David R. Sparks: Stories

Kirby did not know what mountains they were. He did know that the Mannlicher bullets of eleven bad Mexicans were whining over his head and whizzing past the hoofs of his galloping, stolen horse. The shots were mingled with yelps which pretty well curdled his spine. In the circumstances, the unknown range of snow mountains towering blue and white beyond the arid, windy plateau, offering he could not tell what dangers, seemed a paradise.

Far out at the edge of the Universe two scientists play a game of wits--Earth to the winner.