The ceremonial game - the second time AlphaGo has gone head-to-head with a master Go player in a public showdown - represents a major bridge-building exercise for Google in China, following a charm offensive in recent years.
It has announced plans to bring some services back to the country, including its app store Google Play.
In March it also said Chinese users would be able to access the Translate mobile app, marking its most recent success launching a previously banned service.
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