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)
According to the AI. wedge at K8. Theres no ko if black plays correctly. White is forced to choose. :)
That much I gather, dig and clamp (K8 H8) what is the main line from the AI (bK8 wK7 bH8 wG8 bG10, it leads to a ko right?) AI doesn't always find ko variations easily and often not that good when the winrate is far from even (although the point difference might still within human, especially amateurs range, like +- 10 points going into yose)
Ahh I see! KO it seems could be possible then.
For such a large dragon and such a big loss giving up any side, I feel a human would almost certainly opt to take the ko. And for black to invest so many moves setting up a kill, I also feel black can not afford to back off either.
The question is how would the ko progress? I seriously have no idea. There are quite a bit of local threats as well as the whole right side for white, and quite a bit of local threats for black and some on the lower left. It's really up in the air and hard to judge (and their value also quite hard to judge). White can not afford to lose this ko though, but it can possibly switch to other ko as well.
It will not be a ko, in the event that white tries to make one black just pokes at the cutting points reducing light to one eye.
Can you show the variations for this poking?