Game I played this morning as White where I lead for most of the game and ended up winning. However both players missed a huge move. A thermonuclear fusion tesuji if you will. Can anyone spot the move that would win black the game from the jaws of defeat?
From the last black move, I assume it has something to do with the whole center white group's life and death. I haven't read it out, but looks like it might eventually be a ko in the center (very big ko)
Partially correct. The proper tesuji by black leaves white choosing which side of the board he wants to live with. Left or right. And can only choose one side to live. :)
The thing is that if it becomes a ko, white doesn't actually have to save both sides, but can leverage that and make an exchange for the whole upper right black group. I haven't counted, but feels like roughly an even trade. And we are back to count the ko threats if black didn't want to sacrifice the upper right and continue the ko. (or if it is not an even trade? and we are up to yose)