source: Journal of Martial science:
Many people have heard of Kyokushinkai’s founder Mas Oyama, a legend who challenged and defeated artists from around the world who represented many different styles.
One notable fighter that Oyama went up against was a Muay Thai fighter known as the invincible “black cobra” in 1954 at lumpinee stadium, bangkok.
Oyama defeated him with an elbow strike followed up with a triple aerial kick. but he later said in an interview that it was a very close fight.
In 1964, Oyama’s senior disciple, Kurosaki. took a team of 3 karateka to challenge the Thai boxers again at lumpinee stadium. the Karate team won 2 out of 3 bouts. but the ringleader Kurosaki got KOed in the first round with an elbow strike by a Thai middleweight.
That fight changed his life and Kurosaki gave up Karate and trained in Muay Thai, he became the father of Japanese kickboxing.
People like Kurosaki, Yoshiji Soeno another kyokushin legend, and Oyama were some of the Karateka who were bold enough to challenge the strongest muay thai fighters.
They along with the Thai legends such as black cobra is where you get the characters Ryu and Sagat from the street fighter game series.
Yoshiiji Soeno and Oyama came the template for Ryu while Sagat was based off of Black Cobra. (in addition Ken is modeled off of He-man and Karate legend Joe Lewis)
In 1974, soon after the 5th All Japan Open, Yoshiji Soeno, the “Tiger of Kyokushin” (paired with the equally famous Terutomo Yamazaki, known as the “Dragon of Kyokushin”) decided to follow in the footsteps of Mas Oyama. With the blessing of Sosai Oyama, he went on a solo mission to Thailand to re-determine which is the ultimate striking art on Earth – Karate or Muay Thai?
Soeno was tricked into losing weight by the fight promoter, he ended up fighting a middle weight while he was a light weight. Soeno almost got killed in that match but he won by using a Judo sacrifice throw on the Thai fighter an then knocking him out with an aerial roundhouse kick
This caught the attention of Reiba who was also known as the “Dark Lord of Muay Thai” it is said that he was stronger if not as as strong as the black cobra.
Soeno fought against Reiba’s disciple who was known as the “Dark Warrior”. Soeno defeated the Thai fighter with the same triple aerial attack that Oyama used on black cobra 20 years ago.
Reiba was shocked as well as the crowd that his disciple got beat so he challenged Soeno himself.
But Reiba’s brother Daya also a thai boxer and a chief in the Thai mafia intervened and challenged Soeno. Daya fought using a technique known as Pahuyuth which is animalistic an uses every part of the body as a weapon.
After a very bloody match, Soeno won in the 4th round with a flying elbow to the top of Daya’s head knocking him out instantly.
This really pissed off Reiba an he knew he was the only Muay Thai artist who could take on the Karate man. but unfortunately, Reiba was shot and killed by a Thai gangster who was part of a syndicate mob that ambushed him.
It is reported that not even all of the mob men could stop Reiba even though they had weapons and Reiba was empty handed…..but it was the bullet that killed him.
Soeno continued to win matches at lumpinee stadium but he always felt an empty void because he never got to fight the “Dark Lord of Muay Thai” an see what the outcome would be.