Each frame consists of two deliveries, unless you knock all 10 pins down on the first delivery, this is called a strike. If you knock them all down after the second delivery its a spare. In the tenth frame however, if you get a strike or spare, you get three deliveries. The total number of pins for each frame gets added together unless you roll a strike or spare. If you roll a strike its worth 10 plus what you get on your next 2 deliveries. A spare is worth 10 plus your next delivery. This means in a frame where there's a strike or spare the score for that frame can't be filled in until your next two or one deliveries have been thrown respectively.
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