Roll-up

  Difficulty: Beginner   Keywords: Tesuji
[Diagram]
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.

[Diagram]
Roll up  

It starts with the placement atari of W1, B2 connects, then W3 is a cut and atari, B4 captures the W1 stone, then W5 puts all those stones in atari and the group has been rolled up.

[Diagram]
Conditions  

Notice that every liberty counts in this situation: if there is no white stone at the marked point, W5 is not atari and B6 can capture those two stones instead.


[Diagram]
Starting position 2  

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

[Diagram]
Roll up  

W1 is again a sacrifice stone, meant to reduce Black's liberties. If B2, then W3 is atari and when B4 connects at W1, W5 completes the roll up.

[Diagram]
Sacrifice needed  

Note that the sacrifice is needed: if W1 simply ataris, B2 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.


Roll-up last edited by Dieter on April 24, 2014 - 17:22
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