Chess Opening Theory/1. e4/1...Nc6/2. d4/2...d5/3. Nc3/3...dxe4/4. d5

= Nimzowitsch Defence = Black now faces the choice of where to retreat his knight. /4...Ne5/ is the main line, but /4...Nb8/ is an interesting alternative.

Theory table
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'''1. e4 Nc6 2. d4 d5 3. Nc3 dxe4 4. d5'''