Katsuyuki Konishi (小西克幸) is a Japanese speedcuber. He was among the first top Japanese cubers of the modern era. His website, Planet Puzzle, although in Japanese, was for a number of years an important reference for the Fridrich method for western cubers. Along with Shotaro Makisumi's (English-language) website, Katsuyuki Konishi helped to introduce the Japanese system for numbering OLLs from 1 through 57 which is now widespread. Similarly their websites introduced the Japanese system of denoting wide turns on big cubes with the letter w.
He was one of three Japanese cubers who attended World Championship 2003 in Toronto. It was his first overseas trip. (photos)