Race to capture in the corner
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In Japanese, sekitou shibori, or "stone pagoda squeeze". See two-stone edge squeeze for the general pattern.
and
initiate a race to capture which White will win, because of the special properties of the corner.
If Black now connects at a, we have a fight between a group with an eye and a group without eye (Richard Hunter calls it a Type 3 fight in his work on Counting Liberties). There are no internal liberties. White has three outside (exclusive) liberties, Black too, but White is to play.
It is tempting to play the squeeze but it is wrong, again given the special properties of the corner.
This is one possible continuation. It is a Type 3 fight again. Black has one exclusive liberty in the eye ( captured) and counts the internal liberty at a as well as the approach liberties b and c. That's four liberties. White counts the circled liberties and has three. So even if White starts now (at c for example), White loses the semeai - but Black has to answer.
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