I do not understand why I lost


#1

I have played as white in this 9x9 game: https://online-go.com/game/16296789
Obviously my opponent tried to invade into the upper territory. However, he stopped this and passed and so did I. I considered the upper territory to be mine as long as my opponent does not proceed the invasion.
So, once the selection of dead stones was displayed, I marked the black invader as dead and pressed “accept”.
After that my opponent did something and the game ended scoring the entire upper group as dead.
There might be a way to kill it (too complicated to predict for a player of my rank) but as long as that did not happen and both players pass, it should be white’s, shouldn’t it?
Furthermore, I would expect the game to continue if there is a conflicting understanding of a group’s status. Instead I just died and the game ended.
Can someone explain why?

Guido


#2

Your top territory (although you do need a move to turn it into territory) isn’t marked as territory, ostensibly because the black stone at E8 isn’t marked as dead.

OGS manpages about scoring


#3

Yes, but before I pressed accept I marked it as dead. Could it be a bug in my Android client (OnlineGo)?


#4

You’d have to ask the developer of that client in that case.

Your opponent can mark his stone as alive, but it prevents you from accepting the score for 2 seconds. Always make sure the correct score is displayed before you accept.


#5

Thanks, I think I remember having a similar situation on the web and there the game continued…


#6

#7

It does not matter how it was rated so much. It was most likely a client error.
However, I would still be interested if the upper area is black’s or white. Any hints?


#8

I posted variations in your game.


#9

Thanks so much. Did not even see the invasion on the lower. I think my opponent didn’t either :slight_smile:
But the upper white group lives as I understand.