- 1). Allow no part of your body to cross the foul line when you're delivering the ball. This is the most common fault.
- 2). Avoid touching any other item of the lane equipment when delivering your ball other than the ball itself.
- 3). Credit no pinfall if the ball bounces back out of the gutter.
- 4). Credit pinfall caused only by the ball. No other item may be used to knock over pins, nor should accidental pinfalls be counted.
- 5). Bowl only when it's your turn.
Source...