[go]$$Bc Black to play: Black is separated into three groups, the only way to connect is to capture the three white stones in the middle. What is the correct way to utilize white's cutting points? $$ ------------------- $$ | . . . . . . . . . . . . $$ | . . . O . . . . . . . . $$ | . . O . . . . . . . . . $$ | . . O X X X . . . . . . $$ | . X X O . . . O . . . . $$ | . . . O . O . . . . . . $$ | . X X O . X O . . . . . $$ | . . O X X . . . . . . . $$ | . . O . . . . . . . . . $$ | . . . O . . . . . . . . $$ | . . . . . . . . . . . . $$ | . . . . . . . . . . . .[/go]
[go]$$Bc Solution: The cut at 1 is the correct way to make use of white's cutting points. After the exchange of 2 to 3, the atari at 4 is white's strongest resistance, but in the sequence up to 9, white is caught in a connect-and-die. $$ ------------------- $$ | . . . . . . . . . . . . $$ | . . . O . . . . . . . . $$ | . . O . . . . . . . . . $$ | . . O X X X . . . . . . $$ | . X X O 6 7 4 O . . . . $$ | . . 9 O 5 O 1 8 . . . . $$ | . X X O 2 X O . . . . . $$ | . . O X X 3 . . . . . . $$ | . . O . . . . . . . . . $$ | . . . O . . . . . . . . $$ | . . . . . . . . . . . . $$ | . . . . . . . . . . . .[/go]
[go]$$Bc Not a failure: Black captures the three stones. $$ ------------------- $$ | . . . . . . . . . . . . $$ | . . . O . . . . . . . . $$ | . . O . . . . . . . . . $$ | . . O X X X . . . . . . $$ | . X X O 2 . . O . . . . $$ | . . . O 1 O 3 . . . . . $$ | . X X O . X O . . . . . $$ | . . O X X . . . . . . . $$ | . . O . . . . . . . . . $$ | . . . O . . . . . . . . $$ | . . . . . . . . . . . . $$ | . . . . . . . . . . . .[/go]
So, satisfied that I understood the question, I responded saying that indeed something is off with the problem - it is off-the-mark as it has 2 solutions (generally frowned upon). It's a bit amusing how certain the comments were about the failure, but mistakes such as this are understandable in any large collection of problems.
It turns out I was wrong, though:
Another poster pointed out that in fact the "solution" isn't correct either! Black cannot capture white with the cut.
[go]$$Bc Not a solution: "a" and "b" are miai. $$ ------------------- $$ | . . . . . . . . . . . . $$ | . . . O . . . . . . . . $$ | . . O . . . . . . . . . $$ | . . O X X X . . . . . . $$ | . X X O . . a O . . . . $$ | . . . O 2 O 1 . . . . . $$ | . X X O . X O . . . . . $$ | . . O X X b . . . . . . $$ | . . O . . . . . . . . . $$ | . . . O . . . . . . . . $$ | . . . . . . . . . . . . $$ | . . . . . . . . . . . .[/go]
It turns out that the question was right all along - it was just that the "answer" turned out to be spectacularly more wrong than what I thought originally.
I recognize this problem. I remembered seeing it in the Lee Chang Ho Tesuji series. I went and looked through the books to find it and it's on page 237 of book 5. The images in your link are exactly the same as the book.
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Great post Illluck. A very unexpected plot twist.
I think examples like this show why we shouldn't be accepting of the answers provided in books. Not because they might be wrong, but because the fact that we tend not to notice when they are wrong shows how well we really understand them. It's not enough to just look at the answer and move on if it makes sense.
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