BQM184

Not joseki, but why?  

is joseki for every other pincer, but not when the marked high tight pincer is used. Why is this?

Maybe cut is good  

I'm guessing that it's because Black can push through and cut and get a better result with this than with other pincers, but I'm not sure. That's the question.

Charles If now White a, Black b, White c, Black d, White looks heavy. It seems, in contexts where White does play the press, White has some other way to fight after in mind.

sometimes played  

In a couple of pro games, this is played when the marked stone is already in place. Perhaps this helps.

Bad shape  

Bill: After White has bad shape.

Compare this diagram with the next, which is joseki.

Joseki  

Anonymous: I am confused. Is this the intended diagram?

Bill: No, it is a comparison diagram. When Black has played the stone, instead of the high pincer, is joseki.

More complicated variation  

After , White can cover at a, jump at b, or cut at c.

Dieter: indeed, these variations are explored on josekipedia.