Again, I almost stumbled into disaster.
He has one eye, and if he gets another, his group lives and he wins the game.
I can't let him capture D7 and make an eye there.
The natural move to play is this. It seems to be the most direct method of connecting D7 out:
- Click Here To Show Diagram Code
[go]$$Bcm101 Prisoners:
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . O . X . . O . . . . X . O . . |
$$ | . O . O . . . . X O . X . . . , X O . |
$$ | . . O O X X . . X O . . . . X . X . . |
$$ | . O . . O X . . . . O . O . . . . . . |
$$ | . X O O O X . O O . . . . . . . . . . |
$$ | . . X X X X X . . . . . . X . . X . . |
$$ | . . . . . O . . O . . . O X . O X . . |
$$ | . X . X X . X X O , . O . O O , . . . |
$$ | . O O O O O . . O . . . O . . X . . . |
$$ | . . . . . . X X . . . . . . . . X . . |
$$ | O O O B . 3 . . . . . . . . . . . . . |
$$ | X X O . . 2 . . . X . . . O . . O . . |
$$ | 1 X O . . . . . . . . O . . . . . . . |
$$ | X O O X . X . . . , . . . . . O . . . |
$$ | X X X . . . . . X X . O . X . . . . . |
$$ | . . . . . . . . X O O . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
But it doesn't work.
White plays like this:
- Click Here To Show Diagram Code
[go]$$Bcm101
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . O . X . . O . . . . X . O . . |
$$ | . O . O . . . . X O . X . . . , X O . |
$$ | . . O O X X . . X O . . . . X . X . . |
$$ | . O . . O X . . . . O . O . . . . . . |
$$ | . X O O O X . O O . . . . . . . . . . |
$$ | . . X X X X X . . . . . . X . . X . . |
$$ | . . . . . O . . O . . . O X . O X . . |
$$ | . X . X X . X X O , . O . O O , . . . |
$$ | . O O O O O . . O . . . O . . X . . . |
$$ | . . . . . . X X . . . . . . . . X . . |
$$ | O O O X 4 3 . . . . . . . . . . . . . |
$$ | X X O . . 2 . . . X . . . O . . O . . |
$$ | 1 X O . . . . . . . . O . . . . . . . |
$$ | X O O X . X . . . , . . . . . O . . . |
$$ | X X X . . . . . X X . O . X . . . . . |
$$ | . . . . . . . . X O O . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
I can't play 5 above, or he gets the second eye:
- Click Here To Show Diagram Code
[go]$$Bcm101 The circled points are miai
$$ | . X . X X . X X O , . O . O O , . . . |
$$ | . O O O O O . . O . . . O . . X . . . |
$$ | . . . C 5 C X X . . . . . . . . X . . |
$$ | O O O X 4 3 . . . . . . . . . . . . . |
$$ | X X O . 6 2 . . . X . . . O . . O . . |
$$ | 1 X O . . . . . . . . O . . . . . . . |
$$ | X O O X . X . . . , . . . . . O . . . |
$$ | X X X . . . . . X X . O . X . . . . . |
$$ | . . . . . . . . X O O . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
So I must atari with 5 from below. He connects with 6, and I must connect with 7:
- Click Here To Show Diagram Code
[go]$$Bcm101
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . O . X . . O . . . . X . O . . |
$$ | . O . O . . . . X O . X . . . , X O . |
$$ | . . O O X X . . X O . . . . X . X . . |
$$ | . O . . O X . . . . O . O . . . . . . |
$$ | . X O O O X . O O . . . . . . . . . . |
$$ | . . X X X X X . . . . . . X . . X . . |
$$ | . . . . . O . . O . . . O X . O X . . |
$$ | . X . X X . X X O , . O . O O , . . . |
$$ | . O O O O O . . O . . . O . . X . . . |
$$ | . . . . 6 . X X . . . . . . . . X . . |
$$ | O O O X 4 3 . . . . . . . . . . . . . |
$$ | X X O 7 5 2 . . . X . . . O . . O . . |
$$ | 1 X O . . . . . . . . O . . . . . . . |
$$ | X O O X . X . . . , . . . . . O . . . |
$$ | X X X . . . . . X X . O . X . . . . . |
$$ | . . . . . . . . X O O . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
All of that is simple and forced. I must play it or he gets an eye at D7.
Next, white cuts at 8:
- Click Here To Show Diagram Code
[go]$$Bcm1
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . O . X . . O . . . . X . O . . |
$$ | . O . O . . . . X O . X . . . , X O . |
$$ | . . O O X X . . X O . . . . X . X . . |
$$ | . O . . O X . . . . O . O . . . . . . |
$$ | . X O O O X . O O . . . . . . . . . . |
$$ | . . X X X X X . . . . . . X . . X . . |
$$ | . . . . . O . . O . . . O X . O X . . |
$$ | . X . X X . X X O , . O . O O , . . . |
$$ | . O O O O O . . O . . . O . . X . . . |
$$ | . . . . 6 . X X . . . . . . . . X . . |
$$ | O O O X 4 3 . . . . . . . . . . . . . |
$$ | X X O 7 5 2 . . . X . . . O . . O . . |
$$ | 1 X O 0 . . . . . . . O . . . . . . . |
$$ | X O O X . X . . . , . . . . . O . . . |
$$ | X X X 8 . . . . X X . O . X . . . . . |
$$ | . . . 9 . . . . X O O . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
I can't let him play 9 or he will kill my corner.
Now with 10 he threatens both my single stone and my group of three. I must rescue the three, or he makes an eye there.
[ The really sharp-eyed observer may note that a different play here leads to a ko, but that isn't much of an improvement for me since he has a bunch of internal ko threats. ]
- Click Here To Show Diagram Code
[go]$$Bcm1
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . O . X . . O . . . . X . O . . |
$$ | . O . O . . . . X O . X . . . , X O . |
$$ | . . O O X X . . X O . . . . X . X . . |
$$ | . O . . O X . . . . O . O . . . . . . |
$$ | . X O O O X . O O . . . . . . . . . . |
$$ | . . X X X X X . . . . . . X . . X . . |
$$ | . . . . . O . . O . . . O X . O X . . |
$$ | . X . X X . X X O , . O . O O , . . . |
$$ | . O O O O O . . O . . . O . . X . . . |
$$ | . . . . O . X X . . . . . . . . X . . |
$$ | O O O X O X . . . . . . . . . . . . . |
$$ | X X O X X O . . . X . . . O . . O . . |
$$ | X X O O 1 . . . . . . O . . . . . . . |
$$ | X O O X 2 X . . . , . . . . . O . . . |
$$ | X X X O . . . . X X . O . X . . . . . |
$$ | . . . X . . . . X O O . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
He captures my single stone. It is a false eye, of course, so I'm still in the game.
I play 3 which will gain some leverage in the future. ( More on that later ) His reply at 4 is forced. Then I save my three stones with 5. He still only has one eye.
- Click Here To Show Diagram Code
[go]$$Bcm1
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . O . X . . O . . . . X . O . . |
$$ | . O . O . . . . X O . X . . . , X O . |
$$ | . . O O X X . . X O . . . . X . X . . |
$$ | . O . . O X . . . . O . O . . . . . . |
$$ | . X O O O X . O O . . . . . . . . . . |
$$ | . . X X X X X . . . . . . X . . X . . |
$$ | . . . . . O . . O . . . O X . O X . . |
$$ | . X . X X . X X O , . O . O O , . . . |
$$ | . O O O O O . . O . . . O . . X . . . |
$$ | . . . . O . X X . . . . . . . . X . . |
$$ | O O O X O X . . . . . . . . . . . . . |
$$ | X X O X X O . . . X . . . O . . O . . |
$$ | X X O O 1 5 . . . . . O . . . . . . . |
$$ | X O O 4 2 X . . . , . . . . . O . . . |
$$ | X X X O 3 . . . X X . O . X . . . . . |
$$ | . . . X . . . . X O O . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Then he cuts off my corner with 6:
- Click Here To Show Diagram Code
[go]$$Bcm1
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . O . X . . O . . . . X . O . . |
$$ | . O . O . . . . X O . X . . . , X O . |
$$ | . . O O X X . . X O . . . . X . X . . |
$$ | . O . . O X . . . . O . O . . . . . . |
$$ | . X O O O X . O O . . . . . . . . . . |
$$ | . . X X X X X . . . . . . X . . X . . |
$$ | . . . . . O . . O . . . O X . O X . . |
$$ | . X . X X . X X O , . O . O O , . . . |
$$ | . O O O O O . . O . . . O . . X . . . |
$$ | . . . . O . X X . . . . . . . . X . . |
$$ | O O O X O X . . . . . . . . . . . . . |
$$ | X X O X X O . . . X . . . O . . O . . |
$$ | X X O O 1 5 . . . . . O . . . . . . . |
$$ | X O O 4 2 X . . . , . . . . . O . . . |
$$ | X X X O 3 . . . X X . O . X . . . . . |
$$ | . . 7 X 6 . . . X O O . . . . O . . . |
$$ | . C . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
I could play 7 at C1 or D1. It does not get any better. My corner is cut off and still needs another move to have two eyes.
Note that if I had not sacrificed at 3, he could now play 8 at B1, killing my corner.
- Click Here To Show Diagram Code
[go]$$Bcm1
$$ | O O O X O X . . . . . . . . . . . . . |
$$ | X X O X X O . . . X . . . O . . O . . |
$$ | X X O O 1 5 . . . . . O . . . . . . . |
$$ | X O O . 2 X . . . , . . . . . O . . . |
$$ | X X X O . . . . X X . O . X . . . . . |
$$ | . . 7 X 6 . . . X O O . . . . O . . . |
$$ | . 8 . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
But with 3 in place, he can't:
- Click Here To Show Diagram Code
[go]$$Bcm1 Black kills white 6 to save his corner
$$ | O O O X O X . . . . . . . . . . . . . |
$$ | X X O X X O . . . X . . . O . . O . . |
$$ | X X O O 1 5 . . . . . O . . . . . . . |
$$ | X O O 4 2 X . . . , . . . . . O . . . |
$$ | X X X O 3 9 . . X X . O . X . . . . . |
$$ | . . 7 X 6 . . . X O O . . . . O . . . |
$$ | . 8 . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
So white has to pause to capture black 3 with 8, and black gets another move to save his corner:
- Click Here To Show Diagram Code
[go]$$Bcm1
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . O . X . . O . . . . X . O . . |
$$ | . O . O . . . . X O . X . . . , X O . |
$$ | . . O O X X . . X O . . . . X . X . . |
$$ | . O . . O X . . . . O . O . . . . . . |
$$ | . X O O O X . O O . . . . . . . . . . |
$$ | . . X X X X X . . . . . . X . . X . . |
$$ | . . . . . O . . O . . . O X . O X . . |
$$ | . X . X X . X X O , . O . O O , . . . |
$$ | . O O O O O . . O . . . O . . X . . . |
$$ | . . . . O . X X . . . . . . . . X . . |
$$ | O O O X O X . . . . . . . . . . . . . |
$$ | X X O X X O . . . X . . . O . . O . . |
$$ | X X O O 1 5 . . . . . O . . . . . . . |
$$ | X O O 4 2 X . . . , . . . . . O . . . |
$$ | X X X O C 8 . . X X . O . X . . . . . |
$$ | . . 7 X 6 . . . X O O . . . . O . . . |
$$ | . 9 . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Having reached the edge of the board, white tries to use it to make an eye:
- Click Here To Show Diagram Code
[go]$$Bcm1
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . O . X . . O . . . . X . O . . |
$$ | . O . O . . . . X O . X . . . , X O . |
$$ | . . O O X X . . X O . . . . X . X . . |
$$ | . O . . O X . . . . O . O . . . . . . |
$$ | . X O O O X . O O . . . . . . . . . . |
$$ | . . X X X X X . . . . . . X . . X . . |
$$ | . . . . . O . . O . . . O X . O X . . |
$$ | . X . X X . X X O , . O . O O , . . . |
$$ | . O O O O O . . O . . . O . . X . . . |
$$ | . . . . O . X X . . . . . . . . X . . |
$$ | O O O X O X . . . . . . . . . . . . . |
$$ | X X O X X O . . . X . . . O . . O . . |
$$ | X X O O 1 5 . . . . . O . . . . . . . |
$$ | X O O 4 2 X . . . , . . . . . O . . . |
$$ | X X X O C 8 . . X X . O . X . . . . . |
$$ | . . 7 X 6 . 0 . X O O . . . . O . . . |
$$ | . 9 . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Normally, black could prevent an eye here:
- Click Here To Show Diagram Code
[go]$$Bcm1
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . O . X . . O . . . . X . O . . |
$$ | . O . O . . . . X O . X . . . , X O . |
$$ | . . O O X X . . X O . . . . X . X . . |
$$ | . O . . O X . . . . O . O . . . . . . |
$$ | . X O O O X . O O . . . . . . . . . . |
$$ | . . X X X X X . . . . . . X . . X . . |
$$ | . . . . . O . . O . . . O X . O X . . |
$$ | . X . X X . X X O , . O . O O , . . . |
$$ | . O O O O O . . O . . . O . . X . . . |
$$ | . . . . O . X X . . . . . . . . X . . |
$$ | O O O X O X . . . . . . . . . . . . . |
$$ | X X O X X O . . . X . . . O . . O . . |
$$ | X X O O X X . . . . . O . . . . . . . |
$$ | X O O . O X . . . , . . . . . O . . . |
$$ | X X X O . O . . X X . O . X . . . . . |
$$ | . . X X O . O . X O O . . . . O . . . |
$$ | . X . . 4 1 2 . 3 . . . . . . . . . . |
$$ ---------------------------------------[/go]
But 2 threatens to connect underneath, so white gets the second eye - and the game.