12. Bxd2 was played in Tjipueja, Werner (2148) vs. Mikheev, Stanislav (2384) 2006.05.27 which black won. It has also been played in many Gameknot games. It is anoterh possibility.

Why not take back with the bishop and then castle, Im missing something? I wonder then which is best?

It's a judgement call. White has judged that as the King is quite safe near the centre - where it will likely be needed in an endgame - then 'castling longhand' was a time saver. After all, 12.Bxd2, 13.0-0, 14.Rd1 takes three moves, AND White will no doubt have to move his dark-square bishop again. White has a lead in time. He's going the right way (in my view) to maintaining that lead - at least for the time being.

15.Bd3 is so obvious I would probably have played it a move earlier.

'Rook on the Seventh' - very nasty once firmly established there. I recall once in a correspondence game, blundering a knight, but managing to establish both rooks on the 'seventh rank'. Eventually a note arrived "I don't deserve to win this... Draw?" Too late, mate, thought I: I'm already winning! Those rooks were well worth the piece deficit.

White's centre is under a bit of pressure, which is Black's aim in this opening.

I'm pretty sure I would have looked at 20.Nc6 or 20.Nb5 in this position. The latter threatens to win a pawn, and I'm not sure that it can be saved.

This game looks very drawish, now.

Acceptance would certainly have been reasonable. But the is little risk in carrying on in the hope of a mistake...