Poorly played middlegame and endgame

I lost while playing down because I got outplayed in the middlegame and endgame. I would like to know what my big mistakes were and what I should have done differently. This was an OTB game with a time control of 90+10. My opponent was under time pressure and I wasn't, but he played more accurately in the endgame. I have not done the computer analysis.

My opponent didn't even have much tournament experience. His rating was provisional. But I made him look like an expert.

I would have taken en passant because it leads to being able to isolate the d5 pawn on e4 in the next few moves. En passant, If bishop takes trade knight then later gang up on the pawn.

You mentioned that you wanted to get rid of the knight on e4. I would want to as well but you allowed him to open a file for his rook and connect the f5 pawn to a pawn chain in the middle of the board. Im not an expert but that looks like a positional mistake and you are restricting yourself.

Later when he took your bishop, it was probably better to take with your f pawn. Also opening the file for your rook and solidifying your weak pawn on d4. Taking with the queen looks wrong.

The rest of the game just looks like he converted from those 3 mistakes.

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The first thing i'd consider a mistake came from your opponent when they played exd4, releasing the tension and giving up the opportunity to play b4!, which you didn't have a comfortable response to. With this move they cede you the center and deactivate their b8 rook. I thought your play seemed very reasonable until 16. Bf4?. This is the first move I feel you didn't have a great reason to play, and it could indicate a lack of direction or plan. Generally you want to disrupt your opponents position first, before looking to strengthen your own if that's not possible. 16. Ne3 seemed very disruptive to your opponent, forcing a greater defense of the pawn and restricting his pieces. Following which are perhaps some nxd5 tactics. If not, reorganizing with Nh2 and disrupting his knight with f3 could be an interesting follow up, with some potential strong play on the kingside. 20.Nd2?! Had the good goal of disrupting your opponents strong knight, but you opened yourself up to some Bb4 pins, where you'd have to move your e3 knight to defend d2 and perhaps be vulnerable to a timely c5, working against your queens position. Starting with 20. a3 may have been necessary, just to maintain your rooks position on e1 that is preventing the c5 pawn push.

22. Qd2, followed by a knight move to get your bishop to the ideal e3 square would have been nice, but I'm worried rxf4 qxa5 will lead to some sort of losing position with your queen away from the defense. 25. b3 is the right idea, disrupting his pieces from reaching strong squares. 27.qxe3? Seems like a tactical mistake, luckily for you your opponent played Nb7 and gave you time to move your king instead of Rcf8 followed by e3 potentially. 29. Kf1?! I think puts your king in more danger and gets in the way of some f file play. Overall I think you played pretty well, you shouldn't develop pieces too casually though like with Bf4. you want to be disrupting the opponent or getting your pieces to squares where they have some strong purpose with each move. Also you should spend some time training your tactics everyday, otherwise opponents will play overly aggressive positional moves like 15.. Ne4 that you need to punish right away, or they will become a thorn in your position.

The decisive mistake is 40 Be1? while 40 Rh7 attacking Nb7 would have held.

nooo

A poorly played middlegame and endgame in chess can result from weak piece coordination, missed opportunities, or improper planning, often leading to loss of material or control of the board. Running Team Names