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Chess Opening Theory/1. e4/1...c5/2. Nf3/2...d6/3. d4/3...cxd4/4. Nxd4/4...Nf6/5. Nc3/5...a6/6. Be3/6...e6

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Sicilian Defence, Scheveningen Variation
a b c d e f g h
8a8 black rookb8 black knightc8 black bishopd8 black queene8 black kingf8 black bishopg8 black kingh8 black rook8
7a7 black kingb7 black pawnc7 black kingd7 black kinge7 black kingf7 black pawng7 black pawnh7 black pawn7
6a6 black pawnb6 black kingc6 black kingd6 black pawne6 black pawnf6 black knightg6 black kingh6 black king6
5a5 black kingb5 black kingc5 black kingd5 black kinge5 black kingf5 black kingg5 black kingh5 black king5
4a4 black kingb4 black kingc4 black kingd4 white knighte4 white pawnf4 black kingg4 black kingh4 black king4
3a3 black kingb3 black kingc3 white knightd3 black kinge3 white bishopf3 black kingg3 black kingh3 black king3
2a2 white pawnb2 white pawnc2 white pawnd2 black kinge2 black kingf2 white pawng2 white pawnh2 white pawn2
1a1 white rookb1 black kingc1 black kingd1 white queene1 white kingf1 white bishopg1 black kingh1 white rook1
a b c d e f g h
Position in Forsyth-Edwards Notation (FEN)

rnbqkb1r/1p3ppp/p2ppn2/8/3NP3/2N1B3/PPP2PPP/R2QKB1R w

Moves: 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 e6

Sicilian Defence, Scheveningen Variation

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This move order is a common transpositional tool for Scheveningen players to avoid the Keres Attack, which is reached from 6.g4 from a standard Scheveningen position. While it initially follows the Najdorf move order, the e6 push is more characteristic of the Scheveningen than the Najdorf, where black often plays a direct e7-e5 push.

Note that here, white can choose to follow up with 7. g4, but this line is referred to as the Perenyi Attack rather than the Keres Attack. This is because now that a6 controls the b5 square, black can play 7...e5 without fear of 8.Bb5+. Normally, in the Keres Attack, that would result in a trade of light squared bishops. But in this case, black now has two attackers on the exposed g4 pawn, where there is only one defender, the white queen. Further, 7...e5 threatens the d4 knight, so simply moving 8.h3 to protect the g pawn drops the knight. White's move, therefore, in the mainline Perenyi Attack, is 8.Nf5, cutting off the bishop's assault on g4 while moving the knight to temporary safety.

White can also play the move 7.f3, following the normal English attack plan of castling queenside. The main line is 7...b5 8. Qd2 Nbd7 9.0-0-0 Bb7 10.a3. This is a very sharp line where White wants to attack on the kingside and keep his control of the center, and Black wants to attack on the queenside and break White's central control. The plans usually revolve around White pushing g4 favorably and Black pushing d5 favorably. Whoever does that first without making large concessions is usually better.

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References

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Wikipedia has related information at Sicilian Defence, Scheveningen Variation

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