Library/Openings/Blackmar-Diemer Gambit/Lemberger Countergambit/Rasmussen Attack ECO D00
Opening· 7 plies

Blackmar-Diemer Gambit: Lemberger Countergambit, Rasmussen Attack

An entry in the Encyclopedia of Chess Openings (ECO D00), reached after 7 half-moves: 1. d4 d5 2. e4 dxe4 3. Nc3 e5 4. Nge2.

Blackmar-Diemer Gambit: Lemberger Countergambit, Rasmussen Attack ECO D00
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Black rook
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White pawn
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End of this line

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About this opening

Blackmar-Diemer Gambit: Lemberger Countergambit, Rasmussen Attack 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 7 half-moves from the starting position, with the move sequence 1. d4 d5 2. e4 dxe4 3. Nc3 e5 4. Nge2.

It belongs to the Blackmar-Diemer Gambit family. Within that family this is a level-2 branch (the Lemberger Countergambit → Rasmussen Attack line). The immediate parent line is Blackmar-Diemer Gambit: Lemberger Countergambit, transitioned via 4.Nge2.

The opening sequence in prose form: 1.d4 d5, 2.e4 dxe4, 3.Nc3 e5, 4.Nge2. 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.