One bad move

This Game I played few Minutes ago. My Opponent is almost 300 Points higher than me. I kept fighting but on Move 27 I blundered a Piece. So I lost the Game.

Truth be told you are already worse even before the blunder. f4 and e5 are not good moves.

@moriaki8000 I concur, I think it's still a draw though with perfect play before the blunder.

It's a draw but only black has winning chances

Without the blunder black should win. Bd2 is passive because of 22 f4 and 24 e5.