Throw-in ko

  Difficulty: Beginner   Keywords: Ko

Throw-in moves are a common technique both to create kos - which is explained here - or to capture a ko first.

Throw-in for ko  

In the endgame Black can throw in at B1 and start a ko here. First Black plays B1, and White must take with W2.


Then Black plays B3 and White is in no position to connect. White has to start the ko by capturing B3. It is however hard for White to resist: large threats are required.

Black's ko victory  

Black has a follow-up at a which is substantial, once Black has captured to win the ko (marked stone). If White just connects at a Black has of course taken profit in sente here (and then can return to answer White's threat).

No profit  

Simply playing B1 here makes this area all neutral points, which is much inferior for Black.

--Charles Matthews

Like a 10,000 year ko  

Black makes a throw-in at B1 to make the ko. White could make the ko with a throw-in at W2. Black could also make seki by playing B2 instead of B1.

This position is like a ten thousand year ko because whoever makes the ko, the opponent takes it first, and one player can make seki.

Black can change his mind about the seki and make a ko by sacrificing three stones. See Sending Three Returning One.

Throw-in ko last edited by tapir on December 7, 2011 - 15:46
RecentChanges · StartingPoints · About
Edit page ·Search · Related · Page info · Latest diff
[Welcome to Sensei's Library!]
Search position
Page history
Latest page diff
Partner sites:
Go Teaching Ladder
Login / Prefs
Sensei's Library