How did Google's AlphaZero beat the world's best chess computer?

Google’s AlphaZero, after just four hours of training, last week trounced the highest rated chess engine in the world, Stockfish. How did it do this? 

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Google's AlphaZero surpassed the sum of human chess knowledge

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Google AI teaches itself 'superhuman' chess skills in four hours

AlphaZero: The AI from Google which mastered Chess in 4 hours

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In Just 4 Hours, Google's AI Mastered All The Chess Knowledge in

Google's AlphaZero AI teaches itself Chess in four hours, then