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The Sicilian Defence is a chess opening that begins with the following moves: . 1. e4 c5. The Sicilian is the most popular and best-scoring response to White's first move 1.e4. The opening 1.d4 is a statistically more successful opening for White because of the high success rate of the Sicilian defence against 1.e4.
The Sicilian Defence, Chekhover Variation (also sometimes called the Szily Variation or Hungarian Variation) is a chess opening named after Vitaly Chekhover, from the game Chekhover–Lisitsin, Leningrad 1938. [1] It is defined by the moves: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Qxd4
In chess, the Sicilian Defence, Alapin Variation is a response to the Sicilian Defence characterised by the moves: . 1. e4 c5 2. c3. It is named after the Russian master Semyon Alapin (1856–1923).
Black has a wide choice of reasonable defences after 1.e4 c5 2.d4 cxd4 3.c3. White sometimes plays 2.Nf3 and 3.c3, which depending on Black's response may rule out certain lines. 3.Qxd4 Nc6 4.Qe3 is the Sicilian Center Game, similar to the Center Game, 1.e4 e5 2.d4 exd4 3.Qxd4 Nc6 4.Qe3.
In this variation, White argues that since the Sicilian Defence (1.e4 c5) is one of the very best responses to 1.e4, acquiring a Sicilian Defence position with an extra move must be superior. In the Sicilian Defence, however, Black rarely plays b6/Bb7, and when a queenside fianchetto is played it is usually in extended form (e.g. a6/b5/Bb7).
The Reversed Sicilian (classified A20–29 in ECO) is another broad category of defence, introduced by the response 1...e5. Note again, that Black can delay playing ...e5, for example 1.c4 Nf6 2.Nc3 Nc6 3.Nf3 e5 whereupon even though ...e5 has been delayed, once it is played the defence is classified as a Reversed Sicilian.
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The Sicilian Defence allows Black to fight for the center by preparing to meet a d2–d4 advance with ...cxd4. Black aims to unbalance the game and fight for a win on move one. The many variations include some of the sharpest and most analysed lines in chess.