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How is a spare scored in tenpin bowling?

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In tenpin bowling, a spare is recorded when you knock down all remaining pins on your second delivery of a frame, after failing to clear them all on the first roll.1

The scoring for a spare is calculated as 10 pins plus the number of pins you knock down on your very next delivery. Because a spare relies on the subsequent roll to determine its final value, the score for that frame cannot be finalized until that next ball is thrown.1