Input (grade 10): Guan was captured by Sun's general LÃ 1\/4 Meng; once captured, Sun Quan executed Guan Yu, Jing Province came under Sun's control, and the Sun-Liu alliance ended. Sun nominally submitted to Cao and urged him to take the throne but Cao refused.
Output (grade 8): In alliance with Cao Cao, Sun Quan's general LÃ 1\/4 Meng captured Guan Yu in 219 and slayed him along with his son, Guan Ping.