He's back. 16. Bd2
I don't know exactly why I thought that "defend it with the bishop (leaving e3 vulnerable)" was automatic, I had Bb2 in my mind, but of course there's also Bd2. I have an interesting tactical idea here, that I have to look closer at. I don't feel too bad about letting him twist in the wind a little, so I'm going to post the idea WITHOUT making the move, and let you guys discuss its brilliance/idiocy as the case may be.
I'm looking at 16. ... Qe7, threatening Rxc3 (and if Bxc3 then Qxe3+!). At first glance it leaves my d-pawn underdefended, but my idea is that if 17. Nxd5 Nxd5 18. Qxd5 Rc5 19. Qe4 (anything else loses the queen) Qxe4 20. fxe4 Nc6 then his knight is pinned to his rook and can't move, while I threaten Nxd4 exd4 Bxd4+ to win back the pawn with initiative (and a potential fork on his rook). He can't get an extra defender onto the knight, therefore he has to move the rook on move 21, and after 21. ... Nxd4 22. exd4 Bxd4+ material is back even, and I've created an isolated pawn that might give me good endgame chances.
I'm pretty sure that after 17. Nxd5 the line would basically be forced. I'm not 100% sure the resulting endgame is *actually* good for me yet, though it looks nice at first glance. I also haven't looked at what other options he has on move 17 if he doesn't jump at the "free" pawn. I'm going to sit on this position for a while, analyze the endgame, analyze move 17, and make sure I'm not missing anything on the combo. Also, there might be a better continuation for me in there (I'm not sure 19. ... Qxe4 is my best try there yet either)
In the meantime, it's still my turn, and here's the position. You guys are welcome to discuss my ideas for a little while, I'll probably not decide on whether I'm trying it until tomorrow.
Moves so far:
1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. cxd5 cxd5 5. e3 Nc6 6. Bd3 g6 7. Nge2 Bg7 8. O-O O-O 9. f3 e5 10. Qb3 b6 11. Bb5 Na5 12. Qb4 exd4 13. Nxd4 Bd7 14. b3 Bxb5 15. Qxb5 Rc8 16. Bd2
Current position (black to move):