In chess an exchange sacrifice occurs when one player gives up a rook a minor piece (knight or bishop). It is often used to destroy the enemy pawn structure (as in several variations of the Sicilian Defence where Black plays RxNc3), to establish a minor piece on a strong square (often threatening the enemy king), or to improve pawn structure (creating, for example, connected passed pawns). Tigran Petrosian, the world Champion from 1963-1969, was well known for his especially creative use of this device; in the game Reshevsky-Petrosian, Zurich 1953, he sacrificed the exchange on move 25, only for his opponent to sacrifice it in return on move 30 (the game ended a draw).
Exchange is linked to the survival of primitive hordes in the same way as privative appropriation; both together constitute the fundamental axiom on which the history of mankind has been built up to the present day.
The playful Roman promise to sacrifice a cock to the gods in exchange for a peaceful voyage remained outside the grasp of commercial measurement because of the disparity of the things that were exchanged.
The sacrifice of the master is followed by the last stage of sacrifice, the sacrifice of the specialist.
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