Encyclopedia of life and death-900 Elementary problems

[skydyr]

But I don't really think of these problems as tsumegoes in the usual sense. It's called the "Encyclopedia of life and death" for a reason, and is purpose is to drill you in recognizing common shapes and the methods they can be attacked or defended, rather than just exercises in reading.

That's the purpose behind all tsumego. You do a life or death problem to drill basic shapes and how to attack and defend them, because they come up all the time. There's no secret that separates the tsumego tsumego from other life and death problems.

[leichtloeslich]

Go players misunderstood the Carpenter's Square for centuries. They thought that the invader could kill.

I don't believe a word of it. Source?


edit:
As for carpenters square problems in this collection, they're all fairly easy. The hardest problem I remember from this one is.. erm, let me see if I can find it again.

edit2: there we go. T'was number 607:

$$ black to live
$$ +------------------------------
$$ | . X O . . . O . . . . . . . .
$$ | O X O . . X X O . . . . . . .
$$ | O X O X X O O O . . . . . . .
$$ | O X X X . O . , . . . . . . .
$$ | . O O O O . . . . . . . . . .
$$ | . . . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . . . .

Click Here To Show Diagram Code

[go]$$ black to live
$$ +------------------------------
$$ | . X O . . . O . . . . . . . .
$$ | O X O . . X X O . . . . . . .
$$ | O X O X X O O O . . . . . . .
$$ | O X X X . O . , . . . . . . .
$$ | . O O O O . . . . . . . . . .
$$ | . . . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . . . .[/go]

[xela]

Cute problem. I had to "Sherlock Holmes" the solution: there are only five moves worth trying at all, and four clearly don't work, so even though the other option initially looks as though it fails...

$$B
$$ +------------------------------
$$ | . X O . 4 1 O 3 . . . . . . .
$$ | O X O 5 2 X X O . . . . . . .
$$ | O X O X X O O O . . . . . . .
$$ | O X X X . O . , . . . . . . .
$$ | . O O O O . . . . . . . . . .
$$ | . . . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . . . .

Click Here To Show Diagram Code

[go]$$B
$$ +------------------------------
$$ | . X O . 4 1 O 3 . . . . . . .
$$ | O X O 5 2 X X O . . . . . . .
$$ | O X O X X O O O . . . . . . .
$$ | O X X X . O . , . . . . . . .
$$ | . O O O O . . . . . . . . . .
$$ | . . . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . . . .[/go]

$$Wm6
$$ +------------------------------
$$ | . X O 2 O X 1 X . . . . . . .
$$ | O X O X O X X O . . . . . . .
$$ | O X O X X O O O . . . . . . .
$$ | O X X X . O . , . . . . . . .
$$ | . O O O O . . . . . . . . . .
$$ | . . . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . . . .

Click Here To Show Diagram Code

[go]$$Wm6
$$ +------------------------------
$$ | . X O 2 O X 1 X . . . . . . .
$$ | O X O X O X X O . . . . . . .
$$ | O X O X X O O O . . . . . . .
$$ | O X X X . O . , . . . . . . .
$$ | . O O O O . . . . . . . . . .
$$ | . . . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . . . .[/go]

$$Wm8
$$ +------------------------------
$$ | . X . X O . O B . . . . . . .
$$ | O X 1 X O 2 . O . . . . . . .
$$ | O X . X X O O O . . . . . . .
$$ | O X X X . O . , . . . . . . .
$$ | . O O O O . . . . . . . . . .
$$ | . . . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . . . .

Click Here To Show Diagram Code

[go]$$Wm8
$$ +------------------------------
$$ | . X . X O . O B . . . . . . .
$$ | O X 1 X O 2 . O . . . . . . .
$$ | O X . X X O O O . . . . . . .
$$ | O X X X . O . , . . . . . . .
$$ | . O O O O . . . . . . . . . .
$$ | . . . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . . . .[/go]

The circled stone is in the right place to create a shortage of libeties.

[John Fairbairn]

Go players misunderstood the Carpenter's Square for centuries. They thought that the invader could kill.

But it's given as ko in Gateway to All Marvels and we don't know the history before then