Richard Taylor: Here is some analysis:
[Event "Queenstown Chess Classic 2012]
[Site "Queenstown, NZL"]
[Date "2012.01.15"]
[Round "1.4"]
[White "Eduardas Rozentalis"]
[Black "Helen Milligan"]
[Result "1-0"]
[WhiteElo "2592"]
[BlackElo "1979"]
[ECO "C68"]
[Annotator "Taylor,Richard"]
[PlyCount "37"]
[EventDate "2012.01.15"]
1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. O-O Bd6 6. c3 c5
This has been played before. Another valid line is 6... ♗g4 7. d4
f6 8. ♗e3 ♘e7 9. ♘bd2 ♕d7 10. dxe5 fxe5 11. ♕b3 O-O-O 12. ♘g5 
7. Na3 Ne7 8. Nc4 Ng6 9. d4 Qe7?!
This is a natural but perhaps not the best. An alternative is: 9... exd4 10. cxd4 O-O 11. ♘xd6 (11. e5 ♗e7 12. dxc5
♗xc5 13. ♗e3 ♕e7 =) (11. d5 ♖e8 12. ♖e1 ♗f8 13. ♗g5 ♕d7 =) 11... cxd6 12.
♗e3 b6 13. ♖e1 ♖e8 14. ♕b3 ♗g4 15. ♘d2 (15. ♘g5 ♖a7) 15... ♗e6=)
10. dxe5 Nxe5?
This is virtually losing, but otherwise ♗lack isn't too bad. ♗etter was 10... ♗xe5 11. ♗g5 ♗f6 12. ♗xf6 ♕xf6 13. ♕d5 ♕e7 14. ♖fd1 O-O 15. ♘ce5
♖e8 16. ♘xg6 hxg6 17. e5 c6 18. ♕e4 ♗e6 =
11. Nfxe5 Bxe5
The game, probably now won for White is played now on auto by the GM. When I saw the game, I saw White was going to exchange on e5, but I thought he would follow up with 12. f4 which is not as good, but also hard to meet. I thought
12. Qh5 Bd6 13. e5 Qe6 14. exd6 Qxc4 15. Re1+ Kf8 16. dxc7
Be6 17. Be3 b6 18. Rad1 Ke7 19. Qg5+
1-0
I think if one is unfamiliar with a line it pays to be very careful esp. versus a GM! But I have never played a GM OTB so I can understand. Black was possibly over nervous on the occasion.