Borg Defense

1.e4 g5

ECO B00

The Borg Defense is a chess opening reached after 1.e4 g5, catalogued under code B00 in the Encyclopaedia of Chess Openings (ECO).

The defining move g5 is chosen by Black on move 1.

3 named continuations branch from this position, including the Borg Gambit and the Troon Gambit.

Named variations

• Borg Defense: Borg Gambit — ECO A40
• Borg Defense: Troon Gambit — ECO B00
• Borg Defense: Zilbermints Gambit — ECO B00

Do you want to learn openings?

Start with a GM-authored repertoire you study move by move, then practice against a human-like AI opponent:

• Catalan Opening
• King's Indian Defense with ...e5

Every chess term used here is defined in the chess terms glossary. Browse all opening courses or the full ECO code index.