19 votes
Accepted

Why is this tsumego solution wrong?

In tsumegos where you should kill a group, the best (and thus correct) answer is always the solution where you kill unconditionally (if possible). Only if there is no unconditional kill the ko would ...
havogt's user avatar
  • 416
7 votes
Accepted

Building a live group on a quarter board where two sides are already black

This has been discussed a lot in Sensei's Library (http://senseis.xmp.net/?BiggestCorner and http://senseis.xmp.net/?10x10CornerGame1). The consensus seems to be that white dies with 8 free spaces, ...
jussius's user avatar
  • 188
6 votes

How to attack White’s corner in this beginner’s 9x9 game?

TimK's answer is right on point on how to kill white in the corner, but your question belies a more general concern: Thinking "I need to kill all the things" is a very common beginner's mistake. Take ...
goldPseudo's user avatar
  • 6,682
4 votes

How does black kill white in this Tsumego?

Seems Black has to take the 1-2 vital point to avoid White making 2 eyes. If White begin to deprive Black's liberty from outside, then Black get connected by taking on 1-3 and White deprives outside ...
Conifers's user avatar
  • 193
4 votes
Accepted

How does white win this capturing race?

This seems like a mistake to me. I don't see a way to win the race. I wonder if the point was that White now has a stable group, so this is a failure for black. White can hane underneath the stone on ...
TimK's user avatar
  • 3,478
3 votes
Accepted

How to attack White’s corner in this beginner’s 9x9 game?

This is a really broad question, and it depends on your level. The general idea is to reduce the opponent's eye space. D8-C8-B6 would probably be a good way to start: $$Bc $$ --------------------- $$...
TimK's user avatar
  • 3,478
2 votes
Accepted

How does White survive in this corner?

To answer the original question: White's corner is unconditionally dead, it cannot be rescued even with White playing first. The points P1 and R1 are miai, when White takes one of them Black takes the ...
Sir Cornflakes's user avatar
2 votes

Building a live group on a quarter board where two sides are already black

I'm not familiar with this as folklore, but the setup is similar to the setup a person might use to work on corner problems. I believe that this could be answered by looking a many examples of corner ...
BBS's user avatar
  • 231
2 votes

Why is this tsumego solution wrong?

The Black move 1 reduces the "three in a row" from two eyes to one. White cannot protect his "second" eye at 3 until he kills the marked stone (in red) with 2, because it would be self atari. Black ...
Tom Au's user avatar
  • 22k

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