cutting problem

Kirby · **#21**

paK0 wrote:

Kirby wrote:

Fair enough, illluck. I am personally still not sure what to believe. Even if it were for pedagogical reasons, I'm surprised that a solution to a pro's problem would be sub-optimal.

Its probably common that go books have tons of mistakes, regardless of the author. A ton of chess books that were written before the time that computers got this strong got updates in their more recent versions because they contained unsound lines that were thought to be correct.

Agreed, but I feel it is more likely that we, as amateurs, missed something :-)

illluck · **#22**

ez4u wrote:

It is true that either play will cut. However, it is not correct to think that White will go ahead and play out the situation at this time. Consider the implications of :w1:

in the two diagrams below. White waits to see whether this can turn into an important play in the center. The exchange of the marked stones in the first diagram eliminates any aji here. It is indeed the better sequence.

Click Here To Show Diagram Code: [go]$$Wc If Black has to answer in the center 1 $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . 2 . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . O . . . . . . . . . . . . | $$ | . . . O O . . . 1 . . . . . . . . . . | $$ | . . . X . O . . . X . . . . . . . . . | $$ | . . . X . W B . X . . . . . . . . . . | $$ | . . . X . O 6 O X . . . . . . . . . . | $$ | . . . X 4 X 3 X X , . . . . . , . . . | $$ | . . . X . O 5 . . X . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Click Here To Show Diagram Code: [go]$$Wc If Black has to answer in the center 2 $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . 2 . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . O . . . . . . . . . . . . | $$ | . . . O O . . . 1 . . . . . . . . . . | $$ | . . . X . O a 0 c X . . . . . . . . . | $$ | . . . X b 8 6 9 X . . . . . . . . . . | $$ | . . . X . O 7 O X . . . . . . . . . . | $$ | . . . X 4 X 3 X X , . . . . . , . . . | $$ | . . . X . O 5 . . X . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Sure, but then the double peep doesn't have to be answered either and that aji still remains. Though the double peep does threaten a slightly bigger capture.

Kirby · **#23**

Thanks for the diagrams, ez4u. I think that your explanation at least gives one example where the first variation makes more sense.

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