The Keene Defense, Main Line is a variation of the Grob Opening, catalogued as ECO A00. The line runs 1. g4 d5 2. h3 e5 3. Bg2 c6 4. d4 e4 5. c4 Bd6 6. Nc3 Ne7, reaching the position shown below after 12 half-moves.
Both sides have pawns in the centre (White on d4, Black on d5 and e4), and one pawn capture is available, so the structure has not settled yet. Development is level at two minor pieces each. It is White to move after six moves.
On the Grob Opening generally: An unorthodox opening starting with 1.g4. Risky but can catch opponents off guard.
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The Keene Defense, Main Line goes 1. g4 d5 2. h3 e5 3. Bg2 c6 4. d4 e4 5. c4 Bd6 6. Nc3 Ne7. It is a variation of the Grob Opening and is catalogued as ECO A00.
The Keene Defense, Main Line is ECO A00. ECO codes group openings by their move order, so nearby codes cover closely related lines of the Grob Opening.
Stockfish evaluates the position after 1. g4 d5 2. h3 e5 3. Bg2 c6 4. d4 e4 5. c4 Bd6 6. Nc3 Ne7 at -1.12 at depth 18, which is a small but real edge for Black. Engine evaluation is only a starting point — at club level the practical value of a line is mostly about whether you know its plans better than your opponent does.
Both sides have pawns in the centre (White on d4, Black on d5 and e4), and one pawn capture is available, so the structure has not settled yet. Development is level at two minor pieces each. It is White to move.