In the accompanying diagram, Player B has returned the ball to Player A's wide forehand as hoped for, and now Player A has at least 3 good options to choose from when deciding where to hit the next stroke.
Option 1: Wide Cross Court to Player B's Forehand
This will almost always be a good choice, since in almost all cases Player B will be moving to his left in order to return to the center of all angles that Player A can possibly hit. By hitting the ball wide to Player B's forehand, Player A will force Player B to reverse his momentum and move back to his right. Player A can make things even more difficult by using more of the natural hooking sidespin produced by a forehand loop to curve the ball even further away from Player B.
The further Player B is moving to cover his backhand side, the stronger this option becomes.
Option 2: Down the Line to Player B's Backhand
If Player B doesn't move very much towards his backhand side, he will leave a gap open down the line that Player A can aim at. If Player A can hit this target, he will almost certainly hit a clean winner. Even if Player B is moving quickly to cover this gap, he will be likely to have to hit the ball on while on the move, making it difficult to make a strong shot. He will also find it hard to stop his momentum towards the left, making him vulnerable to Player A hitting the next ball towards Player B's forehand side.
Option 3: Aiming at Player B's Playing Elbow
This will always be a strong option, but the difficulty is judging exactly where Player B's
playing elbow (or crossover point) will be by the time the ball reaches him, since Player B will be on the move. Even so, there are many times when Player B will be expecting Player A to go wide to either side, so a ball aimed more or less down the middle can often catch Player B completely by surprise.