challenge: What event in 1993 led to the creation of two separate chess world championships?
  
  A. The founding of the World Chess Federation
  B. The introduction of the knock-out format in FIDE championships
  C. Garry Kasparov and Nigel Short breaking away from FIDE to play their world championship match under the auspices of the Professional Chess Association
  D. The signing of the Prague Agreement
  Answer: 