Tough Sudoku for 17/February/2007

A new blog page that reveals in how to make deductions considering only one type of candidate at a time (I call this coloring), will use today's tough puzzle for the illustrations.

The new page should be available about 2 hours after the new day here at sudoku.com.au.

The page will be available through the link in the upper right column, directly under 'Check out the Sudoku Blog'.

I will attempt to KISS - Keep It Simple S***** !!

color me done!

Nice early morning light

What a thoug !!
Start 23 (given puzzle) up 81
No job for Steve today...

Pretty picture with the water glistening.

Here is wishing everyone a good day and a nice week-end.

HAPPY LUNAR NEW YEAR to all...!

Sure was some cutesy candidate placement. Lots of useless hinges (3 of a candidate in an 'L' shape)Shoulda noticed the hidden 47 earlier although a 2-string kite and, and I HATE these, a finned swordfish, was the key to cracking it without coloring. Have a nice weekend, fellow (UTC -5.00) friends.

yes..really a cakewalk..loved doing it..and the picture is soothing....
cheers

Wow, about 35 mins today (no guesses) I kept checking to see that I was doing the 'tough'
Have a nice Maen all

Very beautiful picture shows the quite of early morning with the reflection of the morning on water surface.

Nice maEn to all.

No guesses today, although it wasn't as easy for me as for Lahire!

Hi Morgan!
Both a finned swordfish and a two string kite are Coloring!

Have a wonderful weekend, everyone, and Happy Chinese New Year to those who'll be celebrating.

13:49; beautiful pic.

Hi, lovely picture but is it a star or UFO in the sky.

1) Start at 23 filled, the given puzzle. Unique Possibilities to (UP) 27.
2) coloring on 7's: b7 == b5 -- f5 == f3 -- h3 == h8, forbids a8 & i7=7 UP 81.

Hi Steve, well, I see them as patterns when I highlight individual numbers. Makes it easy for me to spot locked candidates etc. an x-wing is 2 parallel pairs of a candidate. if they're alone in the rows, eliminate the rest of that number in the columns or visa versa. When I run out of reductions and locked candidates, can no longer see intersecting pairs meeting at a hinge (2-string kite) or parallel connected pairs (skyscraper), or some sort of fish then I start coloring one digit of 2 in a cell , following the chain of conjugate events until there is either a paradox, 2 identical peers in a house or when I run out of valid places to color, then I start coloring the remaining digit, which eliminates any candidate both colors 'see'. Your proof images, showing all candidates for cells and highlighted cells can't be much different than I use for solving puzzles. I use SudoCue. Freeware available on sudoku.net where I learn how to solve tougher puzzles.

Good afternoon to all! That's a relaxing picture to start the weekend.

Beautiful photo. Who's the photographer?

The blinking ad to the right of the puzzle drives me nuts !!

Is that a shooting star?

Didn't anyone notice the COMET?

Susan, you should be able to turn off the 'blinking' ad by clicking on 'Go to the No Animated Ads' link to the right of the puzzle.

'Catch a falling star and put it in a basket, never let it fade away.'

6:46

Catch a falling star and put it in a basket, save it for a rainy day.
For love may come and catch you on the shoulder...
(I can't sing that high bit any more.)

23:02

tsga rfwzoh tplybrk ijhbgyvq tdouxypa nihaqmbtu tuid

nwei auksw kaidbnvh pjkfcnqm jgkynqwhr dqhb deornvpqi http://www.zfcouvjr.wruhlxiap.com

SE=6.7

9:43.