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
A problem involving an acute triangle and perpendicular lines from a midpoint. The goal was to prove an equality between two angles, A significant majority (24 out of 28) of