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16 x 16 broken?

Submitted by: barclay

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 Good Maen |  |
 Is this photo from GannieMo who has been to Prevelly recently. Beautiful sunset. |  |
 mmmm Hello Greg - how did you know I would be on here? How are you. |  |
 I was just quickly checking the site before I went to bed. I'm not used to looking after 9yo girls and I feel worn out. I think I'm getting old!!! |  |
 A proof for tough? sudoku of 01 10 2007: 1) Start at 23 filled - the given puzzle. Unique Possibilities to 28 filled. (UP 28).2)Y wing style: b6=5 == b6=8 -- i6=8 == i4=8 -- i4=7 == a4=7 forbids a4=5 UP 81Sets:3 Max depth 3. Rating .07 |  |
 As luck would have it, the current topic of the blog is all that is needed to unlock today's tough! |  |
 4:41 very easy Maen Where's Dan...I never see him on the tough one :poke: |  |
 Yes it is mine taken from my son's house there. Well done Anne |  |
 I'd be interested in the 5 UP off the start, I only get 3 and don't see the Y wing logic without more eliminations (presumably by the other 2 UP). I only see UP at a8,f5,g6 |  |
 Maen. Another little stinker. I don't know how to determine without trying which configuration of sevens is correct - fortunately there were only two. Steve? |  |
 Not so tough for a tough. Pretty picture GannieMo |  |
 Oh shame! Forgot to reset the timer. Found that on a litle tricky. Waaay past my bed time - got to go NIght! |  |
 mAen! Even I could do this, so not too difficult.27 minutes. To CS: look at 1s in the top left region and then column h ! I did get 6 easy cells initially (UP29!) as the 8 of the middle right region must be on column i, so we can deduce that h2=8. At that point if h5=5, More... |  |
 Have a wonderful day/night, all. |  |
 Oops! I left out two of the consequences of the assumption h5=5, namely i4=7, i6=8. Only with these extras will we arrive at a contradiction as in my previous post, and may conclude that h5=7. |  |
 These toughs are a LOT easier if you set up the possibilities right! Grrr. Gorgeous photo though. |  |
 Good afternoon to all! What a beautiful picture Mo! Thank you for sharing this experience! |  |
 20:47 |  |
 A no-guess tough is a cloud with a silver lining! |  |
 I came up with 5 unique as well....two 1s, one 3, one 4 and one 8 |  |
 wow..neat..the puzzle and the pic,both...:)... yesterday i didnt finish and been feeling a bit restless...today done for it..feels good..cheers |  |
 Great photo GrannieMo will love todays sunset after a scorching day. On the plus side going to a friends place to do pool exercises as its too hot for walking.Bye all. |  |
 There are three unique 1's not two. Check out the last three columns carefully. |  |
 Awesome picture! |  |
 12:45 was pretty tough. But my guesses must have been right. Have a good day everyone. |  |
 Thanks, MARTHA ... that helped! (The only ''middle'' one!) |  |
 I had a lucky guess - it only took me 6:22. Hey CS, from CT -- do you mind sharing where in CT? You seem to have a handle on these tough ones, I do alright, but I really don't understand the lingo for the proofs. Oh, and a lovely sunset! |  |
 Easy for a tough today, under 4 minutes after setup! Nice picture though! |  |
 Some have asked for details of the Unique possibilities. Here is what I did:f5 = 1% Box & Column.g6 = 3% Box & Column.a8 = 4% Box & Row.a9 = 1% Box & Column.h4 = 1% Column.This gets me to UP 28.IF one wishes to, one can, as Jyrki pointed out, use the locked 8's at i46 More... |  |
 The situation that I used to unlock today's puzzle is not a Y wing, but a Y wing style elimination. Y wing styles is the current blog topic, and eliminations of this type are discussed there. There are, of course, many other ways to tackle today's puzzle. Jyrki's explanation is depth 4, More... |  |
 Awesome picture! Needed one guess, but then the whole thing unravelled neatly. |  |
 Nice, interestimg. 12/Jun/07 8:51 AM |  |
 Dec. 21, 2007. 22/Dec/07 9:33 AM |  |
 SE=7.1 05/Sep/10 11:23 PM |  |

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