Corral is...a one-dimensional simulation of the two- (and almost three-) dimensional problem of catching [a horse] for anything other than food. The main reason for confining [the horse] to only one dimension is simply to conserve paper on hard-copy terminals. Even so, the presentation is very effective on a video display unit.
Corral was written by Colin Keay and published as type-in source code in Creative Computing Vol. 4, No. 6, November/December 1978.