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finish this (bleepin) sudoku... EDIT: finished by Mr. Sluggo, SJ's sudoku king

Discussion in 'Anything goes' started by Rusty Shackleford, May 6, 2008.

  1. Rusty Shackleford

    Rusty Shackleford Active Member

    I'm not normally a big sudoku fan. But for whatever reason, I've been working them fairly regularly here recently out of this book I got a long time ago as a stocking stuffer.

    Anyway, I'm convinced this particular Sudoku cannot be solved without simply guessing. You pick one of the squares where only two numbers could be (for example, the fifth row needs a 7 and 9), plug one of them in and work from there until you either finish or get stuck. And if you get stuck, you go back and plug in the other choice.

    I got so frustrated with the seeming lack of logic at this point behind this one that I got online and entered it into some programs that solve sudokus, but I couldn't find one that offered a good explanation of how it got to the answer it got, so for all I know those programs could just guess, too.

    So I leave it to SJ to solve it, and give me a logical reason as to how it was done. I'm sure somebody here is a sudoku master. Let's see the masters at work...

    020 007 009
    080 003 004
    160 084 000
    602 008 735
    008 532 641
    005 700 090
    806 000 907
    200 000 406
    000 070 020
     
  2. copperpot

    copperpot Well-Known Member

    Re: finish this (bleepin) sudoku

    well, looking at the line 008 532 641, the second column has to be a seven, because there's a seven in every other row where it could go. So that means the first one is a nine. So that makes the puzzle look like this:

    020 007 009
    080 003 004
    160 084 000
    602 008 735
    978 532 641
    005 700 090
    806 000 907
    000 070 020
     
  3. Rusty Shackleford

    Rusty Shackleford Active Member

    Re: finish this (bleepin) sudoku

    But who's to say it's not 798 532 641 instead of 978 532 641? There are no 7s in the first three columns to make that judgment. (And actually, looking at the answer in the back of the book, it is 798 532 641)
     
  4. copperpot

    copperpot Well-Known Member

    Re: finish this (bleepin) sudoku

    Yikes. What the hell was I thinking? Guess it's been too long since I tackled a sudoku. Sorry about that.
     
  5. spnited

    spnited Active Member

    Re: finish this (bleepin) sudoku

    Rusty, you only have 8 horizontal rows. Don't you need 9?
     
  6. Rusty Shackleford

    Rusty Shackleford Active Member

    Re: finish this (bleepin) sudoku

    Oops, good call.

    020 007 009
    080 003 004
    160 084 000
    602 008 735
    008 532 641
    005 700 090
    806 000 907
    200 000 406
    000 070 020
     
  7. Moderator1

    Moderator1 Moderator Staff Member

    Re: finish this (bleepin) sudoku

    At first glance, it is a serious bitch.
    If I get time later, I'll give it a try.
     
  8. GBNF

    GBNF Active Member

    Re: finish this (bleepin) sudoku

    You do not choose the Matrix. Thee Matrix chooses you.
     
  9. Moderator1

    Moderator1 Moderator Staff Member

    Re: finish this (bleepin) sudoku

    Thought I had it - I was on a roll. Then I ended up with two many 4s in the bottom left and couldn't work my way out of it in the time I allowed myself. Maybe after work I will take another crack - that one is as difficult as any I've seen lately.
     
  10. Rusty Shackleford

    Rusty Shackleford Active Member

    Re: finish this (bleepin) sudoku

    Glad I'm not the only one who thinks so.

    And I just double-checked to make sure I didn't screw it up while typing, and it's perfectly accurate. The answer so far fits with the final answer in the back of my book (I've given up trying to work it myself). I just can't figure out how to go any further.
     
  11. novelist_wannabe

    novelist_wannabe Well-Known Member

    Re: finish this (bleepin) sudoku

    Is that the original puzzle? Or is that what you've been able to do with it so far?
     
  12. Rusty Shackleford

    Rusty Shackleford Active Member

    Re: finish this (bleepin) sudoku

    That's what I've done with it so far, although like I said, everything is correct so far. (I've looked at the answer, because I've given up trying to solve it.)
     
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