The three most durable weapons in the Jin Yong universe were likely the Heavy Iron Sword and its two derivatives, the Dragon Sabre and the Heaven Sword. The three weapons were nearly indestructible, and in the case of the Dragon Sabre and Heaven Sword, each was the only implement that could cut through the metal of the other.
In Gu Long's universe, the curved sabre of Ding Pang seemed to have similarly indestructible properties. Could the curved sabre cut through any of the three Jin Yong weapons? Conversely, could the three Jin Yong weapons cut through the curved sabre?