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Tough Sudoku for 12/July/2006


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

  1 2 3 4 5 6 7 8 9
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Submitted by: Gath

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A very good view from a plane!
and many guesses...
12:07 one bad guess Maen
The Alps?

The puzzle today seemed to be fairly logical eliminations..
13:34 with a guess. Have a great Maen, everyone.
'tis raining and I have time to do the puzzle, but it is a dissappointment. Very easy..
1) Start at 22 filled - the given puzzle. Unique Possibilities to 24 filled. (UP 24).
2) Locked 7's at h789 forbids g79,i89=7. UP 27.
3) swordfish on 3's: e1 == g1 -- g7 == c7 -- c4 == e4 forbids g2,e5,c8=3 UP 81
sets:4 max depth 3. rating .08.
easy today:
1. Start at 22. UP 24
2. Locked 7s in col h, elim in Bh8; UP 27
3. Locked 4s in Bh2, elim in col
4. Locked 5s in Bh2, elim in col; UP28
5. Hidden pair a2=c3=59, elim in box
6. Locked 2s in Bb2, elim in col
7. Locked 4s in Bb2. elim in row
8. Fc: If c4=3 => More...
hi Steve, didn't see your proof, I think I avoided the swordfish using 2 forbidding chains, right?
16.45 Beautiful mountain peaks!! Reminds me of when I flew to Italy & saw the Alps poking through the clouds. Magnificient!!
Not sure if it's the Alps, though it seems reasonable.

I needed two guesses today...
good puzzle,started out tough then flowed into place nicely.
Good mAen to all. An airborne shot of which mountains?
A high altitude test.

Want to say hi to new friends granniemo, susan (texas) and LKinMN in chatroom yesterday. I cured my insomnia by staying awake all day and falling into heavy sleep! ZZZZZZZZZzzzzzzzzz! Catch up with you again in chatroom soon? :)
Hi nic - yes we looked at exactly the same strong sets with the 3's. In fact, I saw the coloring eliminations, then realized it was a swordfish.
with the try snd error technique,once!
Not too bad.
todays puzzle seemed fairly easy but i like the picture
Hi Everyone,

I've just added a new feature: Now members can record their solving times and view them all later. When you solve a puzzle you will be asked if you want to save the time. To view the times, click on the 'Members' link in the main menu.

Since today's puzzle was not too challenging, I took the time to look at the puzzle of July 4 - it seemed to be a monster. It has been taimed a tad, but the proof I published for it is still not ideal.
forgot to start timer after a pause
not too difficult today
nice photo
have a great day/night one and all
19:53 after setup. DIdn't notice the swordfish, did with colors but probably same thing. COOL picture!

I'm fairly new to sudoku but this site caught my attention recently. However, it is difficult for a newbie to catch up with the notation (not always the same) used in describing solutions. Is there a quick summary of conventions used somewhere?
9:42 no guesses
Hi ray - the conventions used are not standard at this site - unfortunately. There are some standards:
grid: columns are letters a thru i a is bottom left
rows are numbers 1 thru 9. 1 is bottom left.

forbidding chain notation explanation available thru proof link at bottom of page. - More...
Somehow I managed to do this puzzle without the swordfish. I don't mean to brag, and I don't particularly care to go back and try again, but I did it. This was an easy Tough.
8:27 Easiest Tough so far.
syec hilmpz vlcbfehpo fcdmwjlup logje wyhmkp jfkzy
23/May/07 5:50 AM
Aug. 24, 2007.
24/Aug/07 9:52 PM

05/Sep/10 9:12 PM
07/Nov/19 10:13 PM
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