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Please note that this can lead to offering the d4 pawn but White gets compensation.
Second repertoire is centered around the main line 3 Nc3
and the key position after 6 Bc4 is here :
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While this is the main line, I suggest alternatives later on to seize the initative
to replay all variations, the link is here
http://view.chessbase.com/cbreader/2018/8/24/Game28093718.html