Library/Openings/English Opening/Agincourt Defense/Bogoljubow Defense ECO A13
Opening· 8 plies

English Opening: Agincourt Defense, Bogoljubow Defense

An entry in the Encyclopedia of Chess Openings (ECO A13), reached after 8 half-moves: 1. c4 e6 2. Nf3 d5 3. g3 Nf6 4. Bg2 Bd6.

English Opening: Agincourt Defense, Bogoljubow Defense ECO A13
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Black rook
Black knight
Black bishop
Black queen
Black king
Black rook
Black pawn
Black pawn
Black pawn
Black pawn
Black pawn
Black pawn
Black bishop
Black pawn
Black knight
Black pawn
White pawn
White knight
White pawn
White pawn
White pawn
White pawn
White pawn
White pawn
White bishop
White pawn
White rook
White knight
White bishop
White queen
White king
White rook
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End of this line

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About this opening

English Opening: Agincourt Defense, Bogoljubow Defense is an opening in the Encyclopedia of Chess Openings, classified under code A13. ECO group A (A00–A99) covers flank and irregular openings, including the English, Bird, Réti and Dutch defences. This particular variation is reached after 8 half-moves from the starting position, with the move sequence 1. c4 e6 2. Nf3 d5 3. g3 Nf6 4. Bg2 Bd6.

It belongs to the English Opening family. Within that family this is a level-2 branch (the Agincourt Defense → Bogoljubow Defense line). The immediate parent line is English Opening: Agincourt Defense, transitioned via 4…Bd6.

The opening sequence in prose form: 1.c4 e6, 2.Nf3 d5, 3.g3 Nf6, 4.Bg2 Bd6. From this position the encyclopaedia records no further canonical continuations — practical play branches into unnamed transpositions or returns to the parent line for alternative ideas.