What is the most stupid thing you ever done in chess?

Botez gambit

Moved the king when I could just take the piece that checked me.

Trying the bongcloud opening

I started playing chess ;-)

Closing my phone when i was playing and forgot that i was playing chess

Resigned a winning position. No joke, this really happened.

I resigned in this position. 22...Qg6+ wins outright as now e8 is covered and on the next move, I take the Queen.

But no, I went 22...1-0?? - yes, the BLUNDER WAS RESIGNING!

Underestimating my opponent

I lost and threw my phone against the wall, which shattered it. I bought a replacement for $150 a few days later and will take better care of it 🤠

I found a line to trade queens, then forgot to play my move!

Sacrificed my Queen thinking it was a checkmate until I realized she could it it with rook 😭

Trying to emulate tal playstyle.

Travelled halfway across the country to play in a tournament, stayed up all night playing cards, overslept, and missed the morning round.

wonderful question!!

after a long thought, it was letting my brother teach me the game so that he could use me to practice against for his games against the former Irish champion Philip Short.

here is Philip with Nigel Short at Bunratty.

Nigel is the one with the joke beard.