{
  "contest": {
    "id": "erau-es-open",
    "name": "ES Open HF Championship",
    "sponsor": "ERAU",
    "sponsor_home": "https://www.erau.ee/",
    "country": "EE",
    "summary": "Estonia's four-hour spring championship on 80m and 40m at once. Estonian stations work the world; everyone else works Estonia.",
    "modes": [
      "CW",
      "SSB"
    ],
    "bands": [
      "80m",
      "40m"
    ],
    "exchange": "RS(T) and a continuous serial number from 001.",
    "power_categories": [
      {
        "name": "Low Power",
        "max_watts": 100
      },
      {
        "name": "QRP",
        "max_watts": 10
      }
    ],
    "log_format": "Cabrillo",
    "log_deadline_days": 7,
    "log_submit_url": "http://esopen.erau.ee",
    "timezone": "",
    "local_rolling": false,
    "eligibility": {
      "scope": "worldwide",
      "verified": true,
      "note": "'ESTONIAN STATIONS CAN WORK ALL THE STATIONS WHO PARTICIPATE ... NON-ES STATIONS CAN WORK ONLY ES STATIONS.' Anyone may enter; what differs is who counts. ERAU also states that contacts with Russian and Belarusian stations score nothing, citing the war in Ukraine."
    },
    "active_from": null,
    "active_until": null,
    "note": "The third Saturday of April 2026 is the 18th, which is the date the rules print and the date ERAU's own 2026 calendar carries. Everyone may enter, but only ES stations can work everyone; that asymmetry is recorded in the eligibility note rather than as two_sided, because two_sided would tell a station in an unlisted entity it cannot enter, which is false here.",
    "verified": true,
    "rules_url": "https://erau.ee/images/LL/ES-Open_rules.pdf",
    "rules_url_pattern": "",
    "rules_url_archived": "",
    "rules_url_checked": "2026-08-19",
    "source_note": "erau.ee ES Open HF Championship rules (PDF). 'TIME: 3rd SATURDAY in APRIL: 18. APRIL 2026 05.00 - 08.59 UTC'. 'BANDS: 80 M AND 40 M SIMULTANEOUSLY' -- CW 3510-3560 and 7010-7040, SSB 3600-3650, 3700-3750 and 7060-7100, 7130-7175 kHz. 'ESTONIAN STATIONS CAN WORK ALL THE STATIONS WHO PARTICIPATE ... NON-ES STATIONS CAN WORK ONLY ES STATIONS.' 'NB! Due to the ongoing war in the Ukraine QSO-s with stations from Russia and Byelorussia are not counted in this contest and will not give any points.' Exchange: RS(T) and a continuous serial from 001. CW contacts score 2 points and SSB 1. Categories: LP up to 100 W, QRP up to 10 W. 'DEADLINE: LOGS ... SHOULD BE SENT NOT LATER THAN 7 DAYS AFTER THE CONTEST'. Second source, published separately by ERAU: its 2026 calendar prints a row 'ES Open HF Championship / 05:00-08:59 / CW,SSB' on 18.04."
  },
  "rule": {
    "plain": "Third Saturday of April",
    "raw": {
      "type": "nth_weekday",
      "month": 4,
      "n": 3,
      "weekday": 5
    },
    "start": {
      "day_offset": 0,
      "time": "0500"
    },
    "end": {
      "day_offset": 0,
      "time": "0859"
    },
    "sessions": null
  },
  "next": [
    {
      "contest_id": "erau-es-open",
      "name": "ES Open HF Championship",
      "start": "2027-04-17T05:00:00Z",
      "end": "2027-04-17T08:59:00Z",
      "start_wall": null,
      "end_wall": null,
      "local_rolling": false,
      "timezone": "",
      "duration_hours": 3.98,
      "modes": [
        "CW",
        "SSB"
      ],
      "submodes": [],
      "bands": [
        "80m",
        "40m"
      ],
      "bands_note": "CW 3510-3560 and 7010-7040 kHz; SSB 3600-3650, 3700-3750 and 7060-7100, 7130-7175 kHz.",
      "sponsor": "ERAU",
      "rules_url": "https://erau.ee/images/LL/ES-Open_rules.pdf",
      "verified": true,
      "note": "The third Saturday of April 2026 is the 18th, which is the date the rules print and the date ERAU's own 2026 calendar carries. Everyone may enter, but only ES stations can work everyone; that asymmetry is recorded in the eligibility note rather than as two_sided, because two_sided would tell a station in an unlisted entity it cannot enter, which is false here.",
      "exchange": "RS(T) and a continuous serial number from 001.",
      "country": "EE",
      "rules_url_archived": "",
      "rules_url_checked": "2026-08-19",
      "can_enter": true,
      "eligibility_scope": "worldwide",
      "eligibility_reason": "",
      "works": "everyone",
      "practical": "",
      "log_due": "2027-04-24T08:59:00Z",
      "uid": "erau-es-open-20270417T0500@contestcal",
      "start_date": "2027-04-17",
      "mode_families": [
        "CW",
        "SSB"
      ],
      "band_families": [
        "80m",
        "40m"
      ],
      "duration_bucket": "2-12"
    },
    {
      "contest_id": "erau-es-open",
      "name": "ES Open HF Championship",
      "start": "2028-04-15T05:00:00Z",
      "end": "2028-04-15T08:59:00Z",
      "start_wall": null,
      "end_wall": null,
      "local_rolling": false,
      "timezone": "",
      "duration_hours": 3.98,
      "modes": [
        "CW",
        "SSB"
      ],
      "submodes": [],
      "bands": [
        "80m",
        "40m"
      ],
      "bands_note": "CW 3510-3560 and 7010-7040 kHz; SSB 3600-3650, 3700-3750 and 7060-7100, 7130-7175 kHz.",
      "sponsor": "ERAU",
      "rules_url": "https://erau.ee/images/LL/ES-Open_rules.pdf",
      "verified": true,
      "note": "The third Saturday of April 2026 is the 18th, which is the date the rules print and the date ERAU's own 2026 calendar carries. Everyone may enter, but only ES stations can work everyone; that asymmetry is recorded in the eligibility note rather than as two_sided, because two_sided would tell a station in an unlisted entity it cannot enter, which is false here.",
      "exchange": "RS(T) and a continuous serial number from 001.",
      "country": "EE",
      "rules_url_archived": "",
      "rules_url_checked": "2026-08-19",
      "can_enter": true,
      "eligibility_scope": "worldwide",
      "eligibility_reason": "",
      "works": "everyone",
      "practical": "",
      "log_due": "2028-04-22T08:59:00Z",
      "uid": "erau-es-open-20280415T0500@contestcal",
      "start_date": "2028-04-15",
      "mode_families": [
        "CW",
        "SSB"
      ],
      "band_families": [
        "80m",
        "40m"
      ],
      "duration_bucket": "2-12"
    },
    {
      "contest_id": "erau-es-open",
      "name": "ES Open HF Championship",
      "start": "2029-04-21T05:00:00Z",
      "end": "2029-04-21T08:59:00Z",
      "start_wall": null,
      "end_wall": null,
      "local_rolling": false,
      "timezone": "",
      "duration_hours": 3.98,
      "modes": [
        "CW",
        "SSB"
      ],
      "submodes": [],
      "bands": [
        "80m",
        "40m"
      ],
      "bands_note": "CW 3510-3560 and 7010-7040 kHz; SSB 3600-3650, 3700-3750 and 7060-7100, 7130-7175 kHz.",
      "sponsor": "ERAU",
      "rules_url": "https://erau.ee/images/LL/ES-Open_rules.pdf",
      "verified": true,
      "note": "The third Saturday of April 2026 is the 18th, which is the date the rules print and the date ERAU's own 2026 calendar carries. Everyone may enter, but only ES stations can work everyone; that asymmetry is recorded in the eligibility note rather than as two_sided, because two_sided would tell a station in an unlisted entity it cannot enter, which is false here.",
      "exchange": "RS(T) and a continuous serial number from 001.",
      "country": "EE",
      "rules_url_archived": "",
      "rules_url_checked": "2026-08-19",
      "can_enter": true,
      "eligibility_scope": "worldwide",
      "eligibility_reason": "",
      "works": "everyone",
      "practical": "",
      "log_due": "2029-04-28T08:59:00Z",
      "uid": "erau-es-open-20290421T0500@contestcal",
      "start_date": "2029-04-21",
      "mode_families": [
        "CW",
        "SSB"
      ],
      "band_families": [
        "80m",
        "40m"
      ],
      "duration_bucket": "2-12"
    },
    {
      "contest_id": "erau-es-open",
      "name": "ES Open HF Championship",
      "start": "2030-04-20T05:00:00Z",
      "end": "2030-04-20T08:59:00Z",
      "start_wall": null,
      "end_wall": null,
      "local_rolling": false,
      "timezone": "",
      "duration_hours": 3.98,
      "modes": [
        "CW",
        "SSB"
      ],
      "submodes": [],
      "bands": [
        "80m",
        "40m"
      ],
      "bands_note": "CW 3510-3560 and 7010-7040 kHz; SSB 3600-3650, 3700-3750 and 7060-7100, 7130-7175 kHz.",
      "sponsor": "ERAU",
      "rules_url": "https://erau.ee/images/LL/ES-Open_rules.pdf",
      "verified": true,
      "note": "The third Saturday of April 2026 is the 18th, which is the date the rules print and the date ERAU's own 2026 calendar carries. Everyone may enter, but only ES stations can work everyone; that asymmetry is recorded in the eligibility note rather than as two_sided, because two_sided would tell a station in an unlisted entity it cannot enter, which is false here.",
      "exchange": "RS(T) and a continuous serial number from 001.",
      "country": "EE",
      "rules_url_archived": "",
      "rules_url_checked": "2026-08-19",
      "can_enter": true,
      "eligibility_scope": "worldwide",
      "eligibility_reason": "",
      "works": "everyone",
      "practical": "",
      "log_due": "2030-04-27T08:59:00Z",
      "uid": "erau-es-open-20300420T0500@contestcal",
      "start_date": "2030-04-20",
      "mode_families": [
        "CW",
        "SSB"
      ],
      "band_families": [
        "80m",
        "40m"
      ],
      "duration_bucket": "2-12"
    }
  ]
}