[5][4] He won an international title at the Samsung Cup in 2017, defeating Tang Weixing in the finals.
In January 2020, while visiting family in his hometown Xiantao, he fell under the COVID-19 lockdown in Hubei; he continued to compete remotely while staying there until April.
He claimed his second major international title in the Quzhou Lanke Cup in June 2023, beating Shin Jin-seo.
[9] Gu is sometimes nicknamed èbà 'evil tyrant' (Chinese: "恶霸"), derived from a username which he used for playing go online, Yìnchéng zhī bà 'Indianapolis tyrant' (Chinese: "印城之霸").
[2] He originally chose the username because he was a fan of the Indiana Pacers in the NBA.