It is definately playable against the scotch. As a scotch player myself, I can say that's the least seen mainline, but I still know what to play against it. Generally it continues 5.Nc3 Bb4 6.Be2 Qxe4 7.Nb5 Bxc3+ 8.bxc3 Kd8 9.0-0 where black has a pawn advantage, but white has developed pieces and black has an awkwardly placed king. I'll play an unrated game against you if you wish.
Scotch 4...Qh4

Hi Conquiscador - I think you will find that you will do well with this line...especially if white is new to this position.... the more theory white knows the better white does relative to black....but you can win a lot of games up to this point ...rest assured it is a main line so it is sound...
It is sound, sort of... if white has done his/her homework black has a tough road ahead; an awkwardly placed king, slightly discoordinated pieces, but s/he will also have a pawn for these troubles.
I was wondering if any scotch players can help me with the theory of this variation. It is difficult to find theory on this variation.
I want to use it as my main weapon against the scotch. Is it playable as black?
I would be most appreciative.