I think it's safe to say that all Go players have, at some time or another, experienced a "bad beat", a poker terminology for a situation where a person who has a vastly superior hand over his opponent(s) loses anyways, despite the odds. So the analogous situation for Go is where a person who has a vastly superior position/major lead over his opponent loses anyways. These kind of games also tend to be more memorable than others (0.5 points come a close second?).
So what are some of your bad beat stories? If it was played online, be sure to post the SGF if you still have it!
I'll start with a recent one (less than a few weeks ago). I was playing an online game against aguilar1 (Fernando Aguilar) in a 0.5 komi game where I took Black on one of my 5d accounts.
Up to move 88 things were looking okay for me and I was holding up on my own. I didn't make any major mistakes, but did play a few slack moves here and there so I was behind by a teeny bit. Sirens went off on my 88th move though, which I played on the last second of my byoyomi period. It went from this:
$$c Move 88
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . O X X . . . . . . . . . . . |
$$ | . . . O . O O . X . . . . . X . . X . |
$$ | . . O , . . . . . , . . . . . , X O . |
$$ | . . O X . . . . . . X X X . . . . O . |
$$ | . . X X . . . O X X O O O X . . O . . |
$$ | . . . . X X X X O O X . . . . . . . . |
$$ | . . . . . O O O . . O O . . . . . . . |
$$ | . . . . . . . . . O . X . . . . O . . |
$$ | . . . X . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . O . X . . . O . . . |
$$ | . . . X . . O . . . . . . . . . . . . |
$$ | . . . . . . . . O O . X . . . B . . . |
$$ | . . . . . . . X X O . . . . . O . . . |
$$ | . . . . . X X X O X X . . . . . . . . |
$$ | . X X X X X O O O O X . . X . O . . . |
$$ | . X O O X O . . . . X . . X O . . . . |
$$ | . O . . O . O . . . . . X O O . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------
- Click Here To Show Diagram Code
[go]$$c Move 88
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . O X X . . . . . . . . . . . |
$$ | . . . O . O O . X . . . . . X . . X . |
$$ | . . O , . . . . . , . . . . . , X O . |
$$ | . . O X . . . . . . X X X . . . . O . |
$$ | . . X X . . . O X X O O O X . . O . . |
$$ | . . . . X X X X O O X . . . . . . . . |
$$ | . . . . . O O O . . O O . . . . . . . |
$$ | . . . . . . . . . O . X . . . . O . . |
$$ | . . . X . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . O . X . . . O . . . |
$$ | . . . X . . O . . . . . . . . . . . . |
$$ | . . . . . . . . O O . X . . . B . . . |
$$ | . . . . . . . X X O . . . . . O . . . |
$$ | . . . . . X X X O X X . . . . . . . . |
$$ | . X X X X X O O O O X . . X . O . . . |
$$ | . X O O X O . . . . X . . X O . . . . |
$$ | . O . . O . O . . . . . X O O . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
...to this:
$$c Few moves later
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . O X X . . . . . . . . . . . |
$$ | . . . O . O O . X . . . . . X . . X . |
$$ | . . O , . . . . . , . . . . . , X O . |
$$ | . . O X . . . . . . X X X . . . . O . |
$$ | . . X X . . . O X X O O O X . . O . . |
$$ | . . . . X X X X O O X . . . . . . . . |
$$ | . . . . . O O O . . O O . . . . . . . |
$$ | . . . . . . . . . O . X . . . . O . . |
$$ | . . . X . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . O . X . . . O . . . |
$$ | . . . X . . O . . . . . . . . . . . . |
$$ | . . . . . . . . O O . X . . O X O . . |
$$ | . . . . . . . X X O . . . . . O X . . |
$$ | . . . . . X X X O X X . . . . O . W . |
$$ | . X X X X X O O O O X . . X . O . X . |
$$ | . X O O X O . . . . X . . X O . X . . |
