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A noball is an illegal delivery signaled by either of the two Ground Umpires for a variety of reasons as listed below. A noball results in a single run added to the batting side in the Extras along with an additional delivery to be bowled.
Reasons for an Umpire to signal a no-ball :
1. Mode of delivery
The Umpire shall indiacte to the striker whether the bowler intends to bowl over or round the wicket, over arm or under arm or right or left-handed. Failure on the part of the Bowler to indicate in advance a change in his mode of delivery is unfair and the Umpire shall call and signal “no ball”
2. Fair delivery – The arm
For a delivery to be fair the ball must be bowled not thrown.
If either the Umpire is not entirely satisfied with the absolute fairness of a delivery.
In this respect he shall call and signal “no ball” instantly upon delivery.
3. Fair delivery – The feet
The Umpire at the bowler’s wicket shall call and signal “no ball” if he is not satisfied that in the delivery stride
(a) The Bowler’s back foot landed within and not touching the return crease or its forward extension
or
(b) some part of the front foot whether grounded or raised was behind the popping crease.
4. Bowler throwing at striker’s wicket before delivery
If the bowler, before delivering the ball, throws it at the striker’s wicket in an attempt to run him out, the Umpire shall call and signal “no ball” (Batsman unfair stealing a run)
5. Bowler attempting to run out non-striker before delivery
If the Bowler, before delivering the ball, attempts to run out the not-striker, any runs which result shall be allowed and shall be scored as no balls. Such an attempt shall not count as a ball in the over. The umpire shall not call “no ball”.
6. Infringement of law by a wicket-keeper or a fieldsman
The umpire shall call and signal “no balls” in the event of the Wicket-keeper infringing Law 40.1(position of wicket-keeper) or a Fieldsman infringing Law 41.2 (limitations of onside fieldsman) or Law 41.3 (position of fieldsman).
Revoking a call
An Umpire shall revoke the call “no ball” if the ball does not leave the Bowler’s hand for any reason. Law 23.2 (either umpire shall call and signal “dead ball”)
Penalty for a noball
A penalty of one run for a no ball shall be scored if no balls are made otherwise.
Runs from a No Ball
The striker may hit a no ball and whatever runs result shall be added to his score. Runs made otherwise from a no ball shall be scored no ball.
Out from a no ball
The striker shall be out from a no ball if he breaks Law 34 (hits the ball twice) and either batsman may be run out or shall be given out if either breaks Law 33 (handled the balls) or Law 37 (obstructing the field).
Batsman given out off a no ball
Should a batsman be given out off a no ball the penalty for bowling it shall unless runs are otherwise scored.
Notes:
(a) Definition of a throw
A ball shall be deemed to have thrown if in the opinion of either Umpire. The process of straightness the bowling arm. Whether it be partial or complete, take place during that part of the delivery swig which directly precedes the ball leaving the hand. This definition shall not debar a bowler from the use of the wrist in the delivering swing
(b) No Ball not counting in Over : A no ball shall not be reckoned as one of the over . Law 22.3 (no ball or wide ball)