A significant majority (24 out of 28) of gold and silver medalists achieved a perfect score on Problem 1, confirming its low difficulty.
A game-theory problem on a board involving L-shapes. It required determining the minimum number of marked squares needed to ensure a certain outcome. Key Commentary Insights Comentarii JBMO 2015
for positive real numbers. The minimum value was found to be 3. A significant majority (24 out of 28) of
Problem 1 was criticized for being perhaps too simple for an international olympiad, acting more as a "points booster" than a differentiator for top talent. Key Commentary Insights for positive real numbers
A problem involving an acute triangle and perpendicular lines from a midpoint. The goal was to prove an equality between two angles,
The competition consisted of four problems covering algebra, number theory, geometry, and combinatorics.