Sharp line in the Philidor
In the 8.g3 Nxg3 line, White plays 9.Nf3! and black is busted.
This. Which is trouble, since g3 has got to be the first option 99% of people are going to look at.
That's correct. I hallucianted that the 9...Nxh1 discovered check would have to be answered by a king move, when in reality the checking piece (the queen) would be captured.