EZoto wrote:
I would like to know more of Botvinnik and Kan. Seems like Kan use to
have his number at times and they had quite a few tussles. Not Sultan
Kan by the way.

Do you mean Ilya Abramovich Kan (1909-1978)? If so, he had
Botvinnik's number for a very short time. Chess Base shows 19 games
between them, dating 1929-1955, with the score +13 -2 =4 in Botvinnik's
favor. Kan's wins were in 1929 and 1935. Kan was good (one of the
original IMs in 1950), but not in Botvinnik's class.
BTW, for the other player you mention, the correct spelling is Sultan
Khan.