Several things affect people in different ways and for different reasons, several different reason for the same person even. Why? Well for something we hear about but quickly forget and that is "you will never shoot the same shot twice in pool or will not remember the last time the next time it happens".
You will never have to play the same shot for the same position and for the same stakes, lay out a rack be it 8 or 9 ball with as easy an out humanly possible and you will never duplicate the out exactly, hell mark you CB spot with the paper rings for each shot and you won't land of all.
So for some of us and what i have found to affect most amateurs and pros but them far less than us is a lack of confidence in the shot, take a simple cut shot say one diamond by one diamond from the corner and the CB one diamond above the spot, make it and see where the CB stops then try to do the same again (land on that spot) you will find that you start adding muscles and twitches to the shot the more or harder you try to get to that spot.
My friend get to the table and make balls and no not running a rack over and over shoot one shot over and over then slightly change the angle by two balls and keep working your way till it's either dead straight or you have exhausted shooting with with top, left, right and draw, build your confidence in "making the ball" and not being swayed by the other elements.
A shot maker doesn't suffer this problem as often i'm sure but do when it comes time to playing position, key position, confidence in making balls my friend and in that process understand the shot which in turn will allow you to now do different things with it will reduce those days.
May we never see those days again.
