My Thirteenth Chess Tournament, Game 4 (Messy Modern)

In this game my opponent played a defense that I know very little about, the Modern Defense. While I understand some of the basic ideas for both players in this opening, I am not familiar with the theory. Nevertheless I managed to get a decent position out of the opening. However, as the game progressed, both players blundered and risked losing. Unfortunately for me, I was the last one to blunder a piece, in time trouble. Hence, I lost a game that I should have been able to at least draw. Here is the game:

Themes: Overloading, Forks, Trapped Piece, Zugzwang, Pins, Desperado, Basic Combinations, Opening Lines, Simplification, Using Knights, Initiative, Using the Queen, Fianchetto, Weak Pawns, Passed Pawns, Converting Extra Material, Mating Nets, Queenside Attacks, Knight Endings