Senket — Puzzle of the week #3

 

Is Blue secure?

Is Blue secure?

Blue thinks he has secured 28 squares of territory because the post at A protects the corner. He’s mistaken — there’s just enough wiggle room for Red to set up shop. How can Red invade and make territory?

Edit: added grid numbers to the diagram — Thanks Herman for kicking my butt to do this!

Update: and once Red invades, what is Blue’s best response?

 

 

 

 

Can Red invade?

Can Red invade?

Bonus: a slightly more cramped variation. Can Red invade and survive here?

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5 thoughts on “Senket — Puzzle of the week #3

  1. Herman Hiddema

    Ok, this one seems easier than the last one:

    Red starts at 3-1 with an immediate threat to take one point in the corner. Blue can stop this by playing 2-1, taking a point in the corner himself. Red then moved to the right, connceting to 5-2, which threatens to take territory at 7-1. Blue can only prevent that by playing 7-1 himself. Red then move to the right again, to 7-3, after which 6-1 and 8-1 are miai for taking territory.

    BTW: Maybe it is a good idea to add a coordinate system? All this line counting I’m doing is a little tedious 🙂

    Reply
    1. gcanyon Post author

      I’d been meaning to add coordinates for some time, but I was wrapped up in getting scoring to work. After your message I went ahead and did it. I also added a (perhaps harder) more interesting position.

      Reply
  2. Herman Hiddema

    I’m getting better at this 🙂

    For the new problem:

    Red starts at 3-1 (threatens to take the corner with 1-2)
    Blue prevents by taking the corner himself with 2-1.
    Red plays 4-3 (threatens to take edge territory with 5-1)
    Blue prevents this by playing 5-1 himself (only way)
    Red plays 6-2 (threatens to take edge territory with 4-1)
    Blue prevents this by playing 4-1 himself (only way again)
    Red plays 8-3
    Now the moves 7-1 (for edge territory), and 6-4 (for center territory) are open, and blue cannot prevent both.

    Reply
  3. Pingback: Senket — Puzzle of the Week #3 Solution « Geoff Canyon’s Appeal to Authority

  4. Pingback: Senket — Puzzle of the Week #3 Bonus Solution « Geoff Canyon’s Appeal to Authority

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