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900 rated player beats 800 rated player

13...Bg4
as you may see, it's the first obvious blunder.
white found a good tactic 14.Rd4! here, but even if you could exchange with 14.exf6 Bxd1 15.Nxd1 gxf6, R+P is usually not good enough compensation for B+N (especially in this case the pawn on e5 is very weak)

18...Nc4?! 19.b3 Na5?
knights are usually stronger when it's at the center of the board. also in open positions like this bishops are usually better than knights. as the knight is protected by Re8 (so the exchange doesn't ruin your pawn structure), there's no reason to move that knight.

21.Bxg5???
i don't get this at all.

23...Nd4??
of course you have to take back.

25.Kf1??
after 25.Kf2 (...Nxg3 26.Nxe8) it's just game over.

37.Nh4??
although white made things unnecessarily complicated, i think 37.Kf1 (...Rh2 38.Kg1) is still winning for white.
something like 28.a4 Rb2 29.Rd1 (...Rxb3 30.Rd7 threatens Nc5 and Rxg7+)(...Kf7 30.Nd8+) was much more clearer.

I'm U2000 and didn't see detailed engine lines but rather focused on general theories (which I think more helpful at this level), so this analysis may contain some errors.
Move 14: white can win 1 point of material by playing exf6! Then after black captures your rook with Bxd1, you have the inbetween move of fxg7!
Move 25: white can win 2 points of material by playing Kf2! Then after black captures your rook with Nxg3, you can simply capture his rook with Nxe8, since you won't be in check.
Move 29 (and similar moves): it's worth sacrificing a pawn here to develop your rook. A move like Re1 would be good for white, even though it sacrifices the pawn on a2, because it then allows you to play Re2 on the following move, and soon, your king and rook will both be active. Remember that endgames are all about keeping your pieces as active as possible, especially your king and rook, and it's often worth giving up a pawn to achieve this.
2... Bc5 is a dubious move, clearly better for white, but there may be some tricks here.

From here up to move 13...Bg4 all is relatively reasonable considering the player's ratings playing well actually. This move hangs a piece for black.

From this point on white is pretty much crushing it. Black of course could have complicated it more, or white could have attacked harder, but white was doing a good job for a while...

33 Ne4 is stronger than 33Nb5, yet white is still easily winning up a piece with a superior pawn structure. Although some credit to black for activating the king.

Towards the end... The last 10 or so moves it's as if white only really wanted to use the knight. That poor rook sat alone in the corner passively unused. The king also remained on the back row meekly waiting to be checked.
37 Nh4?? This takes a won position and turns it into a lost position. The position called for Kf1 to retain the advantage, any other move is losing or fighting for a draw fro ma worse position.

Advice for black: Don't just hang pieces for nothing, you were fortunate to get out of that bind.

Advice for white: Be sure to use all of your pieces. If you are winning a 3 on 2 fight, but 2 of your pieces are sitting around with their thumbs up their butt then it's really a 2 on 1 to your disadvantage.
Do not play blitz, play rapid or classical.
How long should we analyse a blitz game you played in 4 minutes?
Agree with tpr. Don't analyze 3 0 games. And don't play them. They are like candy. They taste good but not good for you. If you play blitz, at least do 3 2, 5 0 or 5 3. But rapid or classical better. I believe it was Kramnik who said anything below 5 0 was not worth looking at. 5 0 at least you can have some plans.
the problem is that while many of you say longer games are better, somehow blitz and bullet are much more popular online.
I think it's kinda natural for beginners to watch top players playing extremely high level of blitz and bullet on lichessTV or streaming and wanna try to imitate that. actually only top 0.1% players can do that.
When you start off doing something, you go slow, then when you get better, you speed up.

Take driving a car for example. You don't start racing when you're new. You start slow, and you gradually speed up as you get more experience.

This is why it's more acceptable for high rated players to play fast games, whilst low rated players should only play rapid or classical.
@Saifahtver I’m more interested in your analysis

Do you derive pleasure from just winning or does it have to be under some sort of false pretense.

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