Did this occur to you that your opponent pass at midgame?
In my game with a 4kyu, I captured my opponent’s large group invasion into my moyo. To make things worse, during the escape, I reduced his/her corner’s liberty and killed the corner.
It’s no brainer that I am winning the game. Instead of resign, my opponent passed. The estimate showed I am winning like 20+ points even with the captured stones counted as live. I did not want to get into dispute on what’s live or dead, so I refused to pass. Instead I reduced one more liberty on the already dead corner and asked in the game chat why he/she passed? Without answering, my opponent passed again.
This time, I chose not to play a meaningless move and chatted my opponent directly stating pass is not a valid option. Either resign or continue to play. My opponent resigned immediately without ever responding my messages.
I did check before my first message that my opponent resigned before so I assumed he/she understood what resign is and how to use it on OGS.