Analyze Please - Move 26 Bxa3

I recently played against a much stronger opponent that started with 1d4. I ended up winning the game, but after using the engine to analyze the match...

The computer said I made three blunders which I don't necessarily agree with... Or perhaps understand. What is your opinion regarding move 26? What is your advice to give a better performance?

https://www.chess.com/livechess/game?id=1711282224

Not sure how y'all link games here. Using my phone. My apologizes. Here is more information.

[Site "Chess.com iPhone"]
[Date "08/31/2016 10:20AM"]
[White "ramchandra123 (1503)"]
[Black "jr87 (1386)"]

1.d4 Nf6 2.e3 d5 3.c4 e6 4.a3 g6 5.Nc3 Bg7 6.cxd5 exd5 7.Nf3 O-O 8.Bd3 b6 9.e4 dxe4 10.Nxe4 Re8 11.Bg5 Bb7 12.Nfd2 Nbd7 13.O-O h6 14.Nxf6 Nxf6 15.Be3 Qd5 16.f3 Ng4 17.Be4 Nxe3 18.Bxd5 Nxd1 19.Bxb7 Bxd4 20.Kh1 Nf2 21.Rxf2 Rab8 22.Rff1 Rxb7 23.Rae1 Rxe1 24.Rxe1 Bxb2 25.Re8 Kg7 26.Nc4 Bxa3 27.Nxa3 b5 28.Re1 b4 29.Nc4 Rb5 30.g3 b3 31.Nb2 a5 32.Re2 c5 33.Re5 Kf6 34.f4 g5 35.Re2 Rb4 36.Nd3 Rb5 37.Nb2 Rb4 38.Re5 a4 39.Rxc5 a3 40.Rc6 Kg7 41.Nd3 a2 42.Ra6 b2 43.Nxb2 Rxb2 44.fxg5 hxg5 45.h4 gxh4 46.gxh4 f6 47.Ra7 Kg6 48.Ra6 Kh5 49.Ra5 Kxh4 50.Ra3 f5 51.Kg1 f4 52.Kf1 Kg4 53.Ke1 f3 54.Kd1 f2 55.Kc1 Re2 {Black Wins}

👀

Please post a diagram

There! As you see, when you are winning, keep things simple!

I don't understand either. Why not Bd4?

Thank you williamn27 for posting the diagram!! I'm still new to forums and not sure how to post the diagram.

Great analyze Williamns27 I really appreciate the help. I can learn much from this. Thank you, Sir!!

You're welcome, and press the colourful button on the top left of the comment box. It's quite simple. Or type 'help' in the search bar at the top right of your webpage and seek what you need.

I'm not that good, OP. I'm just a 15 hundred. Consult a better player for a better analysis.

And don't call me sir. I'm 15  years old. 

You should've thought of that before you made your username "william." You just want to put sir before that, I can't help it. Sir.

Lol

:)