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Try eliminating the 1's from row 7, c 1,2,and3... the 1's in row 7 c 7, 8 and 9 force them out. There is also a "hidden pair (the 1 5) in column 3. Also, all the possible values of 8 in the first colu ...

Thanks David I finally got it with the help of several folks who I thanked in another thread - Happy New year to you too!

I discovered that only the amininstrator can set up a poll. I e-mailed him 2 suggestions: 1st, ask users their prefered nominclature for identifying a cell: r1c1; 1,1; a1
2nd - how many hours a week ...

Thx to all for the help on Dec 28 puzzle - Jester and Steve R. were really really helpful Very Happy

Someone_Somewhere: I'm determined to follow your logic but I cannot see why, for example where you say
"From 1-st 3x3 box we know that it has to be in r1c1 or r1c4. So it can't be in r1c9. "

First, ...

Getting a tip from ADB Jester, I downloaded the Sudoku Sensi 1.03 from the site http://sourceforge.net/projects/sudoku-sensei/ but cannot find the executable after unpacking the zip files... anyone k ...

sorry, Munich, I don't understand. I don't see a naked pair of 4 5 atr3c7 - there is also a possible 9 there, nicht wahr?

I thought I'd give the poll feature a try!

Very hard indeed. Can anyone tell me why the "hint" places a 9 in r6c6 after this position? Confused

070 520 630
050 000 070
900 008 002
017 004 000
090 000 060
000 800 310
109 600 005
040 000 096
086 0 ...

After reading Glassman's "Stickler" message about the March 17 puzzle I thought I'd give it a try - and gave up, finally resorting to pencil. I am completely humbled; cannot get past the following:
00 ...

Alan's explanation was correct but I think a shorter version is this: the mandatory pair of (2,4) forces the 3, 6 and 7 into row 7 of region 7. Therefore, there CAN BE NO 3 or 7 in row 7 of region 8. ...

I agree with Alan Rayner- I used the mandatory pairs technique and finished it in a little over 30 minutes. This puzzle gave me less pause than some "mediums" I have pulled my hair out over!

Chris

Luigi, I really like your flash Sudoku!
What part of Italy do you live in? My family is Italian, from the Bari region on my Father's side.

Has anyone bought this e-book (advertized on the Daily Sudoku site). It's $17 U.S. and I'd like some reviews by readers before I "bite". No paid shills, friends or family members of the author please ...

I'm very slow this evening - worked on a difficult Sudoku puzzle in the local newspaper after a big Thanksgiving meal!
Hints are obtained after filling in the draw program and running it the first tim ...

Well Alan I attempted the use of mandatory pairs and still got stuck on Nov 16
Here is where I am
456830900
039400800
008009643
060008400
500000008
841900026
082600000
304285760
605090280

I used the ...

Louise, I should check the Draw program for hints before I write in frustration! I found the problem soon thereafter. Thanks.

I was able to polish off the "hard" and "very hard" puzzles on Mon and Tuesday but the 9-Nov puzzle (medium!) is eating my lunch! Here's where I am - not very far.
006040100
008310020
015009403
000008 ...

I apologize for my last posting. Brad's solver worked fine on the Nov 7 puzzle. I had input it incorrectly! Embarassed

Sorry! Nice program!

Nice look and feel to your flash solver, Bram but dude it blew up on Monday's Nov 7 "very hard" puzzle! Even after I fed additional numbers it couldn't do it.