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fkhalili2002
Joined: 28 May 2006
Posts: 6
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 Posted: Mon Sep 04, 2006 2:21 am Post subject: 2 Aug - Hard |
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Could I please get some help on the next step here? Below is what I have so far. dailysudoku gives me a hint of "1" for R4C3. What is the logic behind that?  Thanks.
XXX 6XX XX2
XXX X3X XX7
XX2 XX4 XX9
X5X XX7 896
X4X XXX X13
6X9 38X X54
1XX 7XX 9XX
4XX X2X XXX
5XX XX8 XX1 |
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Bill Denholm
Joined: 24 Mar 2006
Posts: 17
Location: Mountain View, California
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| Posted: Mon Sep 04, 2006 3:22 am Post subject: |
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That is odd. If I use auto play mode, that is, if I keep asking for hints, that is the 5th move the program makes. I don't understand the logic, either. How, BTW, did you know to play the 8 in R6C5? It is the correct move, but I don't know how you knew that.
Bill |
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fkhalili2002
Joined: 28 May 2006
Posts: 6
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| Posted: Mon Sep 04, 2006 3:41 am Post subject: 2 Aug - Hard |
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Here is how Box 5 looks like (i.e. the possibilities for each cell) after I put "9" in R4C8, "3" in R5C9, "4" in R6C9 and "1" in R9C9.
| Code: |
124 14 7
2589 5689 2569
3 148 12
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Sorry I don't know the tab function works so I can't line them up any better. Anyway, with "12" in R6C6, "14" in R4C5, and "124" in R4C4 you can eliminate the 1's, 2's and 4's from any other cell in Box 5. Also with "278" in R5C1, "78" in R5C3, and "27" in R5C7 you can eliminate the 8's from R5C4 and R5C5, leaving only "8" in R6C5.
Hope this helps. |
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David Bryant
Joined: 29 Jul 2005
Posts: 559
Location: Denver, Colorado
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| Posted: Mon Sep 04, 2006 3:43 am Post subject: Hidden pair in c3r12 |
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Hi, fkhalili2002!
Look closely at columns 1 & 2. Since the values "4" and "5" appear in both these columns already, it's evident that the hidden pair {4, 5} must lie in r1c3 & r2c3 -- there's no other way to fit those values in the top left 3x3 box.
Since "1" can't fit in r1c3 or r2c3, it has to go into r4c3 -- there's no other way to fit a "1" in column 3.
Bill --
There's a naked triplet {1, 2, 4} in r4c4, r4c5, and r6c6, leaving "8" the sole candidate at r6c5. dcb |
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fkhalili2002
Joined: 28 May 2006
Posts: 6
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| Posted: Mon Sep 04, 2006 4:30 am Post subject: Hidden pair in C3r12 |
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Thanks David. I got it. That makes perfect sense and your explanation was very clear. Now I can go on with this puzzle and see where I get stuck again.
Another question. I have looked through the FAQ but can't find information on how to format the numbers within boxes, etc. when I am asking for help. Is there a guide somewhere on this website? There has got to be an easy technique that helps people like Tracy Kiel and Keith use to create nice looking representations of the sudoku puzzles.
Thanks again. |
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TKiel
Joined: 22 Feb 2006
Posts: 292
Location: Kalamazoo, MI
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| Posted: Mon Sep 04, 2006 1:34 pm Post subject: |
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| fkhalili2002 wrote: | There has got to be an easy technique that helps people like Tracy Kiel and Keith use to create nice looking representations of the sudoku puzzles.
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Not sure I like the way that is phrased. Are you saying if it wasn't easy, you don't think I'd be able to do it? 
Actually, it is easy. It's because I use one of the many Sudoku programs that are available. (Click here for the one I use. It's free and the site doesn't sell your info to spammers.) You can use it to generate puzzles in five different levels but now I mainly use it to input puzzles from other sources, such as this one.
| Code: |
*-----------*
|..1|..9|.3.|
|...|.64|...|
|6..|1.8|.75|
|---+---+---|
|..8|...|74.|
|3..|...|..9|
|.94|...|8..|
|---+---+---|
|97.|8.1|..6|
|...|65.|...|
|.1.|7..|3..|
*-----------*
*--------------------------------------------------------------------*
| 24578 2458 1 | 25 27 9 | 246 3 248 |
| 2578 2358 23579 | 235 6 4 | 129 1289 128 |
| 6 234 239 | 1 23 8 | 249 7 5 |
|----------------------+----------------------+----------------------|
| 125 256 8 | 2359 1239 2356 | 7 4 123 |
| 3 256 2567 | 245 12478 2567 | 1256 1256 9 |
| 1257 9 4 | 235 1237 23567 | 8 1256 123 |
|----------------------+----------------------+----------------------|
| 9 7 235 | 8 234 1 | 245 25 6 |
| 248 2348 23 | 6 5 23 | 1249 1289 12478 |
| 2458 1 256 | 7 249 2 | 3 2589 248 |
*--------------------------------------------------------------------*
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This is todays Daily Sudoku puzzle. I press the code button (BBCode) in the 'post a reply' page, go to the program, select 'copy' from the pull down menu, come back here, left click to get a cursor next to the 'code', right click and select 'paste', then press the code button again. Viola! Above is what appears in my post: the starting grid and the pencilmark grid all formatted in a nice, organized manner. Plus, now if YOU want to enter this puzzle into the program all you have to do is click and drag to highlight the starting grid, open the program, select 'paste' from the pull down menu and the puzzle is entered. It couldn't be easier, which I guess is the reason I'm able to do it after all. |
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