Two chess players are playing a correspondence game. White lives at the South Pole and Black at the North Pole. The postal service is rather slow and play proceeds at about one move per year!
After 15 years of play, White makes a daring sacrifice, the consequences of which are by no means clear. A year later, as he sees the postman returning, he is very excited. He thinks “Will Black take my queen? Is the sacrifice sound?”
He tears open the reply and sees…
(French word meaning “I adjust”)