Bức tường Beclin , khai cuộc Tây Ban Nha.
The Berlin Defence 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.[1] The code C65 covers White moves other than 4.0-0, such as 4.d3 (4.Nc3 is considered a variation of the Four Knights Game). The code C66 covers the variation 4.0-0 d6, and the code C67 covers the variation 4.0-0 Nxe4 (usually regarded as the main line of the Berlin Defence).[2]
