the avg speed of one game is about <u>3 moves per calendar day (or 12 hrs of your clock time)</u> per player. Since the Round Robin will activate several games simultaneously, for a match with five players, the avg speed times 4. To respect your opponents and the match organizer, <strong>please try to avoid time out as far as possible.</strong>. \n\nLoss by time out will be labeled as \"disqualified\" on the table by OGS' program automatically.\n\nLoss by time out will affect your reputation in this Match system.\n\n<h2>Tips</h2>\n\n<ul>\n    <li>Use Plan Conditional Moves to speed up</li>\n    <li>To pay more attention to the progress of this tournament (use filter &quot;Game&quot; in Active Games list on the Home page or Profile page, or press &quot;Ctrl+F&quot; to find the key strings &quot;<strong>Mid-</strong>&quot; )</li>\n    <li>Meanwhile, for better quality, no need to play too many moves a day — after all, Mid-Speed Match is not a live game.</li>\n</ul>\n\n<hr />\n\n<h3>Ref</h3>\n\n<ul>\n    <li><a href=\"https://online-go.com/tournament/101569\">Previous tournament</a></li>\n    <li><a href=\"https://online-go.com/group/12936\">About the <strong>Mid-speed</strong> Group</a></li>\n</ul>",
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        {
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            "name": "Handicap Arena 2025 - 090",
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                "username": "Gia",
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            "description": "Part of an arena tournament. For details, rules and arena-standings see the group page.\n\nThe tournament will start as soon as there are 5 players.",
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            "description": "A tournament between friendly peers (or everyone on my friend list that has played a close game recently)",
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