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The Berlin Defence, also called the Berlin Wall, is a chess opening that begins with the moves:
The opening is a variation of the Ruy Lopez and is assigned codes C65-C67 in the Encyclopaedia of Chess Openings. The code C65 covers White moves other than 4.0-0, such as 4.d3. The code C66 covers the variation 4.0-0 d6, and the code C67 covers the variation 4.0-0 Nxe4.
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