A player (it) has a target word and other players try to find out the word by making guesses in turns.
After every guess, the it tells the shortest alphabetical interval containing the target word, with reference to guesses made up to that point. The next guesser now tries a word in the
interval, and the it updates the interval accordingly.
Whoever finds the target word becomes the new it and picks a new target word.
EXAMPLE (Three players: It, A, B; target word 'now')