can you help me solve this one please?

luis55

4-5-1.......69-7--69 ............2----8---3
2-9-8........3--5--4...............7----6---1
6-3-7....... 1--28-28.............45--45---9
- - - - - - -
7-2-6...........489 3489 -1....458-345-58
35-1-4.........28 238 258....9----7----6
359-8-359....7- 469 569...1----345-2
- - - - - - -
1-4-25........268 268 3......,58-9-7
39-7-239....5 2489 289....6-1-48
8-6-59........49 1 7........3-2-45

angusj · Site Admin

Hi luis55.

Firstly, welcome to the Sudoku Programmers forum.
Also, please try and post puzzles in a legible form.
I think I've deciphered you puzzle above but what I get is a puzzle with no solution (so I suspect you've made a mistake in getting this far):

rkral · Posted: Wed Mar 22, 2006 2:42 pm Post subject:

luis55, you have invalidly eliminated digit 3 as a candidate from row 6 col 5. Other than that, your grid looks alright. For your next moves, consider where a 9 can be placed in row 6 ... and where an 8 can be placed in row 4. Does any box have a "lock" on these digits?

luis55 · Posted: Sat Mar 25, 2006 12:49 am Post subject:

Thanks angusj and sorry for my mistake, there’s a 3 missing in r6c5. I’ve been trying my best to post the puzzle in a legible form but without success; wonder if you could help me on that also. (I use Word in a mac computer).
I also missed the basic moves that rkral mentions plus I can eliminate 5 in r6c3 due to 5 in r7c3 and r9c3. But I’m still stuck...

Ruud · Site Admin

Hi Luis,

after the eliminations, your candidate grid looks like this:

angusj · Site Admin

luis55 · Posted: Sat Mar 25, 2006 4:57 pm Post subject:

Hi,
Thanks a lot for your help, this was a 5-star (most difficult) puzzle in the newspaper (Jornal de Noticias, Oporto) but it was not so difficult after all, I just missed a lot of basic moves. Yesterday I downloaded de Susser solver and I hope it will help me to avoid missing the obvious moves. I'm sorry and again, thanks a lot for your help.
Regarding posting the puzzles in legible form, I'm still struggling. I'm using courier as angusj and ruud mention but still not working. Will keep on working on this. Thanks again.

luis55 · Posted: Sat Mar 25, 2006 5:15 pm Post subject:

I found it! The problem in posting a puzzle in the right format was that I was using tabs... I just taped the numbers and did space and put them in line and that did the trick! No tabs! Thanks again.

AndyT · Posted: Mon Mar 27, 2006 1:36 am Post subject:

On the subject of tricky puzzles, I've just found these 2. Interestingly - or maybe not - Angus' program offers no hints very quickly. I get stuck (I refuse to guess). Can any of you gurus offer advice/techniques?

Thanks, Andy

Alpha · Posted: Fri Mar 31, 2006 11:57 am Post subject:

Hello,

I'm learning the solving techniques and I'm stuck with this puzzle:

AndyT · Posted: Fri Mar 31, 2006 1:02 pm Post subject:

Colours on 1

Alpha · Posted: Sat Apr 01, 2006 10:31 am Post subject:

Thanks AndyT, I'm impressed by how soon you answered Smile

I've read a little about the colouring technique, but I still don't know how to do it properly. I'm going to surf by these forums to learn it.

Alpha · Posted: Sat Apr 01, 2006 3:04 pm Post subject:

As you know how to continue, I'd like to make you another question.
I think I finally understood the colouring technique, and I just wanted to check.
In the same puzzle:

angusj · Site Admin