Boris Spassky (January 30, 1937 - February 27, 2025) was one of the most respected, most popular GMs in the history of chess. He was the 10th World Champion. He won the World Championship against
Tigran Petrosian. Spassky was competent in the openings and has some variations named after him. But it was in the middlegame that he really excelled.
He could win a scientific slow burner against Petrosian or he could be last man standing in a dramatic roller-coaster against Tal. He was known for aggressive, imposing positional play which sometimes incorporated deeply calculated sacrifices. He was also capable of violent, attacking combinations with pieces being sacrificed right, left and center. Best of all he could marry both themes in the same game.
Garry Kasparov said of him: The universal chess style, characterized by the ability to play quite different types of chess positions, is considered by many to derive from that of Boris Spassky. But I think that the general idea that Spassky has a universal style overlooks the fact that from an early age, Spassky had a bent for sharp, attacking play and a good eye for the initiative.