you must be referring to the game of the century against Bryne. Fischer played that game when he was 13 years old.

In later years he rarely sacrificed much.

Fischer's style of chess is considered the most universal in that he has no preferences he just plays the best moves for the position.

Kasparov considered Fischer to be 10 years ahead of the top grandmasters. In 1972 he had scores over the grandmasters (candidates matches) of 6-0.

Yes. He was incredible.