Intelligence is calculated by IQ power of the person. Chess is one of the game which improves your IQ power. The most IQ having person till found was a student. He was very good at mathematics skills. Even there are two great chess players who were in the top list of world with high IQ powers.
There are also many scientists in the list of Top 10 with high IQ powers. Many of them are well known for the world for their achievements in life. Kasparov is one them who is a chess player and world champion for many years. He is now retired from chess.