Chess Tips : Opening Trap in Ruy Lopez (For Black) | Berlin Defence

About Ruy Lopez:
The Ruy Lopez also called the Spanish Opening or Spanish Game, is a chess opening characterised by the moves:

1. e4 e5
2. Nf3 Nc6
3. Bb5


It is one of the most popular openings, with many variations.
In the Encyclopaedia of Chess Openings (ECO), all codes from C60 to C99 are assigned to the Ruy Lopez.

About Ruy Lopez:Berlin Defence
The Berlin Defence, also called the Berlin Wall, is a chess opening that begins with the moves:

1.e4 e5
2.Nf3 Nc6
3.Bb5 Nf6

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 (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).

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