Weekly Go problems: Week 35

Here are the weekly Go problems for week 35.

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

Easy Go problem

You can probably see how you’re going to make an eye already, but think about your move order too.

ggg easy 35 picture

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

 

Intermediate Go problem

In a symmetrical situation, play on the point of symmetry…

ggg intermediate 35 picture

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

 

Hard Go problem

There are only a few choices and it looks obvious, but be wary of shooting from the hip.

go problems 35 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. This time, I loved the easy problem. The Intermediate problem is quite a lesson. The third was an easy one but I’ve found my self wondering if ko is always better than seki.

    • David Ormerod says:

      This situation is fairly one sided and white won’t get many points even if she wins the ko. In addition, making seki is gote in this case, so in nearly all cases it will be better to wait to start a ko (at the right time) and use it to gain something elsewhere on the board.

      As you said, it’s not always the case that ko is better though. Even with this problem, if it was late in the endgame and you didn’t have enough ko threats to win, making the seki could be the better option.

      One other small point here is that some variations expose a cutting point at D4 and you may not want to make a gote seki if that’s going to be a problem. The correct solution gets two useful moves in place on the outside, regardless of what happens next.

  2. There seems to be an inaccuracy in problem 2:

    G2-F2
    E2-F1
    F3 – end of variation

    However, Black lives here, since E1 and G1 are miai. I haven’t figured out White’s alternatives, but this variation is incomplete.

    I found this one much harder than the hard one, where I recognized the shape from typical endgame damezumari.

  3. David, we cannot thank you enough for your helping us out with your insight, games, and problems.

    BTW, the intermediate problem appears to have a hastily listed (incorrect) refutation of Black’s G2 defense, viz.,
    G2 F2(incorrect) E2 F1 G1 F3.

    Black can live with:
    G2 F2(incorrect) E2 F1 F3 D1 G1.

    Instead, one way that White can kill is:
    G2 E3 E2 F3 G3 D1 E1 H1 G1 F2.

    Or as usual, maybe I’m missing something trivial.

  4. Dieter, what about G2-E2
    E3-F2
    D1-F3
    Then I see a seki after F1.

  5. David Ormerod says:

    Ahh, that’s embarrassing, thanks for pointing it out guys. I’ve fixed that branch in the solution files.

    I was too busy working on Baduk TV last night and didn’t double check anything :(. Looking at it now that I’m completely awake, I’m not sure what I was thinking…

    Dieter, you may be right that the intermediate one is harder as it stands. Originally I’d planned to show the problem position 2 moves into the solution variation, but I thought it might be too easy then. As I was putting the variations in I started to regret the decision not to do that, because it became more complicated than I’d planned.

  6. Astros says:

    It seems at the end of the hard problem where it says correct that white has to play or lose the corner, however if white does play they can keep it easily enough… I’m not sure why this is a solution.
    I’m fairly new to the game but am curious.

    • David Ormerod says:

      Good question Astros, it’s what’s called a ‘ko’. The end result is that white’s not completely captured, but she’s not completely alive either

      At the end of the problem, white can capture a stone by playing A1, but think about what would happen if black then captures A1 by playing B2.

      Here’s some further reading if you’re interested:
      http://senseis.xmp.net/?ko

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