Mutual ko threat

  Difficulty: Intermediate   Keywords: Ko, Go term

A mutual ko threat is a local position in which either player, moving first, has a ko threat, such that playing the threat removes the other player's threat. Usually a mutual threat is a miai in which each player makes a play, regardless of who plays first.

[Diagram]
Miai example 1  

In this position, a and b are miai, Both players must get one of them in order to live. Either by getting two eyes or by getting seki. If it is White's turn to find a threat, white can play b, to which black must respond a, or a, to which black must respond b. The same goes for black


[Diagram]
Miai example 2  

In this position Black typically gets a and White gets b. Either Ba or Wb may be used as a ko threat, threatening to gain 6 points in two moves.


At times, the double ko threat is one in which the same play by either player carries a threat.

[Diagram]
Same move example  

In this example, a is a mutual ko threat. When either player plays at a, it threatens kill the other player's group by cutting it into two.


Typically a player should play the mutual ko threats before starting a ko fight, to prevent the opponent from playing them. So these "double threats" don't normally play any part in ko fights. See remove double threats before you first capture the ko.


Mutual ko threat last edited by 80.6.183.4 on January 4, 2017 - 18:27
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