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Submitted by: uno hu

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10:03 Maen What's up, Penny Pup?
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well dog gone, a shiney new penny
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8:50 Maen
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22:09
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Hi!
I have decided to post another blog page.
This one is a continuation of some of the ideas presented yesterday, and is a proof of today's tough puzzle.
To find the blog, look in the upper right column under 'Check out the sudoku blog'.
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Wishing everyone a wonderful weekend ...
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Looks like a happy dog!
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Cute little dog. I wish mine would stay that still. Have a good weekend.
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12:46; good to see green grass. All our blades are frosted stiff!
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Blades of grass? I've forgotten what grass looks like.
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I just want to thank Steve for posting the proofs with pictures. I think I'm finally starting to get it. It certainly helps having the pictures.
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You are most welcome, Joe!

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I'm starting to understand and be able to use some of the blogs. Thanks Steve. The lingo takes a bit of getting used to. Its like learning another language.
My grass is sunburned and water starved so is not green either. Lucky Penny.
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anybody feel like posting the solution for 1/19
(yesterday) ?
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Vance, I don't know how to 'post' the solution, but if you go to archive, then to yesterday's date, then to the level for which you want, then click on 'show solution' the solution will come up. Hope this helps!
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thanks barb, i wanted the steps in solving so i am not guessing.

ps where are you from?
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Sorry Vance - I didn't understand what you were looking for!
I'm from Annapolis MD - the Sailing Capital of the World!
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Looks to me that she is a working girl so has to earn her pennies. Steve thanks for the pic on the blog I couldn't work out what you were talking about before now starting to make sense.
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Good challenge. Needed some coloring to eliminate all those conjugate sixes but my skills are improving. Fine looking Dog.
Thanks as always.
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I agree with Joe-thanx Steve
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10:52 My grass just 6' of white stuff on it
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grass - that brown brittle stuff barely distinguishable from the dirt
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Hi Vance!
I posted a complete proof to yesterday's puzzle in the blog. It is the page:'Advanced Forbidding chains'.
You can access it by entering the blog through the link in the upper right column, then under previous entries clicking on the link 'Advanced forbidding chains', or using this link:
sudoku.com.au/fc201.aspx
You may have to eliminate spaces if pasting the link.
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18:00 A new world and Olympic record for me, for a tough. :)
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much appreciated steve.
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Maen! 35 minutes. Finally saw it! After the 'initial' UPs d2 cannot be a 6 for then f3 cannot be anything! (d1=3 and then you can fill up the center region etc.)
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Alternative proof suggested by jyrki from Finland:
1) Start at 22 filled - the given puzzle. Unique Possibilities to 27 filled. (UP 27).
2a){pair 49 at f79} == f7=6 -- d7=6 == d6=6 -- g6=6 == g1=6 -- g1=9 == d1=9 forbids f3=9
2b){pair 49 at f79} == f7=6 -- d7=6 == d6=6 -- g6=6 == g1=6 -- More...
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hmmm forgot the pair 57,
14 sets, rating: .98
Also, I suppose it is 28% better than mine...
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Maen Penny. Good to see you again.
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Penny Pup, it too me a long time to find you. Tough puzzle. Picture worth the labour.
16/Jun/07 7:52 AM
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Dec. 27, 2007.
28/Dec/07 1:56 AM
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SE=7.3
05/Sep/10 11:26 PM
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second path can be combined into one chain:

(9=356)cde1-(168')d257=(6)d1-g1=g6-c6=c7-(6=49)f79 => f3<>9, d7<>4 STE.
25/Dec/10 1:11 AM
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