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Submitted by: Gath

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Hi. I can't resist being first.
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Is this another one of Fi's lovely photos.
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Good Maen to all! Nice picture. Where is Mount Olga located?
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Its more fun doing the hard and tough puzzles now since we continue to see such fine examples of photos taken from so many different parts of the world. Great work!
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I was going great guns till I reached 53 cells filled. Then I had to make 1 guess. Easy sailing thereafter.

What an unusual shape!
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Canuk Greg: Mt Olga is in the NW Territory, Australia, not far from Ayer's Rock (Uluru) and SW of Alice Springs. We were there in 2003. Facinating scenery. 4:46
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Is this in Australia. Looks very interesting.
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Oops, make that the Northern Territory, not NW. Apologies to Canada.
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Thanks HalT. I knew it was not in Canada, but I have yet to get to Australia, so the geography lesson is appreciated!
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P.S. - I am still a supporting member; just on a different PC at the moment.
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Hi HalT from SC! Nice to meet you! We visited Uluru & the Olgas in 2005. The changing color of those rocks depending on the time of day is unlike anything we have ever seen before. It was also SO dry there it was the first time I have ever missed the high humidity in Florida! Did you also go to Kings Canyon?
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Ack! where are you Steve?
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I am trying hard to understand the proofs given each day. Many thanks to you and all those others who post them. Can you please explain the logic behind step 19 of yesterday's proof:
19) AUR: (d4,d9,f4,f9)=67 => ~f9=67
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-still in shock after trying to prove this one
anyway, the 'forbidden rectangle' is based on the
assumption that a sudoku puzzle has a unique solution. If you place x,y in the corners of a
rectangle made of two boxes, two rows in those two
boxes (or two columns instead) then the x and More...
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Hi Kathy. Yes, we went on a 28 day tour of NZ and AU, including Kings Canyon. Absolutely fantastic trip. Can't think of any place we didn't enjoy.
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This proof is as bad as advertised:

1) Start 23, Unique Possibilities to (UP) 25.
2) Locked 9s at de9 forbid abgh9=9.
3) g79=25 == g7=9 -- i8=9 == i8=6 -- i5=6 == i5=8 -- g4=8 == g4=29 -- {g9=2, g7=9} == g79=5 forbids g3=5. UP 27.
4) Hidden pair 69 at bh1 forbids b1=2, h1=137. UP More...
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Great photo except that it is located in the SW Northern Territory - until the name flashed up I recognised it as Australian outback.
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Red rocks. Is the soil that colour as well?
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lovely photo Fi?
have a great day/night one and all
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Wow, Clark! What a complicated proof, but it works. I found this puzzle quite impossible and frustrating.
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to Clark
quite an ingenious observation at step 2, which I
had some difficulty understanding.
Looking at it from an ALS slant (correct me if I'm wrong) you have:
ALS A--rc--B-rc--C--rc--D where A,B,C,D are ALS's and rc is a restricted common candidate linking 2 ALS's (an ALS More...
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I didn't see it that way but you are right. The same reasoning can be used there to show g36=9 is false, and that would shorten the proof somewhat.
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Where can I find these proofs that Pat is talking about
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Proof for 08/13/06
1) Start at 23 filled - the given puzzle. UP to 25. (Unique Possibilities).
2) g479=triplet 259 == h4=8 -- i5=8 == i5=6 -- i8=6 == i8=9 -- g7=9 == g79=pair 25
forbids g3=5(depth 5 as strong sets are contents of cells g479 and i58) UP 27
3) Hidden pair 69 at bh1 More...
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If anyone dared to try, it appears a combination of some of Clark's steps and some of mine would make both proofs a bit better....
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Real tough but I solved it.
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Sept. 20, 2007.
21/Sep/07 12:18 AM
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05/Sep/10 9:32 PM
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14/Dec/19 3:37 PM
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