Super long games like chess takes a toll on the mind and body especially when you sit down for hours without sustenance.

I've seen top chess players carrying candy bars, chocolates etc just for purpose to get a sugar boost and maintain alertness.

Here is one of the top boards..


Ian Udani is also another player I know who regularly chomps down a chocolate bar or two in the middle of a long game. Only this time he cheekily hid his chocolate before I could take a picture. Perhaps a secret weapon he does not want to share ? :)