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Exchanges can appear in connection with practically any kind of attacking or defensive chess tactic or combination of tactics. Such tactics can involve checkmating the opponent, avoiding checkmate, gaining a material advantage, avoid losing more material than necessary, helping a pawn to promote, preventing an opponent's pawn promotion, or setting up a draw by any of a couple methods.
That is widely accepted today, but Jacob Sarratt, Howard Staunton, and José Capablanca felt that the exchange was worth two pawns. Tigran Petrosian thought that one pawn was the right value. Wilhelm Steinitz said that a rook is slightly better than a knight and two pawns but slightly worse than a bishop and two pawns. [2]
For example, a knight promotion is a standard defensive technique in a rook versus pawn endgame; [48] a 2006 game between Gata Kamsky and Étienne Bacrot shows such a case. [49] White threatens to capture the pawn or checkmate by Rh1 if the black pawn promotes to a queen, rook, or bishop.
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A game can end in various ways besides checkmate: a player can resign, and there are several ways a game can end in a draw. While the exact origins of chess are unclear, modern rules first took form during the Middle Ages. The rules continued to be slightly modified until the early 19th century, when they reached essentially their current form.
A pawn may move by vertically advancing to a vacant square ahead. The first time a pawn moves, it has the additional option of vertically advancing two squares, provided that both squares are vacant. Unlike other pieces, the pawn can only move forwards. In the second diagram, the pawn on c4 can move to c5; the pawn on e2 can move to either e3 ...