The concept of manipulating the height of a stack so that it can land precisely on a critical space. It's a matter of counting and one-digit addition. Notice that this doesn't necessarily me [..]

Highly accurate marksmanship. ''Daniel Boone's sharpshooting earned him a place in the annals of the American west.'' * Bret Harte *: Owing to a want of proper concert among ourselves, I think, [..]