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The Sodium Attack (Durkin vs McCormick, 1948)
1. Na3
Na is the chemical symbol for Sodium - so the Na3 opening is hence call ed the Sodium Attack. First notably played by Robert Durkin.
A reactive play that cedes white's momentum, the Sodium attack has been used several times recently by Carlsen and Veselin. In fact, Veselin played it against Carlsen in 2009 which led to a draw.