Let's say that W wants to invade a relatively strong black position at the 33 point. How does W live (regardless of whether giving black the additional outward thickness is a good idea).
From "Intermediate Level Power Builder, Vol I", white plays rather than Wa Bb to avoid a ko.
A move by black at , or at any of the circled points cuts off white's escape and requires white to make life with
.
Suppose black resists? How best to proceed now for white? Can white make life without ko?
unkx80: Block at followed by jumping out at
. With a (or b) and c more or less miai, intuition tells me that White should have no problems living.