Ah, when the bowler makes the ball dance in the air or off the pitch, that's swing and seam. The 'position' is just how he holds the seam to make it happen. It stops swinging when the ball gets old or the air gets too heavy and damp.
I say this from watching our local matches in the maidan. A new tennis ball will swing wildly for two overs, then it's just straight—like my cab on a smooth highway after the morning's bumpy village roads. The fancy theories are less important than watching the shine go.
#cricket#sports
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