Roll-up

Starting position  

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.

Roll up  

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.

Conditions  

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.

Starting position 2  

Here is another kind of roll-up (note: see if this hasn't been described already).

Roll up  

is again a sacrifice stone, meant to reduce Black's liberties. If , then is atari and when connects at , completes the roll up.

Sacrifice needed  

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.