[<< wikibooks] Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bb5/3...f5/4. Nc3/4...fxe4/5. Nxe4/5...d5/6. Nxe5/6...dxe4/7. Nxc6/7...Qg5/8. Qe2/8...Nf6/9. Nxa7/9...Kd8/10. Nxc8/10...Qxg2
White has tried both ways of defending the rook: 
11. Qf1, after which Black can choose between 11...Qf3 and 11...Qxf1 12.Bxf1 Kxc8, and
11. Rf1, after which Black can choose between 11...Qxh2 and 11...Kxc8.
If Black doesn't capture the knight while it's on c8, White is going to go Nb6 and ruin Black's queenside pawns. Other than that, the tactics have subsided and Black scores terribly out of the resulting middlegame positions. Even in the line 11.Rf1 Qxh2 12.Nb6 cxb6 where material is level, Black's pawns look silly and White has the bishop pair on a very open board.