Arctic Defense, Drunken Knight Variation

Black routes the king's knight through h6 to f7 after 2. e4 Nh6 3. d4 Nf7, because the f-pawn already occupies f6. On f7 the knight covers e5 and g5, but it blocks the f-file and stands far from the center, while White has set up pawns on d4 and e4. The engine gives White a clear advantage, though online results are nearly level. The usual continuations are 4. Nc3, 4. Bc4 and 4. e5.