Ten-pin bowling Effectively, there are three kinds of marks given in a score; a strike (all ten down in the first ball), a spare (all ten down by the second ball), and an open (one or more pins still standing after the second ball). A strike earns ten pins plus the pins for the next two balls thrown. (For example, if a player got a strike then followed with a 7 and 2 in the next frame, the value for the strike frame would be 10+7+2, or 19; if the player got a strike followed by another strike the next frame and
Bowling ball diameter in the range of to . The surface of the ball is required to include markings to indicate the manufacturer's brand name, the name of the ball, the center of gravity (before drilling), the orientation of the core (the Pin), and the axes of the high and/or low radius of gyration (as applicable). Additionally, markings must include an individual serial number and the logo of the USBC. Holes are allowed to be drilled into a bowling ball for a variety of reasons, and bowlers must be able to demonstrate that such holes can be used as claimed. Up to