You can answer this questions?If you can you have a good knowledge about chess.try this.
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who is the 8th world chess champion?
who is the 6th world chess champion?
who is the world chess champion now?
who is the best player after world chess champion now?
who is "Emanual Lasker"?
who is "Mikhail Botvinik"?
1)Petrosian (I'm not sure)
2)Alexander Alekhine
3)Magnus Carlsen
4)Fabiano Caruana
5)Lasker is the second world champion
6)Botvinnik is the world champion that could never hold his title but won it back two times (3 world championship titles in total)