The signature of this pair of China chess is Xu Yinchuan, the national chess champion. How much is it worth? How much is Xu Yinchuan's signature worth?
The value of a signature depends on its influence and market. It's worthless to people who don't know chess, but it's valuable to people who worship Xu Yinchuan. It's hard to tell. Generally, people who can get Xu Yinchuan's extra-large autograph are also people who love chess and have certain chess skills. I'm afraid they won't have the idea of selling autographs.