Ruy Lopez: Berlin Defense, l'Hermet Variation

An entry in the Encyclopedia of Chess Openings (ECO C67), reached after 10 half-moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 Nd6.

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6.Bxc6 2 lines
- C67 Berlin Wall Defense
- C67 Westerinen Line

About this opening

Ruy Lopez: Berlin Defense, l'Hermet Variation is an opening in the Encyclopedia of Chess Openings, classified under code C67. 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 10 half-moves from the starting position, with the move sequence 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 Nd6.

It belongs to the Ruy Lopez family. Within that family this is a level-2 branch (the Berlin Defense → l'Hermet Variation line). The immediate parent line is Ruy Lopez: Berlin Defense, transitioned via 5…Nd6.

The opening sequence in prose form: 1.e4 e5, 2.Nf3 Nc6, 3.Bb5 Nf6, 4.O-O Nxe4, 5.d4 Nd6. From this position exactly one named continuation is recorded in the encyclopaedia.