List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=-first_pairing_method&page=4511
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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                "time_control": "fischer",
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            "is_open": true,
            "exclude_provisional": true,
            "group": null,
            "auto_start_on_max": false,
            "time_start": "2025-05-21T19:00:29.787277Z",
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            "subsequent_pairing_method": "slaughter",
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        },
        {
            "id": 77244,
            "name": "Correspondence 13x13 RoundRobin 2021-07-09 19:00",
            "director": {
                "id": 4,
                "username": "matburt",
                "country": "us",
                "icon": "https://secure.gravatar.com/avatar/1dff84686f829e8ef90e2e123f1baddf?s=64&d=retro",
                "ratings": {
                    "version": 5,
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                        "rating": 1125.8827017028436,
                        "deviation": 78.19731452501959,
                        "volatility": 0.06006087171771568
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                },
                "ranking": 17.66169912212786,
                "professional": false,
                "ui_class": "supporter moderator admin"
            },
            "description": "Automatic Sitewide Tournament",
            "schedule": {
                "id": 7,
                "name": "Correspondence 13x13 RoundRobin",
                "rrule": "DTSTART:20260401T190000Z\nRRULE:FREQ=DAILY;INTERVAL=3",
                "active": true,
                "created": "2015-02-20T06:00:14.582400Z",
                "last_run": "2026-04-01T19:00:13.781457Z",
                "lead_time_seconds": 86400,
                "tournament_type": "roundrobin",
                "handicap": 0,
                "rules": "japanese",
                "size": 13,
                "time_control_parameters": {
                    "time_control": "fischer",
                    "initial_time": 259200,
                    "pause_on_weekends": true,
                    "max_time": 259200,
                    "time_increment": 86400
                },
                "min_ranking": 0,
                "max_ranking": 36,
                "analysis_enabled": true,
                "exclude_provisional": true,
                "players_start": 4,
                "first_pairing_method": "slaughter",
                "subsequent_pairing_method": "slaughter",
                "settings": {
                    "num_rounds": "3",
                    "upper_bar": "20",
                    "lower_bar": "10",
                    "group_size": "3",
                    "maximum_players": 10
                },
                "next_run": "2026-04-04T19:00:00Z",
                "base_points": "10.0"
            },
            "title": null,
            "tournament_type": "roundrobin",
            "handicap": 0,
            "rules": "japanese",
            "time_per_move": 89280,
            "time_control_parameters": {
                "time_control": "fischer",
                "initial_time": 259200,
                "pause_on_weekends": true,
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                "time_increment": 86400
            },
            "is_open": true,
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            "auto_start_on_max": false,
            "time_start": "2021-07-09T19:00:38.008445Z",
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            "first_pairing_method": "slaughter",
            "subsequent_pairing_method": "slaughter",
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            "analysis_enabled": true,
            "exclusivity": "open",
            "started": "2021-07-09T19:00:39.612132Z",
            "ended": "2021-09-08T05:29:20.697356Z",
            "start_waiting": "2021-07-09T19:00:38.444360Z",
            "board_size": 13,
            "active_round": null,
            "icon": "https://cdn.online-go.com/5.1/img/trophies/gold_title_13.png",
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        {
            "id": 9608,
            "name": "Sunjang Baduk Tournament 4th Season (Group B1)",
            "director": {
                "id": 32917,
                "username": "yazphier",
                "country": "se",
                "icon": "https://user-uploads.online-go.com/9f80d481834c8552fab161e6de0e3279-64.png",
                "ratings": {
                    "version": 5,
                    "overall": {
                        "rating": 1413.5147433528527,
                        "deviation": 65.7398081525858,
                        "volatility": 0.059983920583566386
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                "ranking": 22.928601383861135,
                "professional": false,
                "ui_class": ""
            },
