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Any good references (books/videos/tutorials) for this variation?
1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nf6 5.Nxf6+ gxf6
If you read Danish there's Bent Larsen's Solide åbninger (Solid openings) from 1980.
It is a repertoire book for beginners (white and black) and suggests the line you inquire about as the defense against 1. e4.
Required, but never shown