Weekly Go problems: Week 21

Here are the weekly Go problems for week 21.

Black plays first in all problems and all solutions are labeled ‘correct’. Have fun!

Easy Go problem

A ko would be a failure here…

ggg easy 21 picture

Download the solutions to the easy problem as an SGF or PDF file.

 

Intermediate Go problem

It’s a capturing race with four liberties each. You should be able to win if you play first, but how do you stop white from getting more liberties?

ggg intermediate 21 picture

Download the solutions to the intermediate problem as an SGF or PDF file.

 

Hard Go problem

Maybe you think this is the same as the last problem? Perhaps so, but be careful…

go problems 21 picture

Download the solutions to the hard problem as an SGF or PDF file.

 

Still want more Go problems?

You can find Go books packed full of life and death problems, tesuji problems and other valuable Go knowledge at the Go Game Shop.

Discuss other possible moves

If you have any questions or want to discuss any of these problems, please leave a comment below at any time. You can use the coordinates on the problem images to discuss a move or sequence of moves.

You can also download the solutions as a PDF or SGF file by clicking the links below each problem.

About David Ormerod

David likes teaching, learning, playing and writing about the game Go. He's taught hundreds of people to play Go, including many children at schools in Australia. In 2010 David was the Australian representative at the 31st World Amateur Go Championships. He's a 5 dan amateur Go player and is the editor of Go Game Guru. You can find David on Google+ and follow Go Game Guru on Facebook, Google+ or Twitter.

Comments

  1. Got the first two, but the hard puzzles me. Also, there’s so much aji on the right side…

    Ruben

  2. The hard problem is a nice one,and is very misleading.That’s a good example of why you need to read everything till the end enven though the shape looks familiar.Anyway,thanks for the great stuff!

  3. Nguyen Le Anh Duc says:

    hard: B2 C3 B3 C4 B4 C5 C6 B5 B1 :D

    • Please delete this comment ASAP! Please don’t deprive others’ right to have fun figuring it out themselves

      • Don’t delete it. I spent over half an hour on this problem and still couldn’t get the answer. If people don’t want it, they won’t read the comments.

        • Oliver Charles says:

          People can find the answer by downloading the sgf and viewing it themselves. I agree, don’t spoil it in the comments :)

          • David Ormerod says:

            I don’t really mind people posting their variations here so that we can discuss them. A sequence of moves written like that is not really that easy to follow anyway, so I think it still takes a bit of effort to ‘read’ them and ruin the problem. :)

            That being said, it doesn’t really add much to just post the solution without saying anything else. In this case, maybe Nguyen doesn’t speak English that well and this is just his or her way of saying thanks.

    • I was able to figure out this pathway in about 5 minutes. And I can see that reduce the liberty count to 3 for the white group. However, I don’t see what move sequence is next. I’ve tried every variation I know of and still cannot figure out to make the move after white’s B1.

      Black’s A5 is followed by white’s throw in at A4. Black’s A3 captures, but white responds with another throw in at A2, which black captures at A1 forcing a ko fight.

      So, is the answer to generate a ko fight with white to have to find first ko threat? If so, the problem description is a bit too oblique. And secondly, the problem play-out app says “End of variation” but does not indicate “correct”.

      Or did I miss a variation that does end in correct? If so, I would love to understand how it works.

      • Oops…I got the very last move wrong. In response to white’s B5, black’s B1 (not B6). Very devious. I totally see the continuation now, LOL!

        BTW, I downloaded the .sgf and viewed it in Jago. I love it.

        • David Ormerod says:

          Right Jim, it’s very tricky at the end there. That’s what I meant by ‘be careful’ :) . I’m glad you figured it out.

  4. The second one was a known tesuji. But the third… I solved after a lot of tries. I can’t read this in a real game.

    Thanks a lot.

    • David Ormerod says:

      Yes, they look the same, but as you found they’re not :) . If you remember the basic ideas in the hard problem, you might get a chance to play some moves like this in a real game someday…

  5. LucNoSensei says:

    I actually found the third pretty easy (although extremely cool). The important setup stones sort of pop when you do similar problems :)

  6. Intermediate: known tesuji for me (one of the few things Sensei’s helped me to interiorize)

    Hard: I must admit I embarked on a try and almost instinctively made the correct move. One starts to have a feel for this liberty increasing tesuji after all those years.

  7. Both the intermediate and hard problems are very cool! I knew the first move by instinct but as usual, was not able to read through the whole thing.

  8. I can’t believe I’m having more difficulty doing the intermediate than the hard one!

  9. This time I found all problems very easy, unlike usually.

  10. The hard one is too hard!!!1

  11. Can’t figure out intermediate!

    Tried C3, C4, D1… and it doesn’t work…

    Can someone help me out? I just can’t figure it out…

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