PREVIOUS PROBLEMS
- 58th IChO Tashkent, Uzbekistan
- 57th IChO Dubai, United Arab Emirates
- 56th IChO Riyadh, Saudi Arabia
- 55th IChO Zurich, Switzerland
- 54th IChO Nankai District, Tianjin, P.R. China (Remote Access Exam)
- 53rd IChO Osaka, Japan (Remote Access Exam)
- 52nd IChO Istanbul, Turkey (Remote Access Exam)
- 51st IChO Paris, France
- 50th IChO Bratislava and Prague, Slovakia and Czech
- 49th IChO
- 48th IChO
- 46th-50th IChO
- 41st-45th IChO
- 21st-40th IChO
- 1st-20th IChO
PREVIOUS PREPARATORY PROBLEMS
- 58th IChO Tashkent, Uzbekistan
- 57th IChO Dubai, United Arab Emirates
- 56th IChO Riyadh, Saudi Arabia
- 55th IChO Zurich, Switzerland
- 54th IChO Nankai District, Tianjin, P.R. China (Remote Access Exam)
- 53rd IChO Osaka, Japan (Remote Access Exam)
- 52nd IChO Istanbul, Turkey (Remote Access Exam)
- 51st IChO Paris, France
- 50th IChO Bratislava and Prague, Slovakia and Czech
- 49th IChO Nakhon Pathom, Thailand
- 48th IChO Tbilisi, Georgia
- 47th IChO Baku, Azerbaijan
- 46th IChO Hanoi, Vietnam
- 45th IChO Moscow, Russian Federation
- 44th IChO Washington, USA
- 43rd IChO Ankara, Türkiye
- 42nd IChO Tokyo, Japan
- 41st IChO Cambridge, United Kingdom
- 40th IChO Budapest, Hungary
- 39th IChO Moscow, Russian Federation
- 38th IChO Republic of, Gyeongsan, Korea
- 37th IChO Taipei, Taiwan
- 36th IChO Kiel, Germany
- 35th IChO Athens, Greece
- 34th IChO Groningen, Netherlands
- 33rd IChO Mumbai, India