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1.Nc3 d5 2.f4 d4 3.Ne4 e5 4.Nf3 · ECO A00
Van Geet Opening: Pfeiffer Gambit, Sleipnir Countergambit is a chess opening that arises after 1.Nc3 d5 2.f4 d4 3.Ne4 e5 4.Nf3. It is classified A00 in the ECO system, and the position after these moves has black to move.
This line is a variation within the Van Geet Opening family. The strategic ideas above describe the family as a whole; this particular line reaches them by the move order 1.Nc3 d5 2.f4 d4 3.Ne4 e5 4.Nf3.