triple ko

Talk about improving your game, resources you like, games you played, etc.
Post Reply
nasdaq
Dies in gote
Posts: 53
Joined: Thu Jan 05, 2017 4:34 pm
Rank: 1k
GD Posts: 0
Has thanked: 3 times
Been thanked: 9 times

triple ko

Post by nasdaq »

Hi,

I was looking over a game I played and was messing about with variations in the lower left.

https://imgur.com/a/8WKgR

I somehow managed to create a triple ko.

So both groups have an outside ko and there is an internal ko between both.

Am I right in thinking that if either side plays away then the opponent can fill in the others external ko.

This would make it an external ko and direct ko between groups. So it would be a loss for the player who played away since its life due to double ko.

Ko's are so confusing! especially multiple between groups.

Question : If this happened on a go server would both parties just ask for a draw (if the ko was big enough that to lose it would lose the game) ?

I had a look here https://senseis.xmp.net/?DoubleKo but not sure what kind of example I have in my image.

Thanks. Mybe I've missed something...
User avatar
EdLee
Honinbo
Posts: 8859
Joined: Sat Apr 24, 2010 6:49 pm
GD Posts: 312
Location: Santa Barbara, CA
Has thanked: 349 times
Been thanked: 2070 times

Post by EdLee »

Click Here To Show Diagram Code
[go]$$W
$$ | . . . . . . . . . . . . . . .
$$ | X X . . . . . . . . . . . . .
$$ | . X X X O O O . . . . . . . .
$$ | X X O O X X O . O , . . . . .
$$ | X . X O . X O . . . . . . . .
$$ | X X O O X X X O O . . . . . .
$$ | . X O . O X . B O . . . . . .
$$ -------------------------------[/go]
Click Here To Show Diagram Code
[go]$$W
$$ | . . . . . . . . . . . . . . .
$$ | X X . . . . . . . . . . . . .
$$ | . X X X O O O . . . . . . . .
$$ | X X O O X X O . O , . . . . .
$$ | X 1 . O . X O . . . . . . . .
$$ | X X O O X X X O O . . . . . .
$$ | . X O 2 . X 3 . O . . . . . .
$$ -------------------------------[/go]
Click Here To Show Diagram Code
[go]$$W Cycle
$$ | . . . . . . . . . . . . . . .
$$ | X X . . . . . . . . . . . . .
$$ | . X X X O O O . . . . . . . .
$$ | X X O O X X O . O , . . . . .
$$ | X . 4 O . X O . . . . . . . .
$$ | X X O O X X X O O . . . . . .
$$ | . X O . 5 X . 6 O . . . . . .
$$ -------------------------------[/go]
nasdaq
Dies in gote
Posts: 53
Joined: Thu Jan 05, 2017 4:34 pm
Rank: 1k
GD Posts: 0
Has thanked: 3 times
Been thanked: 9 times

Re: triple ko

Post by nasdaq »

Thanks EdLee!

So if the player instead of retake their external ko after the forced 3 move sequence. decides to try and kill, then it turns into a real ko and they have to find the first ko threat. hmmm,
User avatar
EdLee
Honinbo
Posts: 8859
Joined: Sat Apr 24, 2010 6:49 pm
GD Posts: 312
Location: Santa Barbara, CA
Has thanked: 349 times
Been thanked: 2070 times

Post by EdLee »

Seems: if one side is losing, then no-result is better than a loss ;
if one side is winning, then they have to count the ko threats to decide between ko or no-result ? :)
Uberdude
Judan
Posts: 6727
Joined: Thu Nov 24, 2011 11:35 am
Rank: UK 4 dan
GD Posts: 0
KGS: Uberdude 4d
OGS: Uberdude 7d
Location: Cambridge, UK
Has thanked: 436 times
Been thanked: 3718 times

Re: triple ko

Post by Uberdude »

There was a famous game in the Samsung cup semi-final (deciding 3rd game) by Luo Xihe against Choi Cheolhan where he had a triple ko and could have gone for a no result, instead he generated big ko threats and turned it into a real ko, which he then lost, but got enough elsewhere to win (he'd also picked up quite some profit in the buildup to the triple ko semeai). Mr GoCommentary.com did a nice video review: http://www.gocommentary.com/free-videos ... olhan.html. Amazing game.
Pio2001
Lives in gote
Posts: 418
Joined: Mon Feb 16, 2015 12:13 pm
Rank: kgs 5 kyu
GD Posts: 0
KGS: Pio2001
Has thanked: 9 times
Been thanked: 83 times

Re: triple ko

Post by Pio2001 »

It seems to me that it behaves like a triple ko.

In Japanese rule, if one of the players plays elsewhere, he dies. So the cycle is forced.
In a server, an admin must be called.

In AGA, French and British rule, it behaves like a normal ko.

In Chinese rules, the players can choose to play the ko or call an admin,

Not sure about SST or New Zealand rules.
Post Reply