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Tough Sudoku for 10/July/2006

                 
                 
                 
                 
                 
                 
                 
                 
                 

Choose a number, and place it in the grid above.

  1 2 3 4 5 6 7 8 9
Check out the latest post in the Sudoku Forum

Sudoku Solving Techniques

Submitted by: sudoku lover

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Hi Everyone,

I've been busy, and added a 'Blank Grids' page. You get 4 grids per page, so you can print them out & play newspaper puzzles (or puzzles from here) anytime you want.

You can find the link in the main menu up the top, or here:
http://www.sudoku.com.au/blankgrids.aspx

I've also added a save/load game facility to the crossword site.


Gath
Good Maen to all! Interesting sculpture. Is the last desire simply a peaceful/blissful rest?
6:25
13:41 with considered guesses, slow, but it's late. Snoozey time methinks.
In fact, not unlike the sculpture snoozing in the warm sun - sounds blissful!
Deb, what a beautiful son you have.
I have 2 kids 3 & 1, rest is not my last desire, more like 1st or 2nd.

Good mAen, all!
You can see my 1 year old on the 6x6 hard.
Easy tough or hard, it's the first one I've managed to solve without help. I'm pretty chuffed and just letting you know. Cheers all
:-( Took me ages and I had to guess, which can't be right. It was all down to that little clump of 3s 7s & 8s in the bottom right box-of-nine - I'd worked out, from the completed column in that box, which columns the 7s & 9s must be in in the right hand set of nines, and the same for the 2s over More...
First time to post--Gath you have an incredible site here! I'm recovering from open-heart surgery and working the sudoku's and reading the comments are a must for me daily. What an interesting and compassionate group of people from all over the world!! I look forward to visiting here daily; I love the jokes and recipes and general comments. Thank you for the site and comments. Good maEn all.
to Steve in Ohio -
I'm just starting out trying forbidding chains - going through the
archives of toughs. Here's my proof of Jan 4, 2006. (I've altered
the notation slightly to make it less confusing - at least for me)
x.n :: cell x takes the value n
~x.nm :: More...
I agree, that is an interesting sculpture. Very content looking.

Welcome, Cyndi From SC/usa!
missielely From Kansas, Your little girl is adorable!
A rather messy proof:

1) Start 23, Unique Possibilities to (UP) 26.
2) Naked pair 79 at fh3 forbids a3=79, e3=9.
3) Hidden pair 18 at e1, f2 forbids e1=29, f2=79.
4) Locked 9s at e79 forbid d78=9, f89=9. UP 44.
5) The forcing matrix:
i9=6
i6=6 h6=6
0000 h6=5 More...
Congratulations!
sleeping buddah?
beautiful picture
Hi Missielely, your daughter is beautiful! I wish I had two though I adore my four year old daughter!
5.13 Great pic
9:43 Maen
To denis from auckland.

The tough puzzle from 8 July is a good place to try the double-chain method. Starting from 23 filled, fill in the easy moves, viz:

1) Look at the 1s. a4=1, f2=1, d9=1, i7=1.
2) In block b2, c3=7.

3) Now for the double chain. Where to start is More...
23.15
Same pic as tomorrow
Late also on this one....
An alternative proof:

1) Start at 23 filled - the given puzzle. Unique Possibilities to 26 filled. (UP 26).
2a) Hidden pair 18 at e1f2 forbids e1=29 and f2=79
2b) Pair 79 at fh3 forbids a3=7 and ae3=9.
2c) Locked 9's at e79 forbids d78,f89=9 UP More...
35:35
Aug. 23, 2007.
23/Aug/07 9:28 PM

SE=7.2
05/Sep/10 9:11 PM
24:32.
05/Nov/19 11:15 PM
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