Life In 19x19

Posted: **Tue Aug 30, 2016 2:55 am**

Click Here To Show Diagram Code: [go]$$Wm66 19x19 board $$ --------------------------------------- $$ | . . . . . . . . . . . X . . . . . . . | $$ | . . O . . . . O M O X . X . . . . . . | $$ | . O . . O O 3 X X 1 O X X . X X . . . | $$ | . . X , O X X . . , . O O . O , . . . | $$ | . . . X 2 . . O O O O . . . . . X . . | $$ | . . . . . . . X O X X . . . O O X . . | $$ | . . . . . X . X X O X . . X . . X . . | $$ | . . . . . . . . . O . X . X O . O . . | $$ | . . . . . . . . O . . . . . O . . . . | $$ | . . X , . . . . . , . . X . X X X . . | $$ | . . . . . . . . O . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

The commentary explains that this sequence guarantees the white top group is connected to the upper left corner group. However, when I put 67 at the red x instead of where it's played I can't seem to see how white will connect. I've tried playing out a number of lines on a board but can't find one to work for white. The best I can do is in some lines a ko where white tries to connect under the red x and then black starts a ko to the right along the edge.

Anyways, any thoughts as to how white connects in that case would be appreciated.

Posted: **Tue Aug 30, 2016 3:05 am**

Well, this is the simplest if white doesn't want to fight the ko.

Click Here To Show Diagram Code: [go]$$Wm66 19x19 board $$ --------------------------------------- $$ | . . . . . . . 4 1 2 . X . . . . . . . | $$ | . . O . . . . O X O X . X . . . . . . | $$ | . O . . O O O X X O O X X . X X . . . | $$ | . . X , O X X 3 . , . O O . O , . . . | $$ | . . . X X 5 . O O O O . . . . . X . . | $$ | . . . . . . . X O X X . . . O O X . . | $$ | . . . . . X . X X O X . . X . . X . . | $$ | . . . . . . . . . O . X . X O . O . . | $$ | . . . . . . . . O . . . . . O . . . . | $$ | . . X , . . . . . , . . X . X X X . . | $$ | . . . . . . . . O . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Posted: **Tue Aug 30, 2016 3:12 am**

You have an extra stone in your diagram. You have 68 played as an unmarked and then another 68.

Sorry, the numbers in your diagram are confusing, not sure if you have the right stones on or not.

Posted: **Tue Aug 30, 2016 3:16 am**

DrStraw, I think globulon is asking how white should play now:

Click Here To Show Diagram Code: [go]$$Wm66 19x19 board $$ --------------------------------------- $$ | . . . . . . . . . . . X . . . . . . . | $$ | . . O . . . . O 2 O X . X . . . . . . | $$ | . O . . O O . X X 1 O X X . X X . . . | $$ | . . X , O X X . . , . O O . O , . . . | $$ | . . . X . . b O O O O . . . . . X . . | $$ | . . . . . . a X O X X . . . O O X . . | $$ | . . . . . X . X X O X . . X . . X . . | $$ | . . . . . . . . . O . X . X O . O . . | $$ | . . . . . . . . O . . . . . O . . . . | $$ | . . X , . . . . . , . . X . X X X . . | $$ | . . . . . . . . O . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

I don't have the answer yet, but it might be white doesn't connect but comes out around a/b as black has some weakness there and that is also a successful result. So I wouldn't approach this as "find white an unconditional connect", but "find white a satisfactory result if black insists on disconnecting".

Posted: **Tue Aug 30, 2016 3:18 am**

Yes, thanks Uberdude.

Posted: **Tue Aug 30, 2016 8:06 am**

Maybe like this? 72 for 73 exchange is sente (though the kind of inside for outside move you prefer not to make unless needed) and means black is short of libs to cut. Black gets some points on top side but gets thin outside and would need to defend with something like a afterwards.

Click Here To Show Diagram Code: [go]$$Wm66 19x19 board $$ --------------------------------------- $$ | . . . . . . . 0 3 . . X . . . . . . . | $$ | . . O . . . 4 O 2 O X . X . . . . . . | $$ | . O . . O O 5 X X 1 O X X . X X . . . | $$ | . . X , O X X 6 . , . O O . O , . . . | $$ | . . . X . 9 . O O O O . . . . . X . . | $$ | . . . . . . 7 X O X X . . . O O X . . | $$ | . . . . . X 8 X X O X . . X . . X . . | $$ | . . . . . . . . . O . X . X O . O . . | $$ | . . . . . . . . O . . . . . O . . . . | $$ | . . X , . . . . . , . . X . X X X . . | $$ | . . . . . . . . O . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Click Here To Show Diagram Code: [go]$$Wm76 19x19 board $$ --------------------------------------- $$ | . . . . . . . X O 2 . X . . . . . . . | $$ | . . O . . . X . X O X . X . . . . . . | $$ | . O . . O O O X X O O X X . X X . . . | $$ | . . X , O X X X . , . O O . O , . . . | $$ | . . . X 3 O 1 O O O O . . . . . X . . | $$ | . . . . . . O X O X X . . . O O X . . | $$ | . . . a . X X X X O X . . X . . X . . | $$ | . . . . . . . . . O . X . X O . O . . | $$ | . . . . . . . . O . . . . . O . . . . | $$ | . . X , . . . . . , . . X . X X X . . | $$ | . . . . . . . . O . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

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