Here's a diagram about leaving ten pins.
"You are looking at the ball hitting the pocket. The ball could have struck the head pin slightly heavy (diagram A) or it could have struck the head pin slightly light (diagram B). Of course there’s always the question of the ball’s angle of entry to consider."
The typical fix is to move back 6" on the approach, keeping the same spot and mark.
Here's a couple of other threads discussing about ten pins.
http://www.bowlingboards.com/threads...hlight=ringing
http://www.bowlingboards.com/threads...hlight=ringing
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