I will definitely login and weigh in on the leaning debate.  I agree with the stance that your elbows have to be behind the edge of the back row of cups.  I absolutely hate playing people who release the ball from a spot which essentially six inches to a foot past the front of top row of cups.  We use to have a Drinking Olympics amongst people at my college and leaning was not only not permitted, doing it made you the subject of intense ridicule.

"No, cause it ain't sh*t. Ain't nothing but 10 grand. What's 10 grand to me? Ain't sh*t ... Next time I might shake my d*ck." --Randy Moss
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