Part 1: http://www.andreykurenkov.com/writing/ai/a-brief-history-of-game-ai/
Part 2: http://www.andreykurenkov.com/writing/ai/a-brief-history-of-game-ai-part-2/
Part3 http://www.andreykurenkov.com/writing/ai/a-brief-history-of-game-ai-part-3/
History of Artificial Intelligence (in History of Computing, University of Washington)