prior to delivery. In both cases, the topspinner is the halfway house between the stock delivery and the wrong'un – in the wrist spinner's case his googly, and in the finger spinner's case his doosra. A topspinning cricket ball behaves similarly to top spin shots in tennis or table tennis. The forward spinning motion impedes air travelling over the ball, but assists air travelling underneath. The difference in air pressure above and underneath the ball (described as the Magnus effect) acts as a downward force, meaning that the ball falls earlier and faster than normal. In cricketing terms, this means that the ball drops shorter, falls faster and bounces higher than might otherwise be anticipated by the batsman. These properties are summed up in cricketing terms as a "looping" or "loopy" delivery. Also, the ball travels straight on, as compared to a wrist spin or finger spin stock delivery that breaks to the left or right on impact. A batsman may easily be deceived by the ball, particularly given that the action is quite similar to the stock delivery. In delivery, the topspinner is gripped like a normal side spinner. For a legspinner the back of the hand faces the cover region and the palm of the hand faces the mid wicket region at release. For an offspinner, these directions are reversed. The ball is then released either with the seam going straight on to the batsman, or with a scrambled seam. A spinner will frequently bowl deliveries with both top spin and side spin. A ball presenting with roughly equal amounts of both is usually called an "overspinning" leg break or off break. Tactically, a bowler will bowl topspinners to draw a batsman forward before using the dip and extra bounce to deceive them. In particular, batsmen looking to sweep or drive are vulnerable as the bounce can defeat them. It is one of the best spinning tactics in the field of finger spinning. Undercutter The undercutter is a delivery bowled by a finger spin bowler in cricket. It is delivered with the arm tilted in such a way that the palm of the bowling hand is facing the sky at point of release. The ball will then be released with a horizontal side spin instead of the orthodox clockwise spin that the stock delivery is released with. This unique angle of spin will cause the ball to swerve