L+2 group with descent I
It is said that the L+2 group is alive. However, when there is a descent at , it is not exactly the case.
The tesuji of and exploits the stone.
White's best response is , leading to a two-stage ko. White uses capture at a as a local ko threat. (Though some English books suggest at throw-in immediately, it needs another approach move at .)
When Black wins the two corner kos, Black connects at to finish White off.
Alex: Looks like a good way for a Moonshine Life position to arise. Now White just needs to arrange for a double ko somewhere else... :-)
It is worthwhile to discuss this variation. This leads to a direct ko with Black taking first, so is inferior to the main line. is the only move to avoid seki.
L+2 group with descent II