Name the players thet have disputed an official (1886-1990, 2006-2023) or split ( 1993-2005) World Chess Championship match.
https://en.wikipedia.org/wiki/List_of_World_Chess_Championships
In 1948, 2005 and 2007 no match was disputed, since they were round-robin tournaments. Only the winner is required.
FIDE's championships in 1998, 1999, 2000, 2002 and 2004 were single-elimination tournaments. Both finalists are required.