Also called the count-back force, in which between ten and twenty cards are counted of, then the digits of the number added and the result counted from the packet to arrive at the force card. In Genii (Vol. 62, No. 4, April 1999, p. 46) Phil Goldstein writes: “the Count-Back Force…seems to have first seen print in Billy O'Connor's 'After the Four Ace Trick' in the June-Sept. 1935 Magic Wand, although there is evidence to suggest that it is older than that.”