 Complete the following phrase:  The first generally recognized world championship took place in 1886, when the two leading players in the world, Wilhelm Steinitz and Johannes Zukertort, played a match, which was won by Steinitz. From 1886 to 1946, the champion set the terms, requiring any challenger to raise a sizable stake and defeat the champion in a match in order to become the new world champion. Following the death of reigning world champion Alexander Alekhine in 1946, FIDE the International Chess Federation took over administration of the World Championship, organizing their first championship in a 1948 tournament. In 1993, reigning champion Garry Kasparov broke away from FIDE, which led to a rival claimant to the title of World Champion for the next thirteen years. The titles were unified at the 