Philidor Defense: Nimzowitsch Variation, Klein Variation

1.e4 e5 2.Nf3 d6 3.d4 Nf6 4.Bc4

ECO C41

The Philidor Defense: Nimzowitsch Variation, Klein Variation is a chess opening line in the Philidor Defense complex, reached after 1.e4 e5 2.Nf3 d6 3.d4 Nf6 4.Bc4.

It is catalogued under code C41 in the Encyclopaedia of Chess Openings (ECO).

The defining move Bc4 is chosen by White on move 4.

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.