Mistake #1: 3..., d5 is book. This gives more initiative to White.
4. e5 Qd8e7 5. Qd1e2 Nf6g8 6. Ng1f3 Nb8c6
This LOOKS like logical development, but Black needs to defuse the intended Nd5. 6..., Qd8 works much better, although White's lead in development is already evident.
7. d4 d6
? Now comes the violent punishment for Black's negligence of development.
8. Nc3d5 Qe7d7
?? 8. ..., Qd8 was less disastrous, but Black is probably totally lost anyway.
9. exd6 Ke8d8
?? The last mistake permitted. Black should simply cede a piece.
