Core Wars: n.

A game between assembler programs in a machine or machine simulator, where the objective is to kill your opponent's program by overwriting it. Popularized in the 1980s by A. K. Dewdney's column in Scientific American magazine, but described in Software Practice And Experience a decade earlier. The game was actually devised and played by Victor Vyssotsky, Robert Morris Sr., and Doug McIlroy in the early 1960s (Dennis Ritchie is sometimes incorrectly cited as a co-author, but was not involved). Their original game was called ‘Darwin’ and ran on a IBM 7090 at Bell Labs. See core. For information on the modern game, do a web search for the ‘ FAQ’ or surf to the King Of The Hill site.