The Siu Yiu Sect had the most powerful martial arts in the wulin of DEMIGODS & SEMIDEVILS, and since DGSD is generally considered the era wherein the peak levels of the best fighters were the highest, one could say that the Siu Yiu Sect had the most powerful martial arts in the entire Jin Yong Canon. Moreover, the Siu Yiu Sect also had a library of pirated martial arts manuals representing nearly all the known martial arts styles up to the era of the Northern Sung Dynasty...with four notable exceptions: the Dali Deun Royal Family's 1 Yeung Finger Technique (and its more advanced extension, 6 Mak Divine Swords), the Beggar's Union's Hong Lung 18 Palms and Beat Dog Stick Technique, and the Shaolin Temple's Yik Gun Ging. Why did the Siu Yiu Sect have so much trouble obtaining these martial arts techniques? The Deun Royal Family, the Beggar's Union Chiefs, and the Shaolin monks were formidable opponents, but none of them were more powerful than the Siu Yiu Sect's best fighters. If the Siu Yiu Sect wanted these martial arts, it doesn't seem likely that they would be unable to obtain them.