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Shakhriyar Mamaderov (L) of Azerbaijan and Sergey Karjakin of Russia compete during a first round match of the chess tournament 2019 Croatia Grand Chess Tour in Zagreb, Croatia, June 26, 2019. (Xinhua/Matija Habljak)
Shakhriyar Mamaderov (L) of Azerbaijan and Sergey Karjakin of Russia compete during a first round match of the chess tournament 2019 Croatia Grand Chess Tour in Zagreb, Croatia, June 26, 2019. (Xinhua/Matija Habljak)