Ruy Lopez: Cozio Defense

An entry in the Encyclopedia of Chess Openings (ECO C60), reached after 6 half-moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nge7.

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4.d4 1 line
- C60 Tartakower Gambit
4.Nc3 1 line
- C60 Paulsen Variation

About this opening

Ruy Lopez: Cozio Defense is an opening in the Encyclopedia of Chess Openings, classified under code C60. ECO group C (C00–C99) covers open games (1.e4 e5) and the French Defence, including the Ruy Lopez, Italian, Scotch and King's Gambit. This particular variation is reached after 6 half-moves from the starting position, with the move sequence 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nge7.

It belongs to the Ruy Lopez family. Within that family this is a sub-variation (the Cozio Defense line).

The opening sequence in prose form: 1.e4 e5, 2.Nf3 Nc6, 3.Bb5 Nge7. From this position 2 named continuations are recorded in the encyclopaedia, each leading to a distinct theoretical line.