The New Sudoku Players' Forum

[Hud]

I'm pretty well at an impasse on this VH Pappocom Puzzle. At least it'll give me some more grid posting practice:

Code: Select all

+-------+-------+-------+
|     7 |     8 |   6 4 |
|       |     2 |   9   |
|     8 |       |       |
+-------+-------+-------+
|       |   4 9 |       |
|   9 1 |       | 4 2   |
|       | 3 7   |       |
+-------+-------+-------+
|       |       | 3     |
|   6   | 5     |       |
| 4 3   | 9     | 1     |
+-------+-------+-------+

Code: Select all

+-----------------+-----------------+-----------------+
| 39     25   7   | 1    39   8     | 25   6    4     |
| 1356   145  346 | 467  356  2     | 578  9    13578 |
| 123569 1245 8   | 467  3569 34567 | 257  13   12357 |
+-----------------+-----------------+-----------------+
| 35678  3578 36  | 2    4    9     | 5678 13   13578 |
| 37     9    1   | 68   568  56    | 4    2    37    |
| 2568   2458 46  | 3    7    1     | 5689 58   589   |
+-----------------+-----------------+-----------------+
| 178    178  259 | 4678 1268 467   | 3    4578 256789|
| 178    6    29  | 5    1238 347   | 2789 478  2789  |
| 4      3    25  | 9    268  67    | 1    578  25678 |
+-----------------+-----------------+-----------------+

[ihope127]

Forced move at R1C4, pins at block 5, naked pair at row 1, hidden pairs at column 8 and row 5, hidden triplet at block 7, intersection of C7 and B6, intersection of C8 and B9, intersection of B7 and C3, naked triplet at row 8, intersection of R8 and B9, pins at row 9, row 5, and column 5, forced moves, pins at row 3, row 4 and row 6 and row 7, and some final forced moves.

[SarC]

If you look at column 8, you will see a candidate locked to one box only. This means you can remove that candidate from columns 7 and 9 in that box.
After this you should look for a naked triple...

When you are posting a grid, its best to use a character other than a space, to symbolise a cell that have more than one candidate. This makes its possible to copy-and-paste your grid to a computerized solver program.

Like this:

Code: Select all

 . . 7 | . . 8 | . 6 4
 . . . | . . 2 | . 9 .
 . . 8 | . . . | . . .
-------+-------+------
 . . . | . 4 9 | . . .
 . 9 1 