One of these events almost did not happen until Jim Slater doubled the prize fund and Henry Kissinger called one participant.
A participant in one of these events accused a rival of doing sketchy things in the bathroom, dubbed "Toiletgate," and those two people still refuse to shake hands with each other. Rival ones of these events were held from 1993 to 2005 by the PCA, including one in 1995 in the World Trade Center. These are the most important of the events that can reach a sudden death "Armageddon" round. Wilhelm (*) Steinitz is generally considered the first winner of these events. One of these events almost did not happen until Jim Slater doubled the prize fund and Henry Kissinger called one participant. That one of these events in Reykjavik in 1972 was called the "Match of the Century" and dethroned Boris Spassky, ending 24 years of Soviet domination. For 10 points, name these events officiated by FIDE, the most recent of which was won by Magnus Carlsen.
A participant in one of these events accused a rival of doing sketchy things in the bathroom, dubbed "Toiletgate," and those two people still refuse to shake hands with each other.
World Chess Championship [prompt on “Chess tournament” or “chess game;” do not accept the Chess Championship of any country or region other than “World”]