Question 3
The letters of the alphabet must form a chain A, B, C, ... Z in which each letter is a chess-knight move from the previous one. The eight remaining letters C, D, E, M, N, O, P and Z have to be placed in the empty squares of the cross-shaped grid shown. Which letter goes in the empty square at the left end of the bottom row (the row containing R and I)? Answer with a single capital letter (English alphabet A-Z).
