12
Black to play, I (white) have obviously cornered black so bad with B-f4 that they let the clock tick down for the full 5 minutes
(discuss.tchncs.de)
A bit annoying that people won't find the 'resign' button if they are unwilling to finish the match.
Lichess wrote an automated message into the chat about potential temporary banning so I didn't feel I needed to report it. In the end, I won the game :-)