A mistake in the Chess Analysis?

Hi guys.  First time posting here.  I noticed from my this game at 9. Nxd5, the analysis shows that its a mistake.  However, when I asked it to elaborate, it shows me that I have lines that I can take the Queen.  This is really weird.  Can someone help to look into it?

Hi,

The computer engine evaluates the game position by position. Based on its calculations, it believes that exd5 is a better move for you, therefore it considers Nxd5 a mistake. I couldn't find the line where you could capture his Queen, but most likely you're able to do this because he also made a mistake after Nxd5 (Bxe4 was his mistake). Also, just because you're able to take his Queen, that doesn't immediately justify Nxd5 (because who knows, maybe another move like exd5 could've let to mate, for example), so in a situation like that, even a move that wins a Queen would be considered a mistake.

Here's my profile in case you need to check who you're getting advice from: https://www.chess.com/member/ellipsoul

Hi Ellipsoul,

Thanks for the explanation.  What the analysis shows me is after 9. Nxd5 Nge7 10. Qa4 a5 11. Rd1 O-O 12. Nf6+ gxf6 13. Rxd8.  Understandably, the opponent could do a different maneuver if he/she did see this coming.  Thanks. 

True.  I usually play exd5, but I was curious to see what will happen if I play Nxd5 instead.