I'm convinced that some statements re: martial arts levels in the novels by Jin Yong have little to no merit.
I'm not talking about ambiguous descriptions such as "someone has reached the level of perfection." Even very specific, quantatative statements are sketchy.
For example, Jin Yong said that Guo Jing would take about 1000 stances to win against GWM. I can't imagine it would take that long. GWM was sub-Great level almost every time he appeared, despite statements saying he was Great-level.
When GWM encountered Zhou Botong at Kublai Khan's camp and Passionless Valley, it was obvious that GWM was no match for Zhou. Zhou toyed with GWM and the other Mongolian warriors like children.
The only way Guo Jing would need 1000 stances to defeat GWM, is if they fought mechanically and robotically without using their mind. Otherwise, I don't think it should take more than 200 stances.