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champagne # 205 # (36210) #

 
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Pat



Joined: 23 Feb 2010
Posts: 165

PostPosted: Mon Apr 22, 2013 12:18 pm    Post subject: champagne # 205 # (36210) # Reply with quote

RobertRattley (2013.Apr.20) wrote:

    my solving techniques
    are steered by knowledge of the classification.

    • If a puzzle is "very hard",
      I assume I'll reach a point where a wing will be needed,

    • and conversely if it is "hard"
      I'll be confident that I won't reach such a point.


the following puzzle only needs "basic" moves

would you classify it "hard" ?

    1.......2.3.4..5....2....6..5.31.......7.8..4....95....7....4....6....8.9...2...6

    [ play ]

Code:


 1 . . | . . . | . . 2
 . 3 . | 4 . . | 5 . .
 . . 2 | . . . | . 6 .
-------+-------+------
 . 5 . | 3 1 . | . . .
 . . . | 7 . 8 | . . 4
 . . . | . 9 5 | . . .
-------+-------+------
 . 7 . | . . . | 4 . .
 . . 6 | . . . | . 8 .
 9 . . | . 2 . | . . 6

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arkietech



Joined: 31 Jul 2008
Posts: 1717
Location: Northwest Arkansas USA

PostPosted: Mon Apr 22, 2013 2:19 pm    Post subject: Reply with quote

I needed two triples to solve this puzzle. I would consider it Hard. Hard to me are puzzles requiring triples or quads but using only basic moves.
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Pat



Joined: 23 Feb 2010
Posts: 165

PostPosted: Mon Apr 22, 2013 2:58 pm    Post subject: Reply with quote


    using only "basic" moves, i needed a total of 8 moves

    this may explain the "VH" grade

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Pat



Joined: 23 Feb 2010
Posts: 165

PostPosted: Thu Apr 25, 2013 11:39 am    Post subject: Reply with quote


    this puzzle has an oddity
    2 solution-paths

      which would you prefer ?

    (see earlier discussion)
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arkietech



Joined: 31 Jul 2008
Posts: 1717
Location: Northwest Arkansas USA

PostPosted: Thu Apr 25, 2013 12:04 pm    Post subject: Reply with quote

An x-wing is often easier than a triple to spot and preferable. This does not change the rating of the puzzle. If it can be solved with locked sets and locked cells and contains a triple or quad it is classified as hard in my mind.

Sometimes I can spot an x-wing easier than a naked single. This doesn't make an "easy" puzzle "very hard" Very Happy
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