Qin Shi Mingyue: Zhu Zi Bai Jia EP31 - A Brilliant Scheme in the Brocade Bag

It's revealed that Yan Lu and Zhang Liang (Zifang), the second and third household managers of the Confucius School, decided that they need to skills of the reclusive apprentice uncle Xun Zi to cure Duanmu Rong which involves introducing him to Tianming (Ziming). Having convinced Xun Zi that Ziming is a chess master, the household managers arrange a match in which the loser must fulfil a request. After tutoring by Zifang, but Ziming makes an initial mistake, but his playing style unsettles the old master. Zifang helps Ziming win by reflecting light onto the grid pattern of a window. Xun Zi agrees to help revive Duanmu.