Nimzowitsch Defense: Colorado Countergambit Accepted

1.e4 Nc6 2.Nf3 f5 3.exf5

ECO B00

The Nimzowitsch Defense: Colorado Countergambit Accepted is a chess opening line in the Nimzowitsch Defense complex, reached after 1.e4 Nc6 2.Nf3 f5 3.exf5.

It is catalogued under code B00 in the Encyclopaedia of Chess Openings (ECO).

The defining move exf5 is chosen by White on move 3.

The Nimzowitsch Defense: Colorado Countergambit Accepted is a line of the Nimzowitsch Defense. The Nimzowitsch Defense is a chess opening that begins 1.e4 Nc6. Read the complete Nimzowitsch Defense guide: what it is, how to reach it, its main variations, how to play against it, and its history.

More ECO B00 openings

• Barnes Defense — 1.e4
• Borg Defense — 1.e4
• Carr Defense — 1.e4
• Duras Gambit — 1.e4
• Fried Fox Defense — 1.e4
• Goldsmith Defense — 1.e4

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.