An earlier version of combining chess and boxing was said to have taken place in a boxing club outside London in the late 1970s. The Robinson brothers were in the habit of playing a round of chess against one another after a training session at their boxing club. However, no direct correlation can be made between the Robinson brothers' chess playing and chessboxing. The same goes for the kung fu movie "Mystery of Chessboxing" as well as the Wu-Tang Clan song "Da Mystery of Chessboxin'" (1993).