DoubleThreat/Solution

is a double threat  

Example taken from British Go Journal No. 92, Autumn 1993, Page 4.

is a double threat, since a and b are miai for the life of the long Black chain.

However...  

Kirk: But after the continuation through 4, white lives. If we can also kill the white group here, then black will win the game for sure...

Can we kill white?  

Kirk: If it works, it would be better to play here to kill white.

Continuation trying to kill white  

Kirk: It seems black can win this capturing race by one move. But white has another move at 7...

White 1 here instead of 7  

Kirk: Can white make anything out of this?

White tries his hardest to...  

Kirk: Best I can see...

...make a ko.  

Kirk: ...white gets a ko. 7 at 3. But black has no threat large enough and loses the game. I guess the answer at the top is correct, but it sure took a lot of analysis...