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Russian chess grandmaster and former world champion Garry Kasparov (L) plays against children during a simultaneous chess exhibition match in Zagreb, Croatia, on Dec. 29, 2017. (Xinhua/Relja Dusek)
Russian chess grandmaster and former world champion Garry Kasparov (L) plays against children during a simultaneous chess exhibition match in Zagreb, Croatia, on Dec. 29, 2017. (Xinhua/Relja Dusek)