Kotronias: The Exchange Sacrifice according to Tigran PetrosianThe Art of the Exchange Sacrifice Tigran Petrosian, the ninth world chess champion, was one of the deepest thinkers the chess world has ever seen. His handling of complex positions was legendary. With his rare strategic feeling and exceptional vision, Petrosian gradually became one of the top exponents of the art of the exchange sacrifice, and perhaps the leading protagonist for the positional exchange sacrifice. Acclaimed author Vassilios Kotronias