The introduction of the huff
The rule of the huff has been introduced at the latest in the first half of the 15th century. At the latest, an earlier introduction cannot be excluded. We know this by studying the draughts jargon from the past.
In 14th century England, draughts was called checkers. A player was free to take or not.
Not so much later, a second name for draughts came into being: draughts. The first reference of this game name is from 1440. From this we may conclude that in England draughts was played with the huff at the latest in the first half of the 15th century. If the huff was invented in England or in any other European country is unknown.