Dame Ko Threats

   

A dame ko threat is a move played during a ko on what would be dame under Japanese rules, however if the game is being played using Chinese rules, in some circumstances it could be important to answer it.

Quick rules of thumb for the komaster

  • Its never wrong to answer an opponents dame ko threat, provided that doing so doesn't cause you to run out of ko treats (better than threats!).
  • If there an odd number of dame, its safe to ignore a dame ko threat. (This is exactly the opposite of what seems 'intuitive').
  • Instead of filling the ko, its never wrong to take a dame, provided that doing so doesn't cause you to run out of ko threats.

The following game uses Chinese counting, with 0.5 points komi. In order to win, white must win the ko and not let black get 2 points more than white in the dame.

[Diagram]
Black to play  
[Diagram]
B wins by 0.5  
[Diagram]
W wins by 1.5  

White 6 at white+triangle, black passes then white plays at B3 to win by 1.5
Here there are 3 dame, and white has one more point than before. In this case white need not answer a black dame ko threats as black can only gain 1 point that way.

[Diagram]
 
[Diagram]
 
[Diagram]
W wins by 1.5  


It doesn't affect the score if white answers B7 at W6. Black may take the ko instead of B7, but it doesn't help as white has has triangle.

[Diagram]
W wins by 1.5  

There is a [ext] general study of all cases with only basic kos and dame under area scoring.


Dame Ko Threats last edited by 2.220.249.93 on December 23, 2012 - 22:05
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