Every ball delivered, unless it be declared a dead ball by the umpire, shall be counted against the player.
Pins which are knocked down by another pin rebounding in the play from the side partition or rear cushion are counted as pins down.
Pins which are knocked down or displaced from any cause except by a fairly delivered ball shall in all cases be respotted.
Should a player by mistake roll on the wrong alley, or out of his turn, or be interfered with in his play by another bowler or spectator, or should any of the pins at which he is playing be displaced or knocked down in any manner before his delivered ball reaches the pins, or should his ball come in contact with any foreign obstacle on the alleys, then the ball so delivered by him shall be immediately declared a dead ball by the umpire, and such ball shall not count, and shall be immediately re-rolled by the player after the cause for declaring such ball dead has been removed.
Pins which are knocked down by a fair ball, and which remain lying on the alley or in the gutters, are termed dead wood, and shall be removed before the next ball is rolled.
Should a standing pin fall by removing dead wood, such pin or pins shall be at once respotted.
Should a pin be broken or otherwise badly damaged during the game, it shall be at once replaced by another as nearly uniform with the set in use as possible. The umpire shall in all such cases be the sole judge in the matter of replacing such pin or pins.
Each player shall roll two balls in each frame except when he shall make a strike, or when a second strike or spare is made in the tenth frame, when the player shall complete that frame by rolling a third ball. In such cases the frame shall be completed on the alley on which the first strike or spare is made.
A strike is made when the player bowls down the ten pins with his first ball delivered in any frame and is credited and designated in the score by an X in the upper right hand corner of the frame, and the count in such frame is left open until the player shall have rolled his next two balls, when all pins made, counting ten for a strike, shall be credited therein.
A spare is made when the player bowls down all the pins with his second ball in any frame, and is credited and designated with / in the upper right hand corner of the frame in which it is made. The count in such frame is left open until such player shall roll his next ball in the succeeding frame, when the number of pins rolled down thereby shall be added to the ten represented by his spare, and the total shall be credited therein.