Blackmar-Diemer Gambit Accepted: Gunderam Defense

An entry in the Encyclopedia of Chess Openings (ECO D00), reached after 10 half-moves: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 Bf5.

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6.Ne5 1 line
- D00 Stader Variation

About this opening

Blackmar-Diemer Gambit Accepted: Gunderam Defense is an opening in the Encyclopedia of Chess Openings, classified under code D00. ECO group D (D00–D99) covers closed games and semi-closed games beginning 1.d4 d5, covering the Queen's Gambit, Slav, Grünfeld and related queen-pawn structures. This particular variation is reached after 10 half-moves from the starting position, with the move sequence 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 Bf5.

It belongs to the Blackmar-Diemer Gambit Accepted family. Within that family this is a sub-variation (the Gunderam Defense line).

The opening sequence in prose form: 1.d4 d5, 2.e4 dxe4, 3.Nc3 Nf6, 4.f3 exf3, 5.Nxf3 Bf5. From this position exactly one named continuation is recorded in the encyclopaedia.