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Image:chess zhor 22.png
Image:chess zver 22.png a8 rd b8 nd c8 bd d8 qd e8 kd f8 bd g8 nd h8 rd Image:chess zver 22.png
a7 pd b7 pd c7 __ d7 pd e7 pd f7 pd g7 pd h7 pd
a6 __ b6 __ c6 __ d6 __ e6 __ f6 __ g6 __ h6 __
a5 __ b5 __ c5 pd d5 __ e5 __ f5 __ g5 __ h5 __
a4 __ b4 __ c4 __ d4 __ e4 pl f4 __ g4 __ h4 __
a3 __ b3 __ c3 __ d3 __ e3 __ f3 __ g3 __ h3 __
a2 pl b2 pl c2 pl d2 pl e2 __ f2 pl g2 pl h2 pl
a1 rl b1 nl c1 bl d1 ql e1 kl f1 bl g1 nl h1 rl
Image:chess zhor 22.png

The Sicilian Defence is a chess opening that begins with the moves:

1.e4 c5

At the master level, the Sicilian is the most popular and best-scoring response to White's first move 1.e4. One sixth (17%) of all games between grandmasters, and one quarter (25%) of the games in the Chess Informant database, begin with this opening. Grandmaster John Nunn notes that the reason for the Sicilian Defence’s popularity “is its combative nature; in many lines Black is playing not just for equality, but for the advantage. The drawback is that White often obtains an early initiative, so Black has to take care not to fall victim to a quick attack.” The earliest recorded notes on the Sicilian Defence date back to the late 16th century by the Italian chess players Giulio Polerio and Gioachino Greco.

By advancing the c-pawn two squares, Black asserts control over the d4-square and begins the fight for the centre of the board. In that respect, the move is similar to 1…e5, the next most common response to 1.e4. Unlike 1...e5, however, 1...c5 breaks the symmetry of the position, which strongly influences both players' future actions. White, having pushed a kingside pawn, tends to hold the initiative on that side of the board. Moreover, 1...c5 does little for Black's development, unlike moves such as 1...e5, 1...g6, or 1...Nc6, which either develop a minor piece or prepare to do so. In many variations of the Sicilian Black makes a number of further pawn moves in the opening (for example, ...d6, ...e6, ...a6, and ...b5). Consequently, White often obtains a substantial lead in development and dangerous attacking chances.

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