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gambit
A gambit (from ancient Italian ''gambetto'', meaning "to trip") is a chess opening in which a player, more often White, sacrifices material, usually a pawn, with the hope of achieving a resulting advantageous position.〔Edward R. Brace, ''An Illustrated Dictionary of Chess'', Hamlyn, 1979, p. 114. ISBN 0-600-32920-8.〕 Some well-known examples are the King's Gambit (1.e4 e5 2.f4), Queen's Gambit (1.d4 d5 2.c4), and Evans Gambit (1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4). A gambit used by Black may also be called a gambit (e.g. the Latvian Gambit—1.e4 e5 2.Nf3 f5 or Englund Gambit—1.d4 e5), but is sometimes called a "countergambit" (e.g. the Albin Countergambit—1.d4 d5 2.c4 e5 and Greco Counter-Gambit, an old-fashioned name for the Latvian Gambit).
The word "gambit" was originally applied to chess openings in 1561 by Spanish priest Ruy López de Segura, from an Italian expression ''dare il gambetto'' (to put a leg forward in order to trip someone). Lopez studied this maneuver, and so the Italian word gained the Spanish form ''gambito'' that led to French ''gambit'', which has influenced the English spelling of the word. The broader sense of "opening move meant to gain advantage" was first recorded in English in 1855.
== Strategy ==
Gambits are often said to be 'offered' to an opponent, and that offer is then said to be either 'accepted' or 'declined.' If a player who is offered a gambit captures the piece (and thus gains material) the gambit is said to be accepted. If the player who was offered the gambit ignores it and instead continues his or her development, then the gambit is said to be declined.
In modern chess, the typical response to a moderately sound gambit is to accept the material and give the material back at an advantageous time. For gambits that are less sound, the accepting player is more likely to try to hold on to his extra material. A rule of thumb often found in various primers on chess suggests that a player should get three moves (see tempo) of development for a sacrificed pawn, but it is unclear how useful this general maxim is since the "free moves" part of the compensation is almost never the entirety of what the gambiteer gains. Of course, a player is not obliged to accept a gambit. Often, a gambit can be declined without disadvantage.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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