Tabiya: Scots Four Knights

Kaufman puts the Scots and Four Knights in one chapter, because of the likely transpositions to this line:
1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Nf6 5.Nc3 (Scots)
1.e5 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.d4 exd4 5.Nxd4 (Four Knights)

BTW, I call it Scots rather than Scotch, because Scots refers to things from Scotland, and Scotch is a beverage.

The mainline of the Scots follows from 5.Nxc6 and will require other Tabiya.

1.e5 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.d4 exd4 5.Nxd4 Bb4 6.Nxc6 bxc6 7.Bd3 d5 8.exd5 cxd5 9.O-O O-O 10.Bg5 c6:

11.Qf3 is likely white's best next move, though Na4 and Ne2 are also played. This is exactly the type of open game position I need to understand better. Black's kingside pawn structure might be wrecked, but white will have to give up the queen to do it. Black must get more active piece play to offset his bad pawns.

After 11.Qf3, Bd6 is balanced move, Be7 tries to avoid the bad kingside pawns, while h6 provokes the bad pawns, but will likely get a bishops of opposite color endgame.