Blackmar-Diemer Gambit Accepted: Gunderam Defense, Stader Variation

An entry in the Encyclopedia of Chess Openings (ECO D00), reached after 14 half-moves: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 Bf5 6. Ne5 e6 7. g4 Be4.

Black rook — Use ← → arrows or click moves to step through.

Black knight — Use ← → arrows or click moves to step through.

End of this line

No further variations branch from this position in our database. To explore neighbouring ideas:

About this opening

Blackmar-Diemer Gambit Accepted: Gunderam Defense, Stader Variation 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 14 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 6. Ne5 e6 7. g4 Be4.

It belongs to the Blackmar-Diemer Gambit Accepted family. Within that family this is a level-2 branch (the Gunderam Defense → Stader Variation line). The immediate parent line is Blackmar-Diemer Gambit Accepted: Gunderam Defense, transitioned via 7…Be4.

The opening sequence in prose form: 1.d4 d5, 2.e4 dxe4, 3.Nc3 Nf6, 4.f3 exf3, 5.Nxf3 Bf5, 6.Ne5 e6. From this position the encyclopaedia records no further canonical continuations — practical play branches into unnamed transpositions or returns to the parent line for alternative ideas.