Tips For Beating A Chopper
1 - Place your attacks at the center of the table. Attack at his elbow / pocket / body. Stay away from both his wings.
2 - Move him close / far to table. Use drop shots when he is very far from table.
3 - Do not put much spin on your shots if you can't handle they when come with reversed spin. If you send heavy topspin you'll receive heavy backspin.
4 - Loop with a high arc with an upward motion. Your primary goal should be keep the ball in play, while looking for a chance to score.
5 - If he's serving with long pips, his serves can't be spiny. Learn to kill them.
6 - He probably can't attack against topspin well, but can attack backspin.
7 - No spin can be hard to handle for some long pips. See if you can make him pop it out.
8 - Try to cover the entire table with you forehand if you are fast enough. Get into ready position as soon as you know where the ball is going.