            "description": "## <i class=\"fontnova-turtle\"></i> Correspondence Sunjang Baduk Tournament\n### Season 4 - Group B1\n\n###**Read the description below.** \n- ####You have **7 days** to join your round-robin after receiving the invitation\n- ####<font color=\"red\">**SPECIAL OPENING RULES:**</font> ([See description][Correspondence Tournament])\n\n&ensp;&ensp; ![Opening Rule][sunjang opening]\n___ \n###  **Title Holder:** <font color=\"gold\">**🏆**</font> [illluck] <font color=\"gold\">**🏆**</font> \n\n<table border='2'>\n  <tr>\n    <th colspan=\"9\"><i class=\"fontnova-turtle\"></i> [Correspondence \nTournament]</th>\n  </tr>\n  <tr>\n    <th width=\"70\" rowspan=\"3\">Season</td>\n    <th width=\"90\" rowspan=\"3\"><font \ncolor=\"Gold\">Champion<br>🏆</font></td>\n    <th width=\"90\" rowspan=\"3\"><font \ncolor=\"silver\">Runner-up<br>🏆</font></td>\n    <th width=\"90\" rowspan=\"3\"><font color=#CD7F32> 3rd \nPlace<br>🏆</font></td>\n    <th colspan=\"5\">Groups / Rounds</td>\n  </tr>\n  <tr>\n    <th width=\"45\" rowspan=\"2\">*Final*</td>\n    <th colspan=\"4\">Divisions</td>\n  </tr>\n  <tr>\n    <th width=\"60\" colspan=\"2\">*A*</td>\n    <th width=\"30\">*B*</td>\n    <th width=\"30\">*C*</td>\n  </tr>\n  <tr>\n    <td>2011</td>\n    <td>[vitality]</td>\n    <td>[Uberdude]</td>\n    <td>[illluck]</td>\n    <td>-</td>\n    <td>[A](https://online-go.com/tournament/1533)</td>\n    <td>-</td>\n    <td>[B](https://online-go.com/tournament/1532)</td>\n    <td>-</td>\n  </tr>\n  <tr>\n    <td>2012</td>\n    <td>[illluck]</td>\n    <td>[fengitreon]</td>\n    <td>[MatCauthon]</td>\n    <td>-</td>\n    <td>[A](https://online-go.com/tournament/1975)</td>\n    <td>-</td>\n    <td>[B](https://online-go.com/tournament/1976)</td>\n    <td>-</td>\n  </tr>\n  <tr>\n    <td>2013-14</td>\n    <td>[illluck]</td>\n    <td>[ZyBeX86]</td>\n    <td>[kavias]</td>\n    <td>[🏆](https://online-go.com/tournament/2984)</td>\n    <td>[A1](https://online-go.com/tournament/2709)</td>\n    <td>[A2](https://online-go.com/tournament/2711)</td>\n    <td>[B](https://online-go.com/tournament/2712)</td>\n    <td>[C](https://online-go.com/tournament/2713)</td>\n  </tr>\n</table>\n___\n###**Format:** League\n\n###The Divisions:\n- Hierarchical structure, labeled ***A***, ***B***, ***C***, \n***D***, etc.\n- Assorted in groups. Top division has two (**A1**, **A2**)\n- Players of similar strength\n\n###The Groups:\n- 5 to 9 players (ideally 7)\n- Seeded by strength (<i class=\"fa\">&#xf10c;</i> overall rank) \n- Compete in a *Simultaneous Round-robin*\n\n###The Final Round: 3 players\n- Qualify: the winners of **A1** and **A2**, and the *Title \nHolder*.\n- Merit based tie-break (good title defense, good performance in \nprevious round)\n- A third player<sup>1</sup> may be drawn if needed\n\n### The games:\n- Fischer Timing, 3 days on the initial timer and 1 day increment \nper move (capped at 7 days). No weekend stop\n- No handicap, 6.5 komi. **Sunjang Baduk** starting position\n- Korean rules\n- **Conditional moves** enabled\n\n###Promotions & Demotions:\n- Best player<sup>1</sup> per Group promotes one division up\n- Worst 3 players<sup>1</sup> per Division demote one division down\n- Dropped and disqualified players reapply as new players\n- Promotions based on rank may be awarded to fill available space \n(both new and old players apply, even if demoted).\n___\n\n####Notes\n<sup>1</sup>Best and worst players are determined first by Scored \nPoints, then the Sum of defeated opponent's scores (SODOS) and \nlastly by <i class=\"fa\">&#xf10c;</i> overall rank.\n\nFor more details you may visit the [Sensei's pages][Correspondence \nTournament].\n\n[fengitreon]: https://online-go.com/user/view/11442/fengitreon\n[illluck]: https://online-go.com/user/view/8913/illluck\n[kavias]: https://online-go.com/user/view/4048\n[MatCauthon]: https://online-go.com/user/view/5832/MatCauthon\n[vitality]: https://online-go.com/user/view/35184/vitality\n[Uberdude]: https://online-go.com/user/view/8592/Uberdude\n[ZyBeX86]: https://online-go.com/user/view/52701\n\n[group]: https://online-go.com/group/142\n[sunjang opening]: http://i.imgur.com/vdZ0oLB.png?1\n[Correspondence Tournament]: http://senseis.xmp.net/?SunjangBadukTournamentAtOGS",
            "schedule": null,
            "title": null,
            "tournament_type": "roundrobin",
            "handicap": 0,
            "rules": "korean",
            "time_per_move": 89280,
            "time_control_parameters": {
                "time_control": "fischer",
                "initial_time": 259200,
                "max_time": 604800,
                "time_increment": 86400
            },
            "is_open": true,
            "exclude_provisional": false,
            "group": {
                "id": 142,
                "name": "Sunjang Baduk - 순장바둑",
                "summary": "For those who would like to play Sunjang Baduk, a form of Go which was popular in Korea (Joseon) through the 16th century.",
                "require_invitation": false,
                "is_public": true,
                "admin_only_tournaments": false,
                "hide_details": false,
                "member_count": 197,
                "icon": "https://user-uploads.online-go.com/884a0fb3009f38ec8dffd08d3cc84cee-64.png"
            },
            "auto_start_on_max": true,
            "time_start": "2015-08-10T10:01:00Z",
            "players_start": 4,
            "first_pairing_method": "slaughter",
            "subsequent_pairing_method": "slaughter",
            "min_ranking": 0,
            "max_ranking": 36,
            "analysis_enabled": true,
            "exclusivity": "invite",
            "started": "2015-08-10T10:01:19.889178Z",
            "ended": "2015-12-13T04:53:17.226034Z",
            "start_waiting": "2015-08-10T10:01:19.661973Z",
            "board_size": 19,
            "active_round": null,
            "icon": "https://user-uploads.online-go.com/884a0fb3009f38ec8dffd08d3cc84cee-15.png",
            "player_count": 5,
            "ranked": true
        }
    ]
}