Huge Title
American Computer Science League (ACSL)
"ONE of the Oldest Computer Science Challenge with 49th years of History"
organizes computer programming and computer science contests for K-12 schools, organizations and local groups. This year will be our 49th year of continuous operation! Last year, over 7,000 students from 21 countries on 6 continents participated in the regular season competitions.
ACSL Thailand 2026-2027:
"Your Fast Track to the American Computer Science League Global Finals"
Overview Phi Connections, the authorized partner of the American Computer Science League (ACSL) in Thailand, invites students to join the 2025-2026 Season. This is a special "Pilot Launch" designed to fast-track Thai students directly into the global ranking system. Participate in standard contests, earn an official US transcript for your university portfolio, and compete for a spot at the All-Star Global Finals.
1. Why Join Now?
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Official US Transcript: Receive a verified score report from ACSL America to boost your college applications.
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Global Benchmarking: Measure your coding skills against students from the US, China, and Europe.
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Finals Qualification: High-scoring students will be invited to the Online All-Star Finals on May 24, 2026.
2. Competition Divisions
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Senior Division: Grades 10-12 (Experienced)
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Intermediate Division: Grades 7-9 (Advanced) or HS beginners
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Junior Division: Grades 6-9 (Beginners)
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Classroom Division: Open to all grades (Non-programming focus)
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Elementary Division: Grades 3-6 (Logic & Critical Thinking)
3. Team Structure: The "Top 3" Strategy We utilize the US Standard 3-Score System to maximize your chances:
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Roster: A team can have up to 5 students.
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Scoring: The "Team Score" is calculated from the sum of the top 3 scores in each contest.
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Advantage: This format provides a safety net. If a member misses a contest or scores lower, it won't hurt the team's ranking.
Elementary
Division
Open to students in grades 3 - 6.
Each contest consists of an online 30-minute, 6-question non-programming test, focused on a single category of content. A different category will be tested on each contest.
Junior
Division
Best for junior high and middle school students who are learning programming or who have coding experience. No student beyond grade 9 may compete in the Junior Division.
Each contest consists of an online 30-minute, 6-question short answer test and an online programming problem to solve in 72 hours.
Intermediate
Divison
Best for high school students with little or no programming experience and for advanced junior high students.
Each contest consists of an online 30-minute, 6-question short answer test and an online programming problem to solve in 72 hours.
Senior
Division
Best for high school students with programming experience, especially those taking AP Computer Science.
Each contest consists of an online 30-minute, 6-question short answer test and an online programming problem to solve in 72 hours.
Classroom
Division
Open to students in all grades. Ideally suited for students taking AP Computer Science Principles, and other computer science classes without a major programming component.
Each contest consists of an online 50-minute, 10-question short answer test. The problems are non-programming problems from the Junior, Intermediate, and Senior divisions.
4. Registration Options & Fees
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Pre-formed Team, MODE: ONLINE
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Form your own group of 3-5 friends.
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Best for strategy and teamwork.
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Fee : Elementary Division THB 7,500 / Team, Other Division THB 7,500 / Team
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5. Competition Timeline (Fast Track)
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Registration Closes:
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Elementary and Classroom Division - December 25th, 2026
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Junior, Intermediate, and Senior Divisions - December 25th, 2026
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Regular Season (4 Rounds): October 2026 – April 2027
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Contest #1: available Oct. 20, 2026 to Jan 3, 2027
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Contest #2: available Jan. 10, 2027 to Feb 21, 2027
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Contest #3: available Feb. 28, 2027 to April 4, 2027
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Contest #4: available April 11, 2027 to May 16, 2027
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Invitations E-mailed: May 1, 2027 through May 28, 2027
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Invitational Finals: Saturday, May 29, 2027 (Memorial Day weekend in the United States)
6. Awards & Recognition For this 2026-2027 season, the focus is on International Accreditation:
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Official ACSL Certificates: At the conclusion of the regular season, ACSL will send a certificate to the top scoring students in each division in each country, and to the top scoring teams in each division in each country.
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For the ACSL Finals, the top scoring students in each division will get a prize and a certificate. The certificates will be mailed to the team for distribution to students; the prize will be sent directly to the student.
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Global Leaderboard: Top performers listed on the official ACSL.org website.
The topics that are covered in ACSL Round 1-4
Each Topics linked to the page of the ACSL Wiki
A great set of 21 YouTube video lessons covering the ACSL topics
Student Guideline: PDF