Roll-up
The roll up is a basic capturing technique, involving a sacrifice stone. The term has been coined here at SL and we don't currently know of any established name for it.
It starts with the placement atari of
,
connects, then
is a cut and atari,
captures the
stone, then
puts all those stones in atari and the group has been rolled up.
Notice that every liberty counts in this situation: if there is no white stone at the marked point,
is not atari and
can capture those two stones instead.
is again a sacrifice stone, meant to reduce Black's liberties. If
, then
is atari and when
connects at
,
completes the roll up.
Note that the sacrifice is needed: if
simply ataris,
connects and now White can no longer atari at a, because there is a stone lacking at b.
These techniques often make a big difference at the beginner level.
![[Diagram]](../../diagrams/25/69404d267c74b6c8472bd6822d879033.png)
![[Diagram]](../../diagrams/6/c5a83febb9ac761778c70980c07bfaa4.png)
![[Diagram]](../../diagrams/30/16ca55bdf301ce8ae32fa45d887b8bf7.png)
![[Diagram]](../../diagrams/14/4e4ace2838663d2d2b5deb8ddfaf92f8.png)
![[Diagram]](../../diagrams/27/9725f2609e18d4a23a6f2f001459c7a8.png)
![[Diagram]](../../diagrams/3/c261ffe5181f756776d440a0fcba424b.png)
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published under the ![Sensei's Library [Welcome to Sensei's Library!]](../../images/stone-hello.png)