You didn't see that taking the Rook meant forced mate?
10. Kd1 Nxa1
11. Re1+ Kd7
12. Qxd5+
You have only one legal move, Bd6.
10. Kd1 Nxa1
11. Re1+ Kd7
12. Qxd5+ Bd6
13. Qf5+
You have only one legal move, Kc6.
10. Kd1 Nxa1
11. Re1+ Kd7
12. Qxd5+ Bd6
13. Qf5+ Kc6
14. Qb5#
Check mate.
That's why I said you were too greedy, you really didn't have the time for snatching that Rook since your King was under such a heavy attack. (Which of course was why I didn't do anything to prevent it.)
My 4:th move, Nxf7 seemed okay to me at the time. I was pretty sure it wasn't as good as Nxc6 but I thought 2 central pawns and your King unable to castle was good compensation.
Apparently it wasn't. Chessmaster claims I lost 2.3 pawns on that move. Fortunately for me, you gave it back with your 6:th move, Nxd5, where you lost 3.3 pawns. That and your 9:th move, Nxc2 were your biggest mistakes according to Chessmaster (Nxc2 losing a whooping 5 pawns).
Annotations by Chessmaster 9000 Auto-Annotator. 60 seconds per move.
White Black
Book Move 3 2
Leave Book 0 1
CM9000 Agrees 9 8
CM9000 Disagrees 2 3
Agreement Pct. 82% 73%
Total Error 2.32 8.41
Relevant Error 2.32 8.41
Missed Mate 0 0
Moved Into Mate 0 1