Self-mate.
What is the worst way to lose at chess?
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The worst way to lose at chess? How about this one. My poor opponent was up the whole game and even had 11 point material advantage on me when I pulled a super sneaky move on the poor Dude. I actually felt sorry for him after this, hence why I have changed his name. Enjoy this and take a lesson.
"Sucker punch"mates when in dominant, winning position (especially when you see it the moment you've moved+don't think your opponent has & try not to react-eventually to no avail)- similar, miscalculation of move sequence by just ONE when both working towards a mate-these are bad-but the worst,for me, is when you've played well and accurately in a long,close,game-especially over many days-finally got the upper hand and with JUST ONE casual or tired move,throw it all away.
When you commit 2 HUGE MISTAKES at the end, and you resign. Game: https://www.chess.com/daily/game/270610074
gf calls and you have to resign :9
i had recently had an operation and was drugged up when i moved my queen to a place where my opponent took it with a pawn.
Resign.