Blackmar-Diemer Gambit Accepted: Gunderam Defense
1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 Bf5
The Blackmar-Diemer Gambit Accepted: Gunderam Defense is a chess opening classified as ECO D00, reached after 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 Bf5. It is a line of the Blackmar-Diemer Gambit Accepted. White is to move. 1 named line continues from this position.
In 12.6 million rated Lichess games (blitz and slower), this position was reached 240 times by this move order. White won 47%, 5% were drawn and Black won 48%. The most popular continuation is 6. Bc4 (35% of games).
Engine evaluation: −0.55 (Stockfish, depth 44; best line 6. Bd3 Bxd3 7. Qxd3 c6 8. Bg5 Nbd7)
- ECO
- D00
- Moves
- 10 plies
- FEN
rn1qkb1r/ppp1pppp/5n2/5b2/3P4/2N2N2/PPP3PP/R1BQKB1R w KQkq - 1 6- PGN
1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 Bf5
Analyse with Stockfish · Board image (SVG) · Open on Lichess
Results by rating
| Average rating | Games | White / draw / Black |
|---|---|---|
| 0-1499 | 56 | |
| 1500-1999 | 130 | |
| 2000+ | 54 | |
| All | 240 |
Most played moves
| Move | Games | White / draw / Black |
|---|---|---|
| 6. Bc4 | 84 (35%) | |
| 6. Bd3 | 42 (18%) | |
| 6. Ne5 | 41 (17%) | |
| 6. Be3 | 20 (8%) | |
| 6. h3 | 16 (7%) | |
| 6. Bg5 | 14 (6%) | |
| 6. Bb5+ | 7 (3%) | |
| 6. Be2 | 4 (2%) |
Master games
36 over-the-board games are classified under this line (White 47%, draw 14%, Black 39%). The strongest:
- Stockfish dev-20230409-b36d39d (3639) – LCZero 0.30-dag-a9b25c2b-BT2-3 (3598) 1/2-1/2 · TCEC 24 Superfinal 2023 · 2023-04-15
- LCZero 0.30-dag-a9b25c2b-BT2-3 (3598) – Stockfish dev-20230409-b36d39d (3639) 1/2-1/2 · TCEC 24 Superfinal 2023 · 2023-04-14
- Caissa 1.21.2 (3545) – Obsidian 14.06 (3555) 1/2-1/2 · TCEC 27 Premier 2024 · 2024-11-29
- Obsidian 14.06 (3555) – Caissa 1.21.2 (3545) 1/2-1/2 · TCEC 27 Premier 2024 · 2024-11-26
- IM Shamil Arslanov (2410) – GM Jeffery Xiong (2646) 0-1 · Titled Tue 23rd Jul Early · 2024-07-23
Search all games of the Blackmar-Diemer Gambit Accepted: Gunderam Defense and its sub-variations
Highest-rated Lichess games
- GolfeDuMorbihan (2681) – koonta (2572) 1-0 · 2026-09-02 · 180 + 0s
- Tsalko_vadim (2495) – ffl0 (2548) 0-1 · 2026-09-02 · 180 + 0s
- Kukoin (2427) – Moreno_Tejera (2579) 0-1 · 2026-09-06 · 180 + 2s
Comes from
Blackmar-Diemer Gambit Accepted 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3
Continuations
- Blackmar-Diemer Gambit Accepted: Gunderam Defense, Stader Variation D00 · 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 Bf5 6. Ne5 e6 7. g4 Be4
More Blackmar-Diemer Gambit Accepted lines (all)
- Blackmar-Diemer Gambit Accepted: Bogoljubow Defense D00
- Blackmar-Diemer Gambit Accepted: Bogoljubow Defense, Kloss Attack D00
- Blackmar-Diemer Gambit Accepted: Bogoljubow Defense, Mad Dog Attack D00
- Blackmar-Diemer Gambit Accepted: Bogoljubow Defense, Nimzowitsch Attack D00
- Blackmar-Diemer Gambit Accepted: Bogoljubow Defense, Studier Attack D00
- Blackmar-Diemer Gambit Accepted: Euwe Defense D00
- Blackmar-Diemer Gambit Accepted: Euwe Defense, Duthilleul Gambit D00
- Blackmar-Diemer Gambit Accepted: Euwe Defense, Zilbermints Gambit D00
- Blackmar-Diemer Gambit Accepted: Holwell Defense D00
- Blackmar-Diemer Gambit Accepted: Kaulich Defense D00
- Blackmar-Diemer Gambit Accepted: Pietrowsky Defense D00
- Blackmar-Diemer Gambit Accepted: Ritter Defense D00
Opening names and moves from the Lichess openings dataset; statistics from the Lichess open database, 2026-09 (CC0), sample of 12.6 million games, bots excluded; evaluations from Lichess cloud analysis (all CC0). Master games from The Week in Chess #920–#1664 by Mark Crowther, used with permission.