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ANATOLY KARPOV
KARPOV was a FIDE champion from 1993 till 1996 -
Period: to
FIDE CHESS WORLD CHAMPIONS
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ALEXANDER KHALIFMAN
Alexander Khalifman became champion in 1999 and retained his title till 2000. -
Viswanathan Anand
Anand became a FIDE champion in 2000 and retained his title till 2002 -
Ruslan Ponomariov
Ponomariov became world champion in 2002 and retained his title till 2004