US scientists have developed a computer programme that they say can't lose at the popular board game draughts.After 18-and-a-half years and sifting through 500 billion billion (a five followed by 20 zeroes) draughts positions, Dr. Jonathan Schaeffer and colleagues of the University of Alberta have built a draughts-playing computer program that cannot be beaten. Completed in late April this year, the program - Chinook - may be played to a draw but will never be defeated.
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