It is by adopting this form that the style would see the appearance of competition close to kickboxing which will become K1. In 1991, ishi settled in Tokyo and he invited 5 participants of the US Oyama Karate(Shigeru Oyama) to meet 5 Seidokan karate experts in a competition on a tatami in the presence of 7500 spectators. In 1992, Ishi organized a very grand official reception joining together more than 9000 people and of which the star fight was between Adam Weatt to Rob Kaman. This official reception will be used as springboard for Ishi to finally carry out his dream by setting up the tournament joining together the champions of several styles, all starting with K: Kung fu, Karate, Kempo, Kickboxing. In 1993, the first K1 big price sees the day in close collaboration with the national Fuji TV. This first competition with 100 000 $ saw the confrontations between Maurice Smith, Peter Aerts, Ernesto Hoost, Chang Peuk, Atokawa and the final winner Bronco Cikatic.
From there, given the sucess of this experience, Ishi renewed it frequently by inviting the best, world heavy weights of kickboxing and karate to figure at receptions with with the applications in the rules of K1 and the commitment of the Japanese. For this competition which is growing today, K1 has imposed itself as the world reference as regards kicking sport. Ishi organized approximately a K1 every two months in Japan during which the best heavy weights of the circuit fight between themselves in superfights and remains faithful every year to the principle of the tournament organizing this one towards the end of the autumn making it possible to crown the champion of the year.