English Opening: Agincourt Defense, Tarrasch Defense

An entry in the Encyclopedia of Chess Openings (ECO A13), reached after 12 half-moves: 1. c4 e6 2. Nf3 d5 3. g3 Nf6 4. Bg2 c5 5. b3 Nc6 6. O-O Be7.

Black rook — Use ← → arrows or click moves to step through.

Black bishop — Use ← → arrows or click moves to step through.

End of this line

No further variations branch from this position in our database. To explore neighbouring ideas:

About this opening

English Opening: Agincourt Defense, Tarrasch 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 12 half-moves from the starting position, with the move sequence 1. c4 e6 2. Nf3 d5 3. g3 Nf6 4. Bg2 c5 5. b3 Nc6 6. O-O Be7.

It belongs to the English Opening family. Within that family this is a level-2 branch (the Agincourt Defense → Tarrasch Defense line). The immediate parent line is English Opening: Agincourt Defense, transitioned via 6…Be7.

The opening sequence in prose form: 1.c4 e6, 2.Nf3 d5, 3.g3 Nf6, 4.Bg2 c5, 5.b3 Nc6, 6.O-O Be7. 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.