Why was the Arbiter called? Yu Yangyi vs Grigoriy Oparin | 6th Sharjah Masters

With two wins and four draws Yu Yangyi had a score of 4/6 when he came to round seven to face Grigoriy Oparin. Though he had an early advantage Grigoriy managed to equalize but what happened that he had called the arbiter?

Video: ChessBase India

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