What Shami also does is keep one thing constant — the length of his deliveries — while adopting subtle variations to ensure that he is not predictable. Please don’t mistake accuracy for monotony in his case. And, there are several definitions of what a good length is, but the one that is most apt in Shami’s case is this: land the ball in a spot where the batsman is not sure whether to play front or back and aim for the top of off stump.