In a certain code language, 'BRAIN' is coded as 'EIDRQ',

Solution

The logic followed here is as follows: From the left end, alternately replace the letters with the third succeeding letter as per English alphabetical order and the letter having the same place value as the given letter when the letters are written as per reverse English alphabetical order (opposite pairs). For BRAIN: B (+3) = E, R (Reverse) = I, A (+3) = D, I (Reverse) = R, N (+3) = Q For SYSTEM: S (+3) = V, Y (Reverse) = B, S (+3) = V, T (Reverse) = G, E (+3) = H, M (Reverse) = N Similarly, for PLAYER: P (+3) = S, L (Reverse) = O, A (+3) = D, Y (Reverse) = B, E (+3) = H, R (Reverse) = I So, 'PLAYER' is coded as 'SODBHI'.