Ten-pin bowling back row, then three, then two, and finally one in the front at the center of the lane. To ease communication, pins are numbered one through ten, starting with "head pin" in front, and ending with ten in the back to the right. Because of the spacing of the pins and the size of the ball (about in diameter), it is impossible for the ball to contact all pins. Therefore, a tactical shot is required, which would result in a chain reaction of pin hitting pin in a process called "pin scatter". In an ideal shot for a right-hander, the
Five-pin bowling counter pin had to be knocked down to score any points). The rule change went in effect in 1968 in eastern Canada, but the Western Canada 5-pin Bowling Association rejected the change, and as a result there were no national championships until 1972 after the west accepted abolishing the counter pin. (Although some leagues continued with the counter pin system for several more years.) Five-pin bowling allows for more strategy in its play than the ten-pin variant, because of the differing point values for each pin. For example: If a player fails to score a strike in 10-pin bowling, it