Sicilian Defense: Najdorf Variation, Opocensky Variation

Key moves: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6

The Najdorf Variation is perhaps the most theoretically important chess opening. The move 6...a6 is a multi-purpose prophylactic move that controls b5, prepares ...e5, and keeps maximum flexibility. It leads to extraordinarily complex positions.

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