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BOB HIRSHON (host):
An invincible checkers computer. I’m Bob Hirshon and this is Science Update.
It took eighteen years and hundreds of computers, but a team of scientists has finally solved the game of checkers. Led by computer scientist Jonathan Schaeffer of the University of Alberta in Canada, they’ve made a checkers-playing computer program that can’t possibly lose.
JONATHAN SCHAEFFER (University of Alberta):
So for example, if the computer makes the first move of the game, you have seven different moves. And for each one of those seven moves, the computer has a response ready.
In theory, checkers has 500 billion billion possible board positions. But in order to crunch the numbers in less than a lifetime, Schaeffer’s team developed an algorithm that disregards irrelevant positions and choices. He says the algorithm could help other artificial intelligence programs find the best possible strategy for a complex task. I’m Bob Hirshon, for AAAS, the science society.