> When Karpov's team sent him a blueberry yogurt during a game without any request for one by Karpov, the Korchnoi team protested, claiming it could be some kin

> When Karpov's team sent him a blueberry yogurt during a game without any request for one by Karpov, the Korchnoi team protested, claiming it could be some kind of code. They later said this was intended as a parody of earlier protests, but it was taken seriously at the time. https://en.wikipedia.org/wiki/World_Chess_Championship_1978 https://en.wikipedia.org/wiki/World_Chess_Championship_1978 > On the 25th move of game 2, a waiter delivered a tray with a glass of violet colored yogurt to Karpov. After the game Leeuwerik sent a letter to Schmid protesting the yogurt. 'It is clear that a cunningly arranged distribution of edible items to one player during the game, emanating from one delegation or the other, could convey a kind of code message'. Although the letter was almost certainly tongue-in-cheek, Baturinsky took it seriously and suggested that the binoculars Leeuwerik used during the game might also convey a coded message to Korchnoi. https://www.mark-weeks.com/chess/78kk$$01.htm https://www.mark-weeks.com/chess/78kk$$01.htm It's also used a plot point in the musical Chess - https://en.wikipedia.org/wiki/Chess_(musical) https://en.wikipedia.org/wiki/Chess_(musical)