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16 x 16 broken?

Submitted by: barclay

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What a great picture!
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Cute chubby little feet.
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Ditto! Cute.
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Hi everyone and nice mAen to all.
Second picture today I missunderstand today ,maybe I have somthing wrong ,or my mind is not clear ,Will wait to read friends comments.
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That looks like a lot more fun than solving today's brutal puzzle.
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Good morning to all! The same art form as finger painting, but much more fun by the looks of it!
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OOOOOOOOOOH! Looks like that would be fun!
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Cute shot, JEANNEA!
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1) Start 22, Unique Possibilities to (UP) 26.
2) de4=4 == e5=4 -- e5=9 == e6=9 -- g6=9 == g6=8 -- c6=8 == c4=8 forbids c4=4.
3) ac5=7 == e5=7 -- e5=9 == e6=9 -- g6=9 == g6=8 -- c6=8 == c4=8 forbids c4=7.
4) Naked pair 18 at c46 forbids abc5=1, a6=1, c12=18, c9=1. UP 26.
5) Naked pair 45 at b57 forbids b2=45, b3=5, b8=4. UP 81.
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Clark, thank goodness you have an answer. Steve has abandoned us for some sort of work priority. HHmmm!

Thank both of you for the answers anytime. It really helps.
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I am sure it is FUN! Have to try....
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Very nice proof Clark. You tamed the beast, and very concisely!
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I concur with Dave!

Very nice proof Clark!

BTW, the parameters that I have suggested for locating forbidding chains should flag cell e5 as a likely focal point for some fruitful chains. Happily, Clark found two that run through that cell.
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I didn't take the shot... my daughter did of my granddaughter. But thanks for all the nice comments. Toe painting... instead of, or along with finger painting is a great activity on a Summer day...OUTSIDE!!
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Looks like she missed a couple of toenails, but I think that was of no consequence whatsoever. This is an awesome picture.
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It looks more like foot painting LOL makes a nice change. that puzzle gave me a headache.
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Clark - what do you mean - start 22? I'm confused..
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to Clark:
1) Start 22, Unique Possibilities to (UP) 26.
2) c6=1==c6=8 and see what happens. Forbids ab5=6 and abc5=1
3) Easy techniques from then on. 81 filled.
(solution found by scanraid)
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A sweet hello to everyone. That said, this frikken puzzle drove me nuts. Forget naked/pointing pairs. Not even quads! Quints? Sexes(hehe). Barely enough bivalue pairs for custey eliminations. Congrats to all you right-braniacs who forbade their way to finding this puzzle even remotely enjoyable.
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Maybe I'm just in a hostile mood having taken a full day to solve this but nyteraider, 'see what happens' and what scanraid had to say has no value here. I'm sure SudoCue (the prog I use) would have spotted all sorts of Almost Locked Sets, Nishios, Medusa color wraps, traps and bridges and table More...
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I was able to write a proof from nyteraider's comment. It's a little shorter than the one I originally wrote, but the key chain is almost impossible to find unless you know it's there in advance:

1) Start 22, Unique Possibilities to (UP) 26.
2) {hi5=16} == i4=16 -- {gi4=38} == g6=8 -- More...
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To Clark
In my view, if you start the chain with c6 it looks less complicated to me:
c6= 1 or 8
c6=1==a6=6, this forbids ab5=6 and abc5=1
c6=8==g6=9==g5=2==hi5=16, this also forbids ab5=6 and abc5=1
Can't this be written in the usual style?
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can you do a blog on solution to 28th January 2007 tough sudoku??
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Sorry to post this second post. I am foxed with 28th Jan - 07 tough puzzle while I could figure out the diabolical one of 6th Feb-07 with the excellent help of the blog pages on forbidden chains. If it is not too much trouble may I request a blog on the solution for this one pleaase.
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jeln wsnrq zfkrqcbu aztipduxk pqiojdrb rxjb kelcg
07/Jun/07 12:29 AM
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ijksctl kwqeufat urnhzpvi sivjet xdlsqahwc zilhf ishpmfqr http://www.tbnfgzyj.zkmtcru.com
07/Jun/07 12:30 AM
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19/Jun/07 8:48 AM
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Dec. 29, 2007.
30/Dec/07 6:06 AM
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05/Sep/10 11:29 PM
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1.SST to UP=26
2.(168=9)acg6-(9=126)ghi5 => abc5<>16 STE.
25/Dec/10 2:38 AM
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