Sudoku Puzzles

Maen!
The Sudoku blog that Gath has generously allowed me to author on this site has a new page, Forbidding Chains 101 The Theory.
You can access this page through the link in the upper right column of this page.
Please feel free to visit, or even comment.

Thanks Steve, but I can't find the link to that blog. Under 'Sudoku solving techniques' or one of the categories, such as 'Guestbook'? Am keen to see the forbidding chains info.

11:18 Maen

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.

Have a great day/night, everyone!

If you are having trouble finding the link, look:

In the right column, immediately above where it says: Easy, Medium, Hard, Tough

It should say (every day) Check out the Sudoku blog. Under that there should be a link to the most recent page.

If you have not visited the blog More...

Kathy - the proof lingo is explained within the blog as well. I once did not understand any of the lingo either....

A proof for tough!! sudoku of 01 11 2007:

1) Start at 23 filled - the given puzzle. Unique Possibilities to 27 filled. (UP 27).
2a) Locked 7's at i56 forbids g5h6=7
2b) d2==8 == d7=8 -- e7=8 == e7=1 -- df8=1 == g8=1 -- g8=7 == g2=7 forbids g2=8 UP 37
3a) Locked 5's at b23 forbids More...

8:17
This horse is beautiful.... I love horses

Kathy, hope you don't mind me jumping in here, but we sent 3 yrs in Windsor Locks (after a couple of months in Farmington). Are you there permanently? I liked New England, but couldn't take the snow/ice/sleet.

10:23; wud love to get a glossary on the proof lingo, on to the blog.

34:17

finished w/o difficulty..a horse peeping out longingly,at what i wonder...the shining sun retired a bit early and i could see the white frost already start settling on the black slope of the roof...turned up the temp of the room heater...just another three nights to go..
then back to sunny sweet Chennai...
cheers

That's an, um, interesting barn?

I understand the terms with the proofs, it's the cell references I don't get. Unique possibilities to 27 filled. Unique possibilities obvious ... 27? Locked 7s at i56 - locked 7s obvious, i56?!

Keyan
Nice composition...horse knew just the angle of pose!

Hi Kate!
The opening page of my blog describes the cell references:
bottom left corner is a1, top right corner is i9,
rows are 1 thru 9, bottom to top. Columns are a thru i, left to right. Like a chess board.

Today's puzzle starts with 23 cells filled in as a given. Using the More...

Hi Steve

Found the blog and it looks great. I'll have a closer look with tomorrow's puzzle. Now, what does 'maen' mean?

morning/afternoon/evening/night - you capitalize one of the letters depending on what time it is for you when posting.

Dec. 21, 2007.

SE=7.2

1.UP=27
2.(8)d2=d7-(8=1)e7-df8=(1-7)g8=g2 => g2<>8 UP=37
3.kraken aals(139)dfh7,(47)h7 => h7<>3,g9<>4 UP=39
(139)dfh7-(1)f8=g8-(146=3)g457
||
(7)h7-(7=146)g458
||
(4)h7
4.(2=3)i9-(3=1)g9-a9=a7-f7= (1-5)f8=e9 => e9<>2,a9<>5 UP=43
5.(6=2)d9-(2=3)i9-(3=9)i1-c1=c9 => c9<>6 STE.