Also, this move is not very obvious!
Resigned With A Winning Position!
It wasn't obvious, but not really very hard. There were only 3 legal moves , two of them gets mated outright. What were the ratings of those players? Was it a blitz game?
White about 2300 and black about 2400. Don't know alot about the game but I think it was not a blitz game
I know it does not make sense but in some culture, ranks and rating DO MEAN something and it is unacceptable that a weaker player beats a stronger one.
I remember playing my teacher and resigned in a winning position just to not humiliate him (so he wouldn't be seen as a teacher who gets beaten by his students). However, such premature resigniation might be seen in a different way to other cultures.
Overall, I believe its up to the different ways we see things.
He resigned because he thought it was a checkmate on the next move. But did not see the knight move!
In this game two Icelandic guys played, Haukur Angantýsson (IM) and Benedikt Jónasson (FM)
White (Benedikt) resigned in a position that should be lost.. but! He forgot one move! That wins the game! They both, pretty strong chess players did not see the move! Nobody did!
http://www.chessgames.com/perl/chessgame?gid=1340127