Shut in
To shut in or to seal in or to fence in or to hem in or to enclose or to surround or to blockade a group of stones: these are flavours of a core aspect of Go, the surrounding game. Mostly, shut in, seal in, fence in and enclose refer to a group which is half surrounded by the opponent, half facing corner or side, moreover in a severe way, whereas surrounded is more general.
A general opening principle is not to allow for your stones to be shut in: avoid being sealed in.
封锁对方棋子,防止对方向外部发展。封在对局中的作用很大,有利于形成自己的势力,攻击、阻止对方发展。
Example 1.
This example comes from a game between Nakamura Doseki (White), and Hayashi Monnyu.
allows
to seal White's group into the top left corner.
Bill: I still think this page needs revision, but I have replaced the example with one based on Zinger's suggestion and one from pro play.
Caern: Explain " is a tesuji" plz.
Bob McGuigan:
is a clever move that is far from obvious since
leads to the capture of
. But these three black stones are now short of liberties and Black can no longer play at a as a local ko threat. If he does then White plays atari at b and captures the two black stones at
and a or the three black stones including
by playing atari at c.