After about two hours, the lower right corner of the black side became a site of intense combat. Originally Chen's white pieces had the upper hand, but with move 49, Chou made an unexpected play that successfully blocked white's advance. At that point the match turned from white having a slight advantage to being evenly balanced.
棋賽進行約 2 小時，黑方右下角成兩人短兵相接之地，原本陳詩淵的白方取得優勢，但周俊勳的黑 49 手，下出白方意料之外的好棋，成功阻擋了白棋攻勢，此時棋賽已由白方略佔優勢轉為五五波。