The Sicilian Defense

Keres Attack (B81)

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The Keres Attack (B81) is considered the most dangerous attack available
to white when Black plays for the Scheveningen pawn structure in the
Sicilian Defense. This variation for white is named after GM Paul Keres
who championed the move 6.g4 after reaching the set-up: 1. e4 c5 2. Nf3
d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6

The attacking move 6. g4 is made possible by the fact that Black has cut
off his white bishop from the g4 square when he made the advance e6.
White’s intention with this move is to make the push g5 and force
Black’s knight to retreat. Black is able to adequately defend his
position with the pawn move 6. … h6. While, this is a defensible
position for black some may try to avoid the g4 thrust by waiting on e6
and playing 5. … a6. This is a natural move in the Sicilian Defense as
it begins the queenside pawn storm as well as taking away b5 as an
outpost for white knights.