Weird game between 8d and 9d

Last Sunday was held the final game to decide who would go to the World Mind Sports Games representing the USA in Beijing in October. The game confronted Joey Hung 8d vs Jie Li 9d and it was very interesting and very didactic as a sample of how to count ko threats and how to handle them.
But what strikes me the most was a sequence I found during the game and I’m still thinking it’s worth trying. I was said during the game that my move wasn’t good, but without explanation.
As you can see on the next image, there is a big fight going on the upper right corner of the board where there are several white and black groups involved and winning this fight would almost decide the result of the game.

Now that you’ve seen the board I’ll tell you that the original sequence ends up with a huge ko for live or death. You can see the whole game on one board and my variation on another one.
Related posts:
