How do you get to this trap position? [FEN "rn1qkbnr/ppp1pppp/8/8/2B3b1/2N2N2/PPPP1PPP/R1BQK2R b KQkq - 0 1"]

1...Nf6 2.Bxf7+ Kxf7 3.Ne5+ Kg8 4.Nxg4


It's black to move. There is a trap: 1...Nf6 2.Bxf7+ Kxf7 3.Ne5+ Kg8 4.Nxg4 and white wins a pawn (from Capablanca's Chess Fundamentals). I wonder how do you get to the initial position. The only way I've thought of involves black playing a bad opening, moving a piece twice. For instance:

[FEN " w KQkq - 0 1"]

1.e4 d5 2.exd5 Qxd5 3.Nc3 Qd8 4.Nf3 Bg4 5.Bc4


Is there a more natural way to get to the position?
Your proposal is a plausible way to get to that position. I wouldn't call the Scandinavian "bad" just because it moves a piece twice. It's perfectly playable.

When the trap was played in the following game, it was the knight rather than the queen which moved twice.

[Site "Sao Paulo (Brazil)"]
[Date "1973.??.??"]
[White "Nobrega Adaucto Da "]
[Black "Barata Hemar"]
[Result "1-0"]
[FEN ""]

1. e4 d5 2. exd5 Nf6 3. Nc3 Nxd5 4. Bc4 Nf6 5. Nf3 Bg4 6. Bxf7+ Kxf7 7. Ne5+ Kg8
8. Nxg4


And by the way, you have to be a little careful when playing this. Someone once tried this on me, but the position was slightly different:

[FEN ""]

1.e4 d5 2.exd5 Qxd5 3.Nc3 Qa5 4.d4 c6 5.Nf3 Nf6 6.Bc4 Bg4 D 7.Bxf7+?


And now after Kxf7 8.Ne5+, Black has Qxe5+ 9.dxe5 Bxd1 and will end up with an extra minor piece.