(I can provide the full algebraic verification if needed.)
The AoPS community maintains an extensive wiki and forum specifically for the . You can often find PDF compilations of past papers from the 1960s to the present day, with solutions verified by top-tier math students globally. 3. "The USSR Olympiad Problem Book" russian math olympiad problems and solutions pdf verified
https://imomath.com/othercomp/Rus/RusMO2006-15.pdf (Solutions available separately on the same site) Story: The Verified PDF Problem 2 (10th grade,
This is widely considered the bible of Russian geometry. It starts with basic concepts and escalates to IMO-level difficulty. "The USSR Olympiad Problem Book" Russian MO 2006–2015
We are talking, of course, about the Russian Math Olympiad system.