Sicilian Defense Sheveningen System | Tutorial by GM Marian Petrov | CHESS KLUB

In the Scheveningen Variation, Black is content to place the e-pawn on e6, where it guards the d5-square, rather than play the space-gaining ...e5. Moving the e-pawn also prepares ...Be7 followed by kingside castling. In view of this, Paul Keres introduced 6.g4, the Keres Attack, in 1943. White intends to drive away the black knight with g5.
If Black prevents this with 6...h6, which is the most common answer, White has gained kingside space and discouraged Black from castling on that side, and may later play Bg2. If the complications after 6.g4 are not to White's taste, a major alternative is 6.Be2, a typical line being 6...a6 (this position can be reached from the Najdorf via 5...a6 6.Be2 e6) 7.0-0 Be7 8.f4 0-0. 6.Be3 and 6.f4 are also common.
While theory indicates that Black can hold the balance in the Keres Attack, players today often prefer to avoid it by playing 5...a6 first, an idea popularized by Kasparov.
In that case white can choose any of the main lines from the Najdorf variation.
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