Simplify the following text for a Grade 9 native English-speaking person.
Original: Along with being a top-level professional , Grischuk is also known as one of the best blitz chess players in the world , having once held the record for highest rating achieved on the Internet Chess Club .
Simplified: Grischuk is also one of the best blitz chess players in the world , having once held the record for highest rating achieved on the Internet Chess Club .