After
Qxc6+, assuming that's what we decide, there are 3 possible responses from Ng5.
1) 11. ... Qd7.This is probably the best move. Here, we almost certainly have to trade queens. I wanted to keep queens on the board, but we simply can't allow black to play
Ba6. For example,
12. Qc2? Ba6, and our king is trapped in the middle, our knight is pinned, and we are in terrible shape. Here black has deadly threats, such as
Qb5 and
Qg4. We are simply losing here.
11. Qxc6+ Qd7 12. Qc2? Ba6![[image loading]](http://i.imgur.com/GMije.png)
We have no choice really but to play
12. Qxb7+. Here black also has an interesting option... The simple recapture
Bxd7 looks most obvious, which could lead to the example position I described earlier:
11. Qxc6+ Qd7 12. Qxd7+ Bxd7 13. a3![[image loading]](http://i.imgur.com/pK3xc.png)
Or, black could even play
Kxd7. This would connect the rooks and begins to activate the king now that queens are off the board. Here black would have the intention of playing
Ba6. The threat of keeping our king in the center isn't so bad here with queens off the board. Trying to castle right away would lead to
13. O-O Ba6 14. Re1, moving into another pin, because
Rd1 could be met with
Be2, Re1, Bxf3, and we are in serious trouble.
11. Qxc6+ Qd7 12. Qxd7+ Kxd7 13. O-O Ba6 14. Re1![[image loading]](http://i.imgur.com/5hYiq.png)
I think a better move would be
13. a3, which is very similar to the line and image posted above. No matter how black responds now, we will be able to exchange a piece and remove the knight from e4. The more we simplify the position a pawn ahead, the more we can solidify our slight advantage.
2) 11. ... Bd7.This move looks bad at first glance, because it simply loses a central pawn, but the follow-up seems at least playable to me. Black can win a pawn back with:
12. Qxd5 Nxd2 13. Bxd2 Bxd2+ 14. Nxd2 Rxb2. The resulting position still looks better for white. We are up a pawn, have stronger control of the center, and black's pawn structure is very weak. Perhaps the only advantage black has is the bishop on an open board.
3) 11. ... Kf8?!This is probably the most interesing move here... With it, black prevents the trade of queen's and goes for a dynamic, attacking game. The black king looks less secure, but the dark-squared bishop is currently defending the diagonal well. By keeping the rook on h8, black is threatening a king-side attack by eventually playing h5 to try and bust open the king-side. By keeping the queen on the c6 square, black is also threatening a rook shift with tempo, for example
12. O-O Rb6 13. Qc2 Rg6. However, he probably has to develop the bishop first because I don't see a good way for him to respond to
Qa8, pinning the bishop and holding the black queen in place.
11. Qxc6+ Kf8 12. O-O![[image loading]](http://i.imgur.com/U7K2p.png)