Neurogammon is a computer backgammon program written by Gerald Tesauro at IBM's Thomas J. Watson Research Center.
It won the 1st Computer Olympiad in London in 1989, handily defeating all opponents.
[2] Neurogammon contains seven separate neural networks, each with a single hidden layer.
One network makes doubling-cube decisions; the other six choose moves at different stages of the game.
In 1992, Tesauro completed TD-Gammon, which combined a form of reinforcement learning with the human-designed input features of Neurogammon, and played at the level of a world-class human tournament player.