[1] During his career Krongsak became the number 1 ranked fighter at both Rajadamnern and Lumpinee stadiums but never was able to capture the titles.
[2] He holds wins over notable champions of his time: Sagat Petchyindee, Jitti Kiatsuriya, Inseenoi Sor Thanikul, Raktae Muangsurin, Samart Prasarnmit and Changpuek Kiatsongrit.
[4] In 1988 Krongsak moved to France where he began teaching at the Lamy Gym in Paris.
He went undefeated in his second career, capturing world titles against notable European champions of his era such as Ivan Hippolyte, Rob Kaman, Stéphane Nikiéma and Guillaume Kerner.
Krongsak retired from fighting in 1995 and turned to coaching full time, he also organized events in France cooperation with Thai promotors.