Please help me point out my worst move, and what to do instead. (Besides give up the game and start playing gomoku instead with my stones. Seriously speaking: the new Ipad version of gomoku was rather pretty...)

So in other words: Gomoku from now on. ( Really terrible to see the same fault so many times. I agree with you, hasty moves that just becomes broken shapes. But if I stop doing broken shapes all day long, maybe my game will improve....)

Ed's comments are so good, I just added a few of my own.

_________________
The Adkins Principle:
At some point, doesn't thinking have to go on?
— Winona Adkins

Visualize whirled peas.

Everything with love. Stay safe.

Thanks Bill,
To conclude. This game included terrible shape and no sense of direction.
It is good that one always play yet another one... if one also learn from the mistakes....*mutter*

The game wasn't completely lost for black yet (at least you are a strong dan player)... black, can try some crazy plays and there is a correct answer for them (it is just keep defending instead of attack the lonely stones, thing that goes against ours first thoughs in a desesperate invasion like this) but if white misread (quite easy in the very last moves...) you get a lot of profit or at least white needs to sacrifice more than the winning 6.5 point diference.

Anyway, is an once in a blue moon winning chance that worth the shoot.

@Ellyster: there was nothing there.

@Ellyster: And if white passes then what do you do (other than lose a point and look a fool)?

Also this game was played on OGS so there is plenty of time to work out how to avoid absurd rip-offs.