IChO 2018 preparatory problems
Theoretical preparatory problems – updated 1st June 2018 PDF
Solutions to the theoretical preparatory problems – updated 12th June 2018 PDF
Practical preparatory problems – updated 1st June 2018 PDF
Solutions to the practical preparatory problems – updated 1st June 2018 PDF
Corrections to the first version of the preparatory problems (distributed to head mentors and published on 1st February 2018) – updated 1st June 2018 PDF
Corrections to the first version of the solutions (distributed to head mentors on 1st February 2018) – updated 12th June 2018 PDF
IChO Syllabus can be found in the Regulations (Appendices C and D) PDF
We welcome any comments, corrections and questions about the problems via email at info@50icho.eu.