Black Knight opens the Queens file d - the Queens are now standing face to face. To keep the balance, the White Queen has to attack the Black Queen. If she does not, the Black Queen will capture her. --- Ruy Lopez or Spanish Opening, see https://en.wikipedia.org/wiki/Ruy_Lopez with the Berlin Defense, see https://en.wikipedia.org/wiki/Ruy_Lopez#Berlin_Defence, sometimes called 'The Berlin Wall'. The displayed moves are marked '>>'. 1 white E2-E4 Classic opening with the white Kings Pawn >> black E7-E5 Classic answer with the black Kings Pawn -> Chess in the Park: First Move 2 white N G1-F3 White Queens Knight attacks Black Pawn >> black N B8-C6 Black Queens Knight moves to defend Black Pawn -> Chess in the Park: Second Move 3 >> white B F1-B5 White Kings Bishop running ('Läufer' in German!) into attack position on Black Knight >> black N G8-F6 Black Kings Knight comes out to attack White Pawn 4 white K E1-G1 0-0 Castling >> black N F6xE4 White Pawn is captured by Black Knight 5 >> white D2-D4 Another White Pawn moves and attacks the Black Pawn >> black N E4-D6 Black Knight draws back 6 >> white B B5xC6 White Bishop captures Black Knight, Black Pawn is not longer covered >> black D7xC6 Black Pawn captures White Bishop 7 >> white D4xE5 White Pawn captures Black Pawn >> black N D6-F5 Black Knight opens a path to the Black Queen