prize13-7, Exercise 2: The split of 1993

Model answer (check the details):

In 1993 the champion, Garry Kasparov, and his challenger, the Englishman Nigel Short, broke away from FIDE and played their match under a new body, the Professional Chess Association. FIDE responded by naming its own champion, and for about thirteen years there were two rival world titles, until a reunification match in 2006 between Vladimir Kramnik and Veselin Topalov.

It shows that a title has authority only so long as the players, the organisers and the public agree to recognise it. FIDE owned the name, but the players owned the games that gave the name its value; when the best players left, the value went with them.

Care: the details are from general knowledge and should be checked against a reliable history.