Free Interactive Bowling Tools
Calculate your target breakpoint board and 3-6-9 spare feet adjustments instantaneously.
The Rule of 31 is the classic PBA Tour formula for finding your target exit board at the end of the oil pattern. Subtract 31 from the total oil pattern length in feet to determine your ideal exit board.
Select the pin target to calculate your foot shift relative to your strike stance while keeping your eye target over the center arrow.
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