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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.
After 9.0-0 b4, White has the positional sacrifice 10.Nd5!, which gives Black long-term weaknesses and an open e-file for White to play on. Since then, it has been popular on all levels of play. Other sixth moves for White
The Sicilian Defence. 2. d4 cxd4 3. c3 dxc3. White's 3.c3 introduces the Smith–Morra Gambit. Black accepts the gambit pawn. 4. Nxc3 Nc6 5. Nf3 e6 6. Bc4 Qc7 7. 0-0 Nf6 8. Qe2. White prepares e4–e5. This move is playable if White is careful on the next move. After 8.Re1 Bc5 Black has a good game as White's f2-square is sensitive.
If Black is not careful, there is the risk of running unprepared into a highly theoretical opening, e.g. after 1.Nf3 c5 White can play 2.e4 leading to the mainline Sicilian Defense. Other common transpositions are to various lines of the Queen's Gambit Declined (after e.g. 1.Nf3 d5 2.d4 Nf6 3.c4) or the Catalan Opening (after e.g. 1.Nf3 Nf6 2 ...
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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.
White tries to break open the black kingside and deliver checkmate down the h-file, while Black seeks counterplay on the queenside with sacrificial attacks.Typical white strategies are exchanging dark squared bishops by Be3–h6, sacrificing a pawn and sometimes an exchange on h5, exploiting pressure on the a2–g8 diagonal, and the weakness of the d5-square.