$$ | . O . . O . O . . . . . X O O . X O . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------
- Click Here To Show Diagram Code
[go]$$c Few moves later
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . O X X . . . . . . . . . . . |
$$ | . . . O . O O . X . . . . . X . . X . |
$$ | . . O , . . . . . , . . . . . , X O . |
$$ | . . O X . . . . . . X X X . . . . O . |
$$ | . . X X . . . O X X O O O X . . O . . |
$$ | . . . . X X X X O O X . . . . . . . . |
$$ | . . . . . O O O . . O O . . . . . . . |
$$ | . . . . . . . . . O . X . . . . O . . |
$$ | . . . X . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . O . X . . . O . . . |
$$ | . . . X . . O . . . . . . . . . . . . |
$$ | . . . . . . . . O O . X . . O X O . . |
$$ | . . . . . . . X X O . . . . . O X . . |
$$ | . . . . . X X X O X X . . . . O . W . |
$$ | . X X X X X O O O O X . . X . O . X . |
$$ | . X O O X O . . . . X . . X O . X . . |
$$ | . O . . O . O . . . . . X O O . X O . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
...which had me sink further behind, bad news since endgame is my weakest area. Ah, but that's only the beginning. As we entered endgame, I tried to play more efficiently to try and make up for my losses on the lower right. I was also a bit, again as they say in poker, "on tilt". Needless to say, I neglected an important group and ended up in a situation where my central group was in major danger:
$$c Move 138
$$ ---------------------------------------
$$ | . . . . O X X . . . . . . . . . . . . |
$$ | . . . O . O X X . . . . . . . . . . . |
$$ | . . . O . O O . X . . . . . X X X X . |
$$ | . . O , . . . . . , . . . . . O X O . |
$$ | . O O X . . . . . . X X X . X O O O . |
$$ | . X X X . . . O X X O O O X . X O . . |
$$ | . . . . X X X X O O X . . . . . . . . |
$$ | . . . . . O O O . . O O O O X X O . . |
$$ | . . . . . . . . . O . X X X O . O . . |
$$ | . . . X . . . . . , O O O X . , . . . |
$$ | . . . . . . . . . O . X X X . O . . . |
$$ | . . . X . . O . . . W . X O . . . . . |
$$ | . . . . . . . . O O . X X . O X O . . |
$$ | . . . . . . . X X O X X O O . O X . . |
$$ | . . . . . X X X O X X O . . . O . O . |
$$ | . X X X X X O O O O X . O X . O . X . |
$$ | . X O O X O . . . . X . X X O . X . . |
$$ | . O . . O . O . . O X . X O O . X O . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------
- Click Here To Show Diagram Code
[go]$$c Move 138
$$ ---------------------------------------
$$ | . . . . O X X . . . . . . . . . . . . |
$$ | . . . O . O X X . . . . . . . . . . . |
$$ | . . . O . O O . X . . . . . X X X X . |
$$ | . . O , . . . . . , . . . . . O X O . |
$$ | . O O X . . . . . . X X X . X O O O . |
$$ | . X X X . . . O X X O O O X . X O . . |
$$ | . . . . X X X X O O X . . . . . . . . |
$$ | . . . . . O O O . . O O O O X X O . . |
$$ | . . . . . . . . . O . X X X O . O . . |
$$ | . . . X . . . . . , O O O X . , . . . |
$$ | . . . . . . . . . O . X X X . O . . . |
$$ | . . . X . . O . . . W . X O . . . . . |
$$ | . . . . . . . . O O . X X . O X O . . |
$$ | . . . . . . . X X O X X O O . O X . . |
$$ | . . . . . X X X O X X O . . . O . O . |
$$ | . X X X X X O O O O X . O X . O . X . |
$$ | . X O O X O . . . . X . X X O . X . . |
$$ | . O . . O . O . . O X . X O O . X O . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
So not only was I ~10+ points behind, but now I was about to die extravagantly with 150+ people watching. Fantastic. In fact, all White had to do was let me live in gote and the game was his anyways, I guarantee it. /men's warehouse
I'll leave the SGF here so you can see the conclusion, kibitz and my ID removed

:
So tell me your stories

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