Iranian Combinatorics Olympiad 2026 Exam Date, Schedule, Eligibility and Details

The Iranian Combinatorics Olympiad 2026 exam date has been announced for both rounds of the international mathematics competition. The 6th edition of the Iranian Combinatorics Olympiad (ICO) will be conducted online and is open to participants from different countries. It focuses on combinatorics, mathematical reasoning and creative problem-solving. 

The competition allows participants to form teams of up to three members from the same country. It includes four levels — Junior, Intermediate, Advanced and Open — providing opportunities for students with different levels of mathematical experience.

Also check, Iranian Combinatorics Olympiad 2026 Registration

Iranian Combinatorics Olympiad 2026 Exam Date

The Iranian Combinatorics Olympiad 2026 will take place in two rounds, with a one-week gap between them. The First Round will be conducted on November 20, 2026, and the Second Round will take place on November 27, 2026:

Iranian Combinatorics Olympiad 2026 Exam Schedule

The competition follows a two-round structure. The First Round is a short-answer examination, while the Second Round focuses on long-answer and proof-based problems.

• First Round: November 20, 2026, from 2:00 PM to 4:00 PM (Iran Time). Participants across all four levels will take part in this round.

• Second Round: November 27, 2026, from 2:00 PM to 7:00 PM (Iran Time). Qualifying teams from the Advanced and Open levels will participate in this round.

The Second Round is designed to assess participants' mathematical reasoning and ability to present detailed solutions.

Also check, Unified International Mathematics Olympiad (UIMO)

Iranian Combinatorics Olympiad 2026 Levels

ICO 2026 offers four competition levels based on participants' educational stages and experience.

Participants should check the official competition rules to confirm the appropriate level before registering.

Check, STEM Olympiad Syllabus

Iranian Combinatorics Olympiad 2026 Eligibility and Team Rules

The competition is open to participants worldwide who are interested in mathematics and combinatorics. Teams can include one, two or three members. All members of a team must have the same nationality.

The competition is conducted entirely online in 2026. Participants can select one of the four available levels according to the eligibility requirements.

Also check, CREST Olympiad Exam Date

Iranian Combinatorics Olympiad 2026 Registration

Registration for ICO 2026 is completed online through the official competition platform. Each team member must create an individual account before the team leader registers the team.

The registration process includes the following steps:

1. Each participant creates an individual account on the official ICO website.

2. The team leader opens the competition registration page and registers the team.

3. The team leader enters the details of all team members.

4. Other team members log in to their accounts and accept the team invitation from their profiles.

The announced registration deadline is November 9, 2026. Participants should complete the process before the deadline.

Iranian Combinatorics Olympiad 2026 Second Round Qualification

The Second Round is available to qualifying teams in the Advanced and Open levels. According to the competition announcement, the top 30 Advanced teams and top 20 Open teams automatically qualify.

Additional qualification opportunities are provided to improve country representation. The highest-ranked team from a country not already represented among the automatic qualifiers enters a separate pool. The five highest-ranked teams from this pool also qualify for the Second Round.

Important Rules for ICO 2026

Participants should understand the competition guidelines before taking the examination.

• The competition will be conducted online, with no offline division.

• Simple calculators are permitted.

• Reference materials and online searches may be used only to understand terminology or clarify language in a problem statement.

• Using artificial intelligence tools to generate ideas, perform calculations or construct proofs is prohibited.

• Teams must follow the official instructions for their selected competition level.

The Iranian Combinatorics Olympiad 2026 will begin with the First Round on November 20, followed by the Second Round on November 27. The international online competition offers four levels and allows teams of up to three members. Interested participants should review the eligibility conditions, complete registration and check the official website for announcements and competition instructions.