Select from options: Continue writing the next sentence.

How to bowl the doosra
Hold the ball like a fast bowler.
Position your index and middle fingers on either side of the seam. For better ball control, your index finger should just about touch the seam.

OPT: -For best ball control, place the palm of your hand over the seam so your knuckles are facing forward. Press down on the seam with your palm and keep the ball where it is, just above the seam. -Your thumb may rest on the ball, but this usually doesn't affect delivery. Use your remaining two fingers to hold the ball in place. -The first step is to make contact with the ball at a forty-five degree angle. If you press down on the ball too hard or not aim to, you may create a ring around the seam, ruining your motion. -Since the doosra is sometimes folded at the seam, you want to throw it well out of the way. Hold the ball back or toward your other hand.
Answer:
Your thumb may rest on the ball, but this usually doesn't affect delivery. Use your remaining two fingers to hold the ball in place.