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Opening Knight Moves + King Walk

In this aggressive variation of the Slav the knight gets it done at the cost of tempo & development. In return however, white immediately loses castling rights. The light square bishop further weakens king side pawn structure & opens the H file for the rook. All of this results in white's king going for a walk.

en.lichess.org/t7Xw7v4T/black#0
So black sacrifices a piece for one pawn and has zero developed pieces while white has two and while white controls the centre. This cannot work. Even better variations like the Allgaier King's Gambit or the Cochrane Russian Petrov where there are two pawns for the piece are generally considered unsound.
Yeah, you definitely didn't win this game because of your opening. That's an incredibly unsound sacrifice.
Analyse after the knight sac: White has lost his castling rights. However he can castle "artificially" without problem by putting his rook on e- or d-file and play Kg1

White has both the centre control and is ahead in development.

This opening doesn't look temptating to play as black I think. I would guess white messed things up later in the game.

You see, white doesn't have to take any risk from move eight onwards. All he should do is make his king safe and try to trade, as an endgame would be cleary winning. So, in a more concrete form, white's idea should be something along the lines of 9. Be3 (defending the pawn) and then simply Rf1 and Kg1. Black doesn't have any play there. My advice: don't sacrifice pieces. Just try to play decent chess. Get your pieces out, castle your king, and just play chess. It might seem boring, but you simply won't improve much by playing these crazy and unsound opening lines.

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