Kung Fu Dice is a Free Game (downloadable pdf from http://www.deep7.com, go to site map and then Free Downloads) of kung fu dice combat.
From the website:
A fast and furious dice game where you pit luck and skill against your worthy opponent. Includes easy to learn rules to get you started in about 5 minutes, as well as more advanced play variations for when you're ready to become a Kung Fu Master! And talk about affordable!
Using six-sided dice to represent limbs and a 4 sided die to represent avoidance, players roll together and compare the values. Matched values are removed and remaining values are scored as hits (minus the value of the 4 sided die.) Weapons are represented as special 6 sided dice that can only be countered by other weapons.
A simple, fast game of luck. A few optional rules exist that add a tiny bit of strategy. All in all, a decent combat system for an ultra-light RPG, or a fun way to batter one another without thinking hard.