Mushtaq Ahmed - He had a deadly googly, but tended
to bowl it too often, thus nullifying the 'shock' factor.
The requirements for the same are:
The grip is same as that of the leg-spinner, but the closed action is used.
Flipper involves a lot more use of the body to extract more pace and nip off the pitch.
The ball is bowled similarly as leg spinner but instead of the third finger pushing the ball, all the fingers are dragged down the back of the ball. Release the ball out of the front of the hand through the fingers.
The ball is pitched short of length.
The only one of his kind: Jack Iverson, who played Test cricket for Australia in 1950-51, was a unique leg-spinner. He had huge hands and therefore was able to hold the ball between the index and the ring finger with the middle finger being underneath the ball. He imparted spin to the ball by flicking the middle finger. This action enabled him to bowl more googlies than the regular leg-break and deceive the batsman.