About

The official US Chess tournament listing only shows events whose organizers paid for a TLA — for Massachusetts that's often fewer than ten events, while local clubs run rated tournaments every week. This site aggregates the actual club calendars (Boylston, MetroWest, and more) plus the official TLA listing into one place, updated twice weekly. It's aPatternChess project.

For club organizers

Our crawler identifies itself as ChessEventsBot/1.0 (+https://events.patternchess.com/about), respects robots.txt, waits at least 2 seconds between requests to your site, and visits about twice a week. If you'd like your club added, corrected, or removed, emailelliotmharris@gmail.com.

JSON API

Free, no key required, CORS enabled. Data is CC-BY-style: use it, credit "PatternChess Events".

GET /api/events                 # upcoming events
GET /api/events?club=boylston&rating=regular&from=2026-09-01&to=2026-09-30
GET /api/events/:id
GET /api/clubs

Responses are wrapped as {"data": …, "meta": {"count": n}}.

iCal feeds

Subscribe in Apple/Google Calendar; feeds refresh automatically.

/ical/all-ma.ics        # everything
/ical/<club-slug>.ics   # one club (e.g. /ical/boylston.ics)

Coverage & caveats

• Massachusetts only for now.
• Fields like time control, sections, and fees are parsed from club pages — always confirm with the linked source page before traveling.
• Events that disappear from a club calendar before their date are kept but hidden (soft-deleted), so links stay stable.