He spent his youth studying Krabi Krabong and Muay Thai as well as western fencing and Japanese Judo ( The Ministry of Education began judo contests for students in 1927 after a Thai Prince became interested and propagated its study). He later earned a degree in Physical Education and was one of the first physical education graduates in Thailand when he opened his first Krabi Krabong school in Wat Rakung Kositaram.
During World War II, Por Kruh owned and operated the Moonlight Bar, which attracted a diverse group of foreigners both Allies and Axis alike. He cleverly used this operation as a cover for his covert intelligence gathering work for the Seri Thai, an underground resistance movement that attempted to drive the Japanese forces off Thai soil. Por Kruh Samai taught many of these covert agents and guerilla fighters the most lethal techniques of Krabi Krabong and Muay Thai on the makeshift grounds of the Wat.
After the war, Por Kruh promoted Muay Thai and attempted to bolster support for the growing sport. In 1957, he finally established the Buddhai Sawan School of Swordsmanship with the purpose of perpetuating the art of Krabi Krabong just as it was handed down to him. The same year, His Majesty the King - well aware of the role played by the school in promoting Krabi Krabong awarded Por Kruh Samai with a victory flag as a token of his patronage.
Although most Universities and colleges have an active Krabi Krabong team, the College of physical Education in Bangkok is the only official institution where the sport is taught regularly in a course that was introduced in 1936. The courses at the Buddhai Sawan are the complete Krabi Krabong program that begins with Muay Thai and takes you through the whole system from combat to sport and is currently the only institution that does so.