The Basics:
Scotland Yard, published in 1985 by Ravensburger and Milton Bradley, was designed by Dorothy Garrels, Fritz Ifland, Manfred Burggraf, Werner Scheerer, Werner Schlegel, and Wolf Hoermann.
Why Scotland Yard is Part of the Games Timeline:
Scotland Yard was the first German game co-published by a major U.S. company; it introduced the one-versus-many mechanic to a broad audience.
Here are the other games I believe are the most culturally and historically significant games published since 1800.
More About Scotland Yard:
In this deduction game, one player is Mr. X, a wanted criminal. The other players are police officers attempting to capture Mr. X. The game is played on a map of Scotland, with three methods of transportation: taxi, bus and subway. Mr. X's whereabouts are generally hidden, although he must show himself at several times during the game. If he eludes capture, Mr. X wins; otherwise, the police win as a team.

