Indian Defense: Gibbins-Weidenhagen Gambit, Oshima Defense

An entry in the Encyclopedia of Chess Openings (ECO A45), reached after 4 half-moves: 1. d4 Nf6 2. g4 e5.

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

Black knight — 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

Indian Defense: Gibbins-Weidenhagen Gambit, Oshima Defense is an opening in the Encyclopedia of Chess Openings, classified under code A45. ECO group A (A00–A99) covers flank and irregular openings, including the English, Bird, Réti and Dutch defences. This particular variation is reached after 4 half-moves from the starting position, with the move sequence 1. d4 Nf6 2. g4 e5.

It belongs to the Indian Defense family. Within that family this is a level-2 branch (the Gibbins-Weidenhagen Gambit → Oshima Defense line). The immediate parent line is Indian Defense: Gibbins-Weidenhagen Gambit, transitioned via 2…e5.

The opening sequence in prose form: 1.d4 Nf6, 2.g4 e5. 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.