Blackmar-Diemer Gambit Declined: O'Kelly Defense
1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 c6
The Blackmar-Diemer Gambit Declined: O'Kelly Defense is a chess opening classified as ECO D00, reached after 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 c6. It is a line of the Blackmar-Diemer Gambit Declined. White is to move.
In 12.6 million rated Lichess games (blitz and slower), this position was reached 26 times by this move order. White won 27%, 11% were drawn and Black won 62%. The most popular continuation is 5. fxe4 (77% of games).
Engine evaluation: −0.12 (Stockfish, depth 38; best line 5. Nxe4 Nbd7 6. Nxf6+ Nxf6 7. c3 Bd7)
- ECO
- D00
- Moves
- 8 plies
- FEN
rnbqkb1r/pp2pppp/2p2n2/8/3Pp3/2N2P2/PPP3PP/R1BQKBNR w KQkq - 0 5- PGN
1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 c6
Analyse with Stockfish · Board image (SVG) · Open on Lichess
Results by rating
| Average rating | Games | White / draw / Black |
|---|---|---|
| 0-1499 | 2 | |
| 1500-1999 | 14 | |
| 2000+ | 10 | |
| All | 26 |
Most played moves
| Move | Games | White / draw / Black |
|---|---|---|
| 5. fxe4 | 20 (77%) | |
| 5. Bg5 | 3 (12%) | |
| 5. Bc4 | 3 (12%) |
Master games
12 over-the-board games are classified under this line (White 17%, draw 25%, Black 58%). The strongest:
- IM Juan Mellado Trivino (2442) – GM Javier B. Campos Moreno (2422) 1/2-1/2 · 16th Miquel Mas Open 2015 · 2015-08-16
- IM Shamil Arslanov (2410) – FM Jonas Wyss (2283) 1-0 · Titled Tue 18th Mar Early · 2025-03-18
- IM Shamil Arslanov (2410) – FM Artem Odegov (2244) 0-1 · Titled Tue 17th Jun Early · 2025-06-17
- CM Rustem Gorbenko (2219) – IM Eric Rosen (2377) 0-1 · 2nd 3-0 Thu 1st Jan 2026 · 2026-01-01
- Pierre-Louis Pieri (2203) – IM Eric Rosen (2377) 0-1 · Titled Tue 25th Mar Late · 2025-03-25
Search all games of the Blackmar-Diemer Gambit Declined: O'Kelly Defense and its sub-variations
Highest-rated Lichess games
- Noddy2001 (2433) – DrG2020 (2403) 0-1 · 2026-09-02 · 300 + 0s
- OzzY666 (2282) – LTop (2366) 0-1 · 2026-09-03 · 180 + 0s
- broncowideswinger (2250) – SuleimanovBulat (2243) 1-0 · 2026-09-05 · 180 + 0s
Comes from
Blackmar-Diemer Gambit (3. Nc3 Nf6) 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6
More Blackmar-Diemer Gambit Declined lines (all)
- Blackmar-Diemer Gambit Declined: Brombacher Countergambit D00
- Blackmar-Diemer Gambit Declined: Elbert Countergambit D00
- Blackmar-Diemer Gambit Declined: Gedult Defense D00
- Blackmar-Diemer Gambit Declined: Lamb Defense D00
- Blackmar-Diemer Gambit Declined: Langeheinicke Defense D00
- Blackmar-Diemer Gambit Declined: Vienna Defense D00
- Blackmar-Diemer Gambit Declined: Weinsbach Defense D00
- Blackmar-Diemer Gambit Declined: Weinsbach Defense, Pfrang Gambit 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.