I once played chess
CHESS CONFESSIONS - GO!

i once should've lost since i got mated, but there was a confusion and I went instead of my opponent in a tournament and won

I never played an OTB game with ANYONE other than my family. I'm still trying to get good enough to feel confident enough to enter a tournament.


In a qualification OTB tournament to select the players who would compete in the under-20 championship of Canada, I once calculated and played a sacrificial combination to win my opponent's Rook... and then at the end of the forced sequence I forgot to take the free Rook and played a different move instead.
I won anyway. We must have both been terrible players.

I once resigned after a long piece trade thinking I had lost a rook. I didn't realize that I had earned that rook.

I lost a winning game after my opponent did something almost as bad as this.
https://youtube.com/shorts/nVaHY24vSZQ?feature=share

I never played an OTB game with ANYONE other than my family. I'm still trying to get good enough to feel confident enough to enter a tournament.
Join a local club as a stepping stone perhaps...
I accidentally stalemated a winning position against a 5 year old in a local tournament.