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If Nd1, there's Rf3 blocking the check. Remember black pawns are moving down the board, so g4 covers f3. Ra7 is necessary to lure the rook away, so that Nd1 would be mate.

there's no space between 9...Qd7 and move 10. Add a space and it should fix it.

I think the problem is that the lichess database doesn't include games that are 4 moves long (which is why it seems like Qxf7 has never been played).

Prophylaxis is not always a good thing, and this is especially true when attacking. Sometimes, you just have to get there before the opponent either has a chance to generate counterplay or bolster his…