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Submitted by: Gath

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Missed the sweep
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eh?
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Maen to all. Beautiful rose to brighten up the day.
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17.56 yes, finished a tough one! It's been a while
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Thought it would be hard with no nine, but found it straightforward. I'm starting to dream in sudoku.
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17:12 - had me stumped for a few minutes but then it all came together.
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G'Maen to all Did this in 5:00 min but with guesses Off to work now on a beautiful Spring morning
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Good Maen all. 8:30 with no guesses. Lovely flower. Expecting snow here in the fair state of Utah. Hooray
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1) start at 23. Unique possiblities to 28.
2) Note: c1=9 == c1=1 -- c2=1 == c2=69 establishes c5=6 -- c36=9.
a1=9 == a1=1 -- ef1=1 == d2=1 -- d5=1 == f5=1 -- f5=6 == c5=6 forbids c36=9
Depth is either 5 or 6, pending double counting of c1=9 == c1=1?
3) UP to 35: Locked 4's forbid More...
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OOOPS!
Sets 5 or 6 at step 2 (+ 5) at step 3 = 10 or 11. Sorry!
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TYPOS!!
1) start at 23. Unique possiblities to 28.
2) Note: c1=9 == c1=1 -- c2=1 == c2=69 establishes c5=6 -- c36=9.
c1=9 == c1=1 -- ef1=1 == d2=1 -- d5=1 == f5=1 -- f5=6 == c5=6 forbids c36=9
Depth is either 5 or 6, pending double counting of c1=9 == c1=1?
3) UP to 35: Locked 4's More...
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I am a bone head!
1) start at 23. Unique possiblities to 28.
2) Note: c1=9 == c1=1 -- c2=1 == c2=69 establishes c5=6 -- c36=9.
c1=9 == c1=1 -- ef1=1 == d2=1 -- d5=1 == f5=1 -- f5=6 == c5=6 forbids c356=9
3) UP 81
Depth 5 o6 6, sets 5 or 6.
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How pretty - very pretty. A single pail pink rose on a bed of water.
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Beautiful rose for a cloudy day. Hopefully it will rain here.
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Sorry about first proof. Only read second one. Just one fc gets three eliminations which solve the puzzle.
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12:17 - best for tough yet. Did not seem difficult, though.
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alternative solution:
1) start 23. Up to 28.
2) Locked 1's forbid a12=1.
c2=1 == d2=1 -- d5=1 == f5=1 -- f5=6 == c5=6 forbids c2=6.
Pair 19 at c12 forbids 9 at c356.
3) UP to 81
depth 3, sets 6.
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Very nice, Steve. Here's another appproach. I'll let you total the score.
1. Unique possibilities to 27.
2. Naked triplet 249 in Be2 => eliminations and i3=6. 28
3. fc: (d2=7)==(a2=7)--(a2=6)==(a4=6)--(c5=6)==
(f5=6)--(f5=1)==(d5=1) => d2<>1 => d2=7. Fill to 81.
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One step before the fill to 81: locked 18 pairs in R1 => c1=9.
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Hi DJ!
Very nice proof. BTW, you do not need the pair 18. I tried your proof and it works without it.
It looks like depth 4, sets 7. Definately better that my first proofs... About equal to the last one I submitted. I tend to get hung up on techniques I consider 'interesting' rather than do the efficient one first.
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21:03 - least guesses for ages. Felt good.

Getting late now, G'meaNy to all.
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I think I like your proof better, DJ. Your proof solves a cell with one step, then solves the puzzle with a fc. Versus my last proof, which solves nothing with the first two fc's before solving the puzzle with the third fc.
Thus, your proof is more natural, mine seems less so.
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Both proofs are a huge improvement over doing all the 'easy' eliminations, still to get stuck at 29 filled needing an fc. At least, that is the way I see it.
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10'45, one very lucky guess. G'Maen, all.
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I agree, Steve. My first time through, I did a lot of locked-set eliminations which didn't help at all in the final analysis. But I missed your fc.
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Could someone direct me to a loction where I can translate some of the posted proofs (like Steve's of DJ's). I simply need a translation of, for example, 'd2=7==a2=7--a2=6==a2=4--...'. Is this saying 'if d2 is 7 then a2 isn't 7 and thus a2 is 6 and so a2 isn't 4' and so on?
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That should say '...like Steve's OR DJ's...'.
(I hate typos!)
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Hi Sean - click on 'proofs' at the bottom of the page. GB has a website where the terminology is explained.
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Well, we can all give up now. Scientists have developed a biological imaging algorithm that solves ALL Sudoku puzzles. Here is the article...
http://www.news.cornell.edu/ stories/Feb06/Elser.sudoku.lg.html
Of course it wouldn't be so much fun then!
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Great puzzle today, managed to finish it before breakfast. After 36 filled forbid 9 at h5, then forbid 7 at f1.
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20:21 Hi to all
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Because it is raining today, and I have little else that needs to be done, I muse which of the following identical 5 sets, depth 5 solutions is easier to read. Both at 28 filled after Unique Placements only.
A) c2=69 == c2=1--c1=1 ==c1=9 == c1=1 -- ef1=1 == d2=1 -- d5=1 == f5=1 -- f5=6 == More...
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Pretty easy actually - nice Rose
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5.33, with no guesses.
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I've read the links and pages on proofs, but don't recall seeing Nishio. Can someone enlighten, please? Thanks!
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20.24 with one huess...think i'm getting better but its difficult
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15:27 with a guess! Good mAen all!
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