The clash reached a dramatic conclusion on move 21 as Black became bogged down in intricate calculations and flagged out, conceding victory to Tuong Vy.
Tuong Vy dictated the tempo with aggressive opening coordination, posing sharp tactical dilemmas that drained Black's clock. Overwhelmed by the mounting positional pressure and ticking timer, Dugu Qiubai was unable to find a timely defense and suffered a heartbreaking timeout defeat.