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Offline Gomoto
 Post subject: Gomoto's Life and Death
Post #1 Posted: Wed Mar 07, 2018 3:10 pm 
Gosei

Posts: 1733
Location: Earth
Liked others: 621
Was liked: 310
First Gomoto lives and then he dies.

But now what about Gomoto's groups:

Problem 1: Black to play or stay (away)

Click Here To Show Diagram Code
[go]$$B
$$ ------------+
$$ O X . . . . |
$$ O X . . . . |
$$ O X X X X X |
$$ O O O O O O |[/go]


Tenuki or not Tenuki?
What is your move and how much is it worth?

Hint:
I know this shape is alive from Cho Chikun's All About Life and Death (88). But when it arised in my game I learned there is more to consider than life and death in a real game.
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Offline Gomoto
 Post subject: Re: Gomoto's Life and Death
Post #2 Posted: Fri Mar 09, 2018 10:11 am 
Gosei

Posts: 1733
Location: Earth
Liked others: 621
Was liked: 310
Think about current score, ko, seki and tenuki.

Solution:

Options:

Tenuki
0 points for black (seki)
Click Here To Show Diagram Code
[go]$$W
$$ ------------+
$$ O X 6 4 2 . |
$$ O X . 1 3 5 |
$$ O X X X X X |
$$ O O O O O O |[/go]


or
? points for ? (tenthousand year ko)
Click Here To Show Diagram Code
[go]$$W
$$ ------------+
$$ O X . 5 2 . |
$$ O X . 1 3 4 |
$$ O X X X X X |
$$ O O O O O O |[/go]


Play a move:
7 points for black
Click Here To Show Diagram Code
[go]$$B
$$ ------------+
$$ O X . . . . |
$$ O X . B . . |
$$ O X X X X X |
$$ O O O O O O |[/go]


Last edited by Gomoto on Fri Mar 09, 2018 10:33 am, edited 1 time in total.
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Offline Gomoto
 Post subject: Re: Gomoto's Life and Death
Post #3 Posted: Fri Mar 09, 2018 10:26 am 
Gosei

Posts: 1733
Location: Earth
Liked others: 621
Was liked: 310
Now a whole board problem, 6.5 komi: (black to play)

Click Here To Show Diagram Code
[go]$$B
$$ ---------------------------------------
$$ | . . X X O . . . . O X X . . . . . X X |
$$ | . . X O . O O . O . O X X . . . X X O |
$$ | . . X O O O . O O O . O X X . X X O O |
$$ | . . X O X O . . O , O O X . . X O O . |
$$ | X X X X X X O O . O X X . . X O O O O |
$$ | O X O X X O . O O X . X . . X X O . O |
$$ | O X O O X O O X O X X . . O O O X O O |
$$ | O O O . O . O X O O X . . . . X X O X |
$$ | O X O . O . O X X O X . . . X . O X X |
$$ | . X . , X O O O X X . . . . . , O X X |
$$ | . . X X . . O X X . . . . . . . X . X |
$$ | . . X O O . O O X . . . . . . X . X . |
$$ | . X . X O . . O O X X X . . . X O . . |
$$ | . O X O . . . . O O O X . . . . . . . |
$$ | . . O . O O . . O X O X . . . . . O . |
$$ | . O O O X O . . . X O X O . . X X . . |
$$ | O O X X X X O O . . O O X X . . . . . |
$$ | O X . . X X X O O . O X X . . . . . . |
$$ | . X . O . X O O . O X X . . . . . . . |
$$ ---------------------------------------[/go]


What is your move black? :shock:
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Offline Gomoto
 Post subject: Re: Gomoto's Life and Death
Post #4 Posted: Tue Mar 13, 2018 7:10 am 
Gosei

Posts: 1733
Location: Earth
Liked others: 621
Was liked: 310
Solution:

resign :blackeye:


Verbose Solution:
If black adds a (necessary) stone in the upper left he is loosing by 0.5 points
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