ECO code: B28
Opening Name: Sicilian Defense: O'Kelly Variation, Yerevan System
Moves: 1. e4 c5 2. Nf3 a6 3. Nc3
Description: The O'Kelly Variation in the Sicilian Defense is characterized by Black's early ...a6 move on the second move. This move is somewhat unusual compared to the more common ...d6 or ...Nc6 and serves to prevent White's pieces, particularly the knight or bishop, from using the b5-square. It also prepares for a possible ...b5 expansion on the queenside, aiming to gain space and challenge White's control there.
Characteristics: The key feature of Black's 2...a6 is its flexibility and prophylactic nature. It is less about immediate central confrontation and more about controlling the queenside and limiting White's typical Sicilian attacking motifs involving Nb5 or Bb5+. As a result, Black adopts a somewhat patient, strategic stance.
Attacking or Defensive: From Black's perspective, this variation is more positional and somewhat defensive initially, focusing on controlling key squares and preventing White's active plans rather than immediate counterattack. White, on the other hand, tends to maintain an attacking posture by developing naturally and aiming to establish strong central control with pawns and pieces.
Center Control: This variation does not directly contest the center with an immediate pawn thrust but allows White to build a strong presence there. Black's focus is on queenside expansion and piece placement, so while White attacks the center actively, Black prepares counterplay on the flanks.
This opening is defined by the position shown on the board below. The moves displayed are a typical sequence that leads to it, but different sequences can reach the same position and still carry the same opening name.
Practice puzzles and train your tactics with real positions from games that used the Sicilian Defense: O'Kelly Variation, Yerevan System, and sharpen your opening mastery.
Puzzle 1 of 5 - Move #8 black