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A computer defeated China's top player of the ancient board game go on Tuesday, earning praise that it might have finally surpassed human abilities in one of the last games machines have yet to dominate. AlphaGo has improved markedly since it defeated South Korea's top competitor last year and is a "completely different player," Ke told reporters. Last year, it defeated South Korea's Lee Sedol. Four takeaways from AlphaGo's victory over a world champion Go player How a human Go champion finally beat Google's artificial intelligence machine