About this opening
Ruy Lopez: Berlin Defense, Closed Showalter Variation is an opening in the Encyclopedia of Chess Openings,
classified under code C66. 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 13 half-moves from the
starting position, with the move sequence 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O d6 5. d4 Bd7 6. Nc3 Be7 7. Bxc6.
It belongs to the Ruy Lopez family.
Within that family this is a level-2 branch (the Berlin Defense → Closed Showalter Variation line). The immediate parent line is Ruy Lopez: Berlin Defense, transitioned via 7.Bxc6.
The opening sequence in prose form: 1.e4 e5, 2.Nf3 Nc6, 3.Bb5 Nf6, 4.O-O d6, 5.d4 Bd7, 6.Nc3 Be7. From this position the encyclopaedia records no further canonical continuations — practical play branches into unnamed transpositions or returns to the parent line for alternative ideas.