Dunno, but 6 Nxd4 exd4 7 Qh5+ is unnecessarily sharp. Simply 6 Ba4 is better.
Thanks for the reply, I was actually just looking at 6) Ba4 which Junior Tay recommends in his book based on 6.. Nf6, but I found my old 1991 Mikhail Tseitlin book (page 68) to which on Ba4, he mentions 6..Qf6! for black with play as follows:
7) 0-0 d6
8) Re1 Nxf3
9) Qxf3 Kd8 =
An opening which has been fascinating me for a while is the Schliemann defense played in the Ruy Lopez or Spanish opening. Playing directly for the initiative with this aggressive opening by opening the f-file and attacking the kingside. It can also be used as a surprise weapon against your unknowing opponent! The opening goes as following:
After this, white has a numerous options like 4.exf5, 4.d3 or maybe 4.d4!? but developing with 4.Nc3 is considered best, as it develops a piece and supports the e4 pawn.
Below a wonderful game played by Pillsbury against Tarrasch:
I would like to conclude this article with my own game where I was playing with the black pieces: