stuck on hard level puzzle

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stuck on hard level puzzle

Postby bokodi » Sun Oct 28, 2018 6:05 pm

I've been looking at this one for hours. Please help me with the next step.
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Joined: 28 October 2018

Re: stuck on hard level puzzle

Postby SpAce » Mon Oct 29, 2018 5:03 pm

Looks like you've exhausted all basic techniques, so you need something more advanced next. One technique that will solve the bottleneck is called Empty Rectangle. You have a couple of different ways to use that here (but you only need one). The most obvious opportunities are in boxes 4 and 7, using digit 4. (Here you can also see the same patterns as Finned or Sashimi X-Wings, aka Grouped Skyscrapers, or more generally as short X-Chains.) Ask again, if you need more details.
-SpAce-: Show
Code: Select all
   *             |    |               |    |    *
        *        |=()=|    /  _  \    |=()=|               *
            *    |    |   |-=( )=-|   |    |      *
     *                     \  ¯  /                   *   

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