Comentarii Jbmo 2015 May 2026

. Notes indicate that many participants were able to solve this using analytical or vector methods.

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. Comentarii JBMO 2015

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 A game-theory problem on a board involving L-shapes

for positive real numbers. The minimum value was found to be 3. The minimum value was found to be 3

A problem involving an acute triangle and perpendicular lines from a midpoint. The goal was to prove an equality between two angles,

. Commentary suggests this was a very accessible problem, possibly even at a 5th or 6th-grade level, which resulted in a high number of maximum scores.