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Thread: Sudoku

  1. #17

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    Noooo! Please, please, pleeease don't say it's random!

    Jim:

    1 9 4 6 5 7 8 3 2
    3 5 6 8 4 2 7 1 9
    8 2 7 9 1 3 6 5 4
    5 8 2 3 9 1 4 6 7
    9 6 1 5 7 4 2 8 3
    7 4 3 2 8 6 1 9 5
    6 3 9 4 2 8 5 7 1
    2 7 8 1 3 5 9 4 6
    4 1 5 7 6 9 3 2 8

    I think that's right.

  2. #18
    Tropical Fish Enthusiast jimscott's Avatar
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    Amori, do you have a system other than picking a row (or column)with the most numbers in it and working off of that, with having to backtrack when it doesn't work?

  3. #19

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    You know what, Jim? I really don't know anymore. At first it was a matter of doing lines and boxes but now it's just automatic and I don't think about it (I go into a trance of some sort - last summer I completely lost track of time and solved about 50 hard and fiendish puzzles from dusk to dawn!).
    In the case of this puzzle it was mostly by lines, then completing them and the 3x3 boxes.
    Unless I'm really stuck I seek how many of the same number can interact and work from there.

    OK, that didn't make any sense!

  4. #20
    Tropical Fish Enthusiast jimscott's Avatar
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    Quote Originally Posted by [b
    Quote[/b] (shokuchuu @ Mar. 30 2006,11:54)]In the case of this puzzle it was mostly by lines, then completing them and the 3x3 boxes.
    Unless I'm really stuck I seek how many of the same number can interact and work from there.

    OK, that didn't make any sense!
    Now that needs some eluscidation!!

  5. #21
    Moderator Schmoderator Fluorescent fluorite, England PlantAKiss's Avatar
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    Its random.

    "Fox terriers are born with about four times as much original sin in them as other dogs." - Jerome K. Jerome

  6. #22
    wicked good plants! Presto's Avatar
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    Quote Originally Posted by [b
    Quote[/b] (jimscott @ Mar. 30 2006,9:06)]0 0 0 6 0 0 0 3 2
    0 5 6 8 0 0 7 0 0
    8 0 7 9 1 0 0 5 0
    0 0 2 3 0 0 0 6 7
    9 0 0 5 0 4 0 0 3
    7 4 0 0 0 6 1 0 0
    0 3 0 0 2 8 5 0 1
    0 0 8 0 0 5 9 4 0
    4 1 0 0 0 9 0 0 0
    for this one, the first thing that stands out at me is the three 3x3 boxes that are on the left. The top one has a 7 in the right column, the middle one has a 7 in the left column, and the bottom one has no 7 yet. Since we can see that the right and left columns already have 7s in them, we can conclude that the 7 for the bottom box must be in the middle. And, there is only one blank spot for the middle column, so that spot is a 7:

    0 0 0 6 0 0 0 3 2
    0 5 6 8 0 0 7 0 0
    8 0 7 9 1 0 0 5 0
    0 0 2 3 0 0 0 6 7
    9 0 0 5 0 4 0 0 3
    7 4 0 0 0 6 1 0 0
    0 3 0 0 2 8 5 0 1
    0 7 8 0 0 5 9 4 0
    4 1 0 0 0 9 0 0 0


    Same sort of thing for the 3x3 boxes on the right side of the puzzle. The top and middle ones have 3s, in the middle and right columns respectively. But the bottom one doesn't, and there's only one blank spot in the left column, which must be a 3.

    0 0 0 6 0 0 0 3 2
    0 5 6 8 0 0 7 0 0
    8 0 7 9 1 0 0 5 0
    0 0 2 3 0 0 0 6 7
    9 0 0 5 0 4 0 0 3
    7 4 0 0 0 6 1 0 0
    0 3 0 0 2 8 5 0 1
    0 7 8 0 0 5 9 4 0
    4 1 0 0 0 9 3 0 0


    Now, on the bottom 3 boxes, the left and the right both have 3s, on the top and bottom rows respectively. But the middle box doesn't. And, there are 2 blank spots in that middle row. But if you look at the columns that those blank spaces are in, you can see that one of them already has a 3. So, it must be the OTHER one.

    0 0 0 6 0 0 0 3 2
    0 5 6 8 0 0 7 0 0
    8 0 7 9 1 0 0 5 0
    0 0 2 3 0 0 0 6 7
    9 0 0 5 0 4 0 0 3
    7 4 0 0 0 6 1 0 0
    0 3 0 0 2 8 5 0 1
    0 7 8 0 3 5 9 4 0
    4 1 0 0 0 9 3 0 0


    So you want to keep jumping around the puzzle like that, using the information you already have to narrow down the possibilities.
    -Emily

  7. #23
    Tropical Fish Enthusiast jimscott's Avatar
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    Emily, I am truly impressed! Following that logic, I can see a 5 going in the top row, just to the right of the 6 and an 8 going to the left of the 3, on top of the 7, on that top row. A 4 would go in the seventh row, to the left ofc the 2. Does it sound like I have the hang of it?

    Suzanne, there really is a logical system of approaching it!

  8. #24
    wicked good plants! Presto's Avatar
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    you got it!
    -Emily

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