Did Karpov really only wash his hair when he lost? At the recent Isle of Mann coverage, the topic of conversation was grandmaster superstitions, during which GM Simon Williams conveyed that Karpov would only wash his hair when he lost a game. Apparently he went over 40 games without a loss during a streak, leaving it up to our imagination on the consequences.

Now I know GM Simon Williams is quite the joker, so I'm inclined to believe that this is just one of his jibes, but is there perhaps any truth to this? I found some references to this with Google, but I'm not sure about how authoritative they are.
This story has a very long pedigree going back much further than the GingerGM.

The earliest reference I can find on the internet is from a November 1985 report on the Karpov v Kasparov match in People.com's archive - http://people.com/archive/anatoly-karpov-is-straining-in-vain-to-keep-his-world-chess-title-from-gary-kasparov-vol-24-no-20/


  Unlike his extroverted rival, Karpov — who has all the appeal of a
  cold fish —ignores the crowd. When he intends to play aggressively, he
  emerges onstage clad in a black suit. In keeping with a chess
  superstition, he hasn’t cut his hair during the current match. Indeed
  he seldom seems to wash it, and he has been losing weight to boot.


Paul Hoffman (https://paulhoffman.wordpress.com/2007/11/19/superstition-in-chess/) says he mentions it in his book "King's Gambit"


  In King’s Gambit, I write about superstitions at the board. Players
  who insist in wearing their lucky T-shirt or underwear or keeping
  score with the same special pen. World champion Anatoly Karpov was
  famous for not washing his hair when he was on a winning streak.
  Grandmaster Nigel Short said of Karpov: “Unfortunately, he had long
  tournaments where he never lost a game—the guy got greasy.”


The English Chess forum brought this up in a thread on "Poor Taste" - http://www.ecforum.org.uk/viewtopic.php?t=2045&amp;start=30#p36136 - back in 2010.