THE GIRL WITH THE THUNDERBOLT KICK (aka GOLDEN SWALLOW, 1968) is a Shaw Bros. costume swordplay drama notable for co-starring the studio's top male action star, Jimmy Wang Yu, with the studio's then-reigning swashbuckling diva Cheng Pei Pei (THE THUNDERING SWORD). Wang Yu plays the notorious killer Silver Roc and Cheng plays his childhood sweetheart Golden Swallow, whom he hasn't seen in years (a reprise of a character the same actress played in King Hu's COME DRINK WITH ME, 1966). Golden Swallow follows Roc's trail of blood and is accompanied by Golden Whip Hand (Lo Lieh), who is in love with her but helps her track down Silver Roc. Midway through the film they all meet, but Silver Roc quickly challenges Whip Hand to a duel after the latter condemns Roc for an earlier instance of cold-blooded killing. That's pretty much the whole plot and it takes a long time getting to the final duel.
There are plenty of swordfights here, but they're fairly stylized, with lots of leaping around, twirling of swords, soft blows, and unconvincing fighting skills. Cheng Pei Pei has great screen presence, but she's more of a dancer than a fighter. There's an undertone of unrequited love that's rather poignant at times. Following this film Wang Yu turned to a harder-edged brand of martial arts film with THE CHINESE BOXER (1970), generally considered the first pure kung fu film.
ADDENDUM (12/24/18): Watching this film again on the Dragon Dynasty DVD, in Mandarin with English subs. and the original music score, makes a world of difference. It's a beautiful film, a sweeping love story, with action scenes a dramatic by-product, and great performances by all concerned, especially the three leads. I was also struck by the breathtaking cinematography by Pao Hsueh Li, shot on both lavish studio sets and picturesque mountain locations. I regret that the above review wasn't as enthusiastic, but it was based on watching a pan-and-scan Cantonese language VHS tape with plastered-on music cues from a James Bond soundtrack.