Skip to content

Registration is open→

Combinatorics
Open

About Competition Problems Results FAQ Team Register

Registration is open

Register for the 2026 Open.

Free and online · November 14–15, 2026. Your confirmation email will contain the access code you need on contest day.

Participant details

We collect only what is needed to run the competition, publish results with your permission, and send your contest access code.

Full name, as it should appear on resultsEmailCountry of your school

⌄

SchoolGrade

⌄

How did you hear about us? Optional

Have a coordinator code? Optional

Open this only if a school coordinator gave you a code.

Coordinator code

I am 13 or older, or a parent or teacher is submitting this for me.I agree to the rules, honor code, and privacy notice.Show my name on the public results page. Uncheck this to appear as “Anonymous, Country.” You can ask us to remove your name later.

Website

Free. Online. Open worldwide.

hello@combinatoricsopen.org

2026 SponsorsPaxeraHealth Qurbit Research Group Hiereia

Competition

About Rules Problems Results

Get involved

Register Coordinators Sponsors

Organization

Team Contact Privacy

© 2026 Combinatorics Open.

InstagramTikTokYouTube@combinatoricsopen