Ippathyeradu

The concept was envisioned in 1992 by cartoonist Enki Bilal, and a match of X was a major plot point of his graphic novel Froid Equater. In addition, there is a 1979 movie by director Joseph Kuo called "Ninja ______" whose USA dubbed version was known as "Mystery of X". It does not feature X as understood in this article. This movie is likely an inspiration for the Wu-Tang Clan song "Da Mystery of X" from their first album Enter the Wu-Tang (36 Chambers). The sport is now governed by the WCBO, whose motto is "Fighting is done in the ring and wars are waged on the board” and in July 2008 in Berlin a 19-year old Russian student Nikolai Sazhin won the title of "World Champion" . What is X.

ANSWER: CHESS BOXING