ECO family guide

Blackmar-Diemer Gambit Declined — all variations and ECO codes

9 named lines across 1 ECO code (D00). Source: the CC0-licensed lichess.org opening database.

The main line

Position after 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 c5 (D00). Open this line on Lichess → · Blackmar-Diemer Gambit Declined: Brombacher Countergambit on Lichess

How the main line scores at your rating

Real Lichess win rates for 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 c5, playing as black — the family's other variations are not separately tracked for win rate yet, main line only.

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Win/draw/loss rate by rating band
Rating band	Games	White / draw / Black	Score for black
1400-1600	5,454	43.2% / 3.6% / 53.1%	55.0%
1600-1800	8,838	41.9% / 3.7% / 54.4%	56.3%
1800-2000	16,025	44.3% / 4.7% / 51.0%	53.4%
2000+	32,382	45.9% / 6.2% / 48.0%	51.0%

All 9 named variations

Every named line in the Blackmar-Diemer Gambit Declined family, from the CC0-licensed ECO classification — not separately tracked for win rate, but every ECO code and move sequence is real, sourced data.

D00Brombacher Countergambit — 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 c5
D00Elbert Countergambit — 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 e5
D00Gedult Defense — 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 a6
D00Lamb Defense — 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 Nc6
D00Langeheinicke Defense — 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 e3
D00O'Kelly Defense — 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 c6
D00Vienna Defense — 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 Bf5
D00Weinsbach Defense — 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 e6
- D00Pfrang Gambit — 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 e6 5.fxe4