In the event that all ten pins are felled by any one player in a single box, by no more than two throws (just as in tenpins) bonuses are awarded for a strike or spare. A strike is achieved with just the first delivery downing all ten pins, with a spare needing two throws, again just as in the tenpin sport. If all ten pins are felled by rolling all three balls in a box, the result is a derby, marked by an X (as in the Roman numeral for ten) but no additional points are awarded. (In tenpin bowling, a strike is often scored with an X).