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Lukas Kleckers of Germany competes during the first round match against Mark Allen of Northern Ireland at 2017 UK Snooker Championship in York, Britain on Nov. 29, 2017. Mark Allen won 6-2. (Xinhua/Han Yan)

Lukas Kleckers of Germany competes during the first round match against Mark Allen of Northern Ireland at 2017 UK Snooker Championship in York, Britain on Nov. 29, 2017. Mark Allen won 6-2. (Xinhua/Han Yan)