Indipper

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In cricket, the Indipper is a delivery that combines elements of the dipper, the yorker and the in-swinger. The delivery is meant to be served on or near the batsman's toes, with the ball swinging into the batsman, and dipping (in altitude) at the same time. Indippers are notoriously difficult to bowl, and an incorrectly bowled in-dipper can end up as an easy half volley or a full-toss, which the batsman can take advantage of.

Dipper

At the time of a typical delivery, a fast-bowler flexes his index and middle fingers to add pace. Most bowling grips tend to wrap the fingers behind the ball, around the top and middle of the ball. This tends to impart a slight top-spin (see Magnus Effect) to the ball, which batsmen are accustomed to. The delivery of an indipper differs from an inswinger, in that the indipper is bowled without top-spin, or with a slightly negative top-spin (i.e. the ball spins forward at the top). When bowling a dipper, instead of 'pushing' the ball, the bowler slides his fingers forward over the ball, using the seam friction to impart negative top-spin. The grip is sometimes held perpendicular to the seam, so that the bowler can twist his wrist outward and get a good (negative) top-spin on the seam-line. The perpendicular grip has one disadvantage - that the batsman is able to identify the delivery early and adapt to it. Bowlers like Wasim Akram tend to use the leg-cutter grip for this purpose to avoid compromising his intentions to the batsman.

Effect And Usage

Due to the negative top-spin, the in-dipper tends tends to descend much earlier and faster in its trajectory than a 'normal' delivery. Another effect of the negative top-spin is that, when bowled at other lengths, the dipper tends to skid on the pitch and keep fast and low. This makes is an especially attractive candidate for the yorker and the in-swinging yorker, where the intention is to get the ball under the batsman's bat.

Dippers are generally targeted at the stumps, as the same characteristics which make it difficult for the batsman to meet the ball, also make it harder for the wicket keeper to collect it. In-swinging dippers and yorkers are generally used by fast bowlers as a surprise delivery (typically after a volley of out-swingers). However, as they are extremely difficult to score off, they have been used along with staple deliveries in shorter forms of the game, such as the One Day International and the Twenty-20 formats to prevent the batsman from scoring.

Miscellania

(Request to refactor this information) In traditional cricketing terminology, a batsman's perspective is taken in that an in-swinger refers to a swinging delivery that moves from the batsman's off-side towards the stumps. The terms of usage have become much looser now, so the exact interpretation of how an the in-swinger behaves, depends on the dexterity (handed-ness?) of the bowler and/or the batsman facing the bowler.

Yorkers usually get batsmen dismissed Leg before wicket or Bowled. It is considered easier to bowl yorkers in hot, humid conditions rather than in cold conditions with a soft worn out ball. With reverse swing a yorker is a deadly delivery.

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