For further analysis, you can explore the full JBMO 2015 solutions and commentaries provided by the Viitori Olimpici platform. JBMO 2015 Problems and Solutions | PDF | Mathematics
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. For further analysis, you can explore the full