I'm not so sure anymore. Yesterday I watched a documentary on Kasparov (best chess player) and apparently in Russia (where a lot of the best chess players are) those kinds of claims are fairly common in competition. Opposing sides claiming that people used energies and magnets to influence and distract players and they have even dismantled the chairs the players sat in to try to find the magnets they were sure were hidden in there. Russians are some superstitious people it seems.
XI Wiki


