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Video Game / OXO

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OXO (or Noughts and Crosses) is a player vs. computer Tic-Tac-Toe game which was written by Alexander S. Douglas in 1952 for the one-of-a-kind EDSAC computer at the University Of Cambridge. The single-player "game" was designed for academic purposes — Douglas used OXO on the famous EDSAC to study the "Interactions Between Human and Computer".

OXO was the one of the first digital graphical games to run on a computer, and was rather simple to use — the player played against the computer, with output displayed on the computer's 35×16-pixel cathode ray tube. The source code was short, yet played a perfect game of noughts and crosses. There is contention if it was the first digital graphical game. Another game, written by Christopher Strachey, created a version of draughts, was also run on the EDSAC in the summer of 1952. While the date that Strachey ran his program was documented, it is unclear when OXO was first played, so it is unknown which one predated the other.

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