Tree path 4 levels Queen's Pawn Game › Blackmar-Diemer Gambit › Blackmar-Diemer Gambit › Blackmar-Diemer Gambit Declined: O'Kelly Defense
- Caissa Codex
- Queen's Pawn Game D00
- Blackmar-Diemer Gambit D00
- Blackmar-Diemer Gambit D00
- Blackmar-Diemer Gambit Declined: O'Kelly Defense D00 you are here
Blackmar-Diemer Gambit Declined: O'Kelly Defense
Overview
Blackmar-Diemer Gambit Declined: O'Kelly Defense is a gambit, classified under ECO code D00 within the Closed & Semi-Closed Games family. As with all gambits, one side sacrifices material early — usually a pawn — in exchange for development, open lines, or initiative.
The Closed & Semi-Closed Games group covers closed and semi-closed games — 1.d4 systems characterised by long strategic manoeuvring rather than early tactics.
The line arises from 8 plies — specifically the moves 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 c6.
It is a variation of Blackmar-Diemer Gambit, which itself descends from the root opening Queen's Pawn Game.
Step through the moves on the interactive board below, review the live Lichess statistics, or play this position against Stockfish at one of six difficulty levels.
- ECO code
- D00
- Group
- Closed & Semi-Closed Games (D)
- Plies
- 8
- Parent
- Blackmar-Diemer Gambit
This overview is generated automatically from the opening's metadata. Know this line well? Write a description — submissions are reviewed before publishing.
Statistics from Lichess
242,417 games · White 51.7% / Draw 4.5% / Black 43.8%
| Moves | Games | W / D / B |
|---|---|---|
| fxe4 | 184,841 | |
| Bc4 | 22,915 | |
| Bg5 | 16,320 | |
| Be3 | 10,428 | |
| Nxe4 | 3,924 | |
| Bf4 | 2,097 | |
| a3 | 662 | |
| h3 | 566 |
Source: Lichess Opening Explorer · cached 2026-09-26 01:54:36
Write a description
Markdown supported (headings ###, bold, lists, links).
Submissions are reviewed before publishing.