Life In 19x19 :: Question about a Tesuji problem

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Question about a Tesuji problem http://lifein19x19.com/viewtopic.php?f=12&t=15172	Page 1 of 1

Author: mongus [ Sun Nov 19, 2017 3:19 pm ]

Post subject: Question about a Tesuji problem

In James Davies Tesuji there is a particular problem regarding a capture race:

White to play

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

The solution given is :

Click Here To Show Diagram Code: [go]$$W $$ . . . . . . . . . . . . | $$ . . . . . . . . . X . . | $$ . . , . O O X X X . . . | $$ . . O O X X O O X O X . | $$ . . O X . X . O O X X . | $$ . . . 5 3 2 1 . 4 . . . | $$ ------------------------+[/go]

Where 2 and 3 are miai (maybe I am not understanding this).

I can't quite see what the solution would be if Black played :

Click Here To Show Diagram Code: [go]$$W $$ . . . . . . . . . . . . | $$ . . . . . . . . . X . . | $$ . . , . O O X X X . . . | $$ . . O O X X O O X O X . | $$ . . O X . X . O O X X . | $$ . . . . 2 . 1 . . . . . | $$ ------------------------+[/go]

If White then plays :w3:

black can just counter with :b4:

. Now White cannot play the marked point due to a shortage of liberties:

Click Here To Show Diagram Code: [go]$$W $$ . . . . . . . . . . . . | $$ . . . . . . . . . X . . | $$ . . , . O O X X X . . . | $$ . . O O X X O O X O X . | $$ . . O X . X M O O X X . | $$ . . . . 2 3 1 . 4 . . . | $$ ------------------------+[/go]

Black then wins the capture race :

Click Here To Show Diagram Code: [go]$$W $$ . . . . . . . . . . . . | $$ . . . . . . . . . X . . | $$ . . , . O O X X X . . . | $$ . . O O X X O O X O X . | $$ . . O X . X . O O X X . | $$ . . 5 7 2 3 1 8 4 6 . . | $$ ------------------------+[/go]

If White tries to come in from the other side, they still lose :

Click Here To Show Diagram Code: [go]$$W $$ . . . . . . . . . . . . | $$ . . . . . . . . . X . . | $$ . . , . O O X X X . . . | $$ . . O O X X O O X O X . | $$ . . O X . X . O O X X . | $$ . . 3 5 2 7 1 8 4 6 . . | $$ ------------------------+[/go]

Not quite sure what I am missing. Is there a problem with the problem or a problem with my problem solving?

Author:	Kirby [ Sun Nov 19, 2017 4:19 pm ]
Post subject:	Re: Question about a Tesuji problem
I think your analysis is correct.

Author:	Pio2001 [ Sun Nov 19, 2017 5:25 pm ]
Post subject:	Re: Question about a Tesuji problem
I think that after White 1 Black 2, the right move for White is to play at Black 4.

Author:	Kirby [ Sun Nov 19, 2017 6:28 pm ]
Post subject:	Re: Question about a Tesuji problem
Pio2001 wrote: I think that after White 1 Black 2, the right move for White is to play at Black 4. Click Here To Show Diagram Code `[go]$$W $$ . . . . . . . . . . . . \| $$ . . . . . . . . . X . . \| $$ . . , . O O X X X . . . \| $$ . . O O X X O O X O X . \| $$ . . O X . X 4 O O X X . \| $$ . . . . 2 . 1 . 3 . . . \| $$ ------------------------+[/go]`

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