Immortal Game

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The Immortal Game was a chess game played in 1851 by Adolf Anderssen and Lionel Kieseritzky. It was played while the London 1851 chess tournament was in progress, an event in which both players participated. The Immortal Game was itself a casual game, however, not played as part of the tournament. Anderssen won the game by allowing a double rook sacrifice, a major loss of material, while also developing a mating attack with his remaining minor pieces. Despite losing the game, Kieseritzky was impressed with Anderssen's performance. Shortly after it was played, Kieseritzky published the game in La Régence, a French chess journal which he helped to edit. In 1855, Ernst Falkbeer published an analysis of the game, describing it for the first time with its sobriquet "immortal".

The Immortal Game is among the most famous chess games ever played. As a miniature game, it is frequently reproduced in chess literature to teach simple themes of gameplay. Although Kieseritzsky himself indicated that the game ended before checkmate, the Immortal Game is frequently reproduced with a brief continuation involving a queen sacrifice—a further loss of material—leading to checkmate. This continuation is commonly presented as part of the complete game, as if the final moves were actually played as part of the real historical game. Some authors also permute certain moves, deviating from Kieseritzky's report, although such permutations typically give rise to a transposition in which a distinct line of play eventually returns to the moves and positions reported by Kieseritzky.

Although both players made moves which are regarded as unsound by modern players, the game is appreciated as an example of the romantic school of chess, a style of play which prized bold attacks and sacrifices over deep strategy. The game—especially its mating continuation—is also appreciated for its aesthetic value, as a plausible example of how a player with a significant material deficit can give mate, provided that an advantageous position exists. The continuation's mating position is a model mate, a strong form of pure mate in which all of the attacker's remaining pieces contribute to the checkmate, while the mated king is prevented from moving to any other square for exactly one reason per square. In 1996, Bill Hartston called the game an achievement "perhaps unparalleled in chess literature".^[1]