A: All Chess Tactics exercises were generated using a powerful chess engine, so all solution moves are guaranteed to be the best possible and by a wide margin (the second best move and its score is shown when reviewing the solution on the right side of the page).
Please note that the goal of Chess Tactics is to gain maximum advantage in the shortest possible number of moves. You are likely overlooking something, that makes your solution not as quick, or it does not increase the material advantage as much, or both. Keep analyzing, and you will surely find the overlooked move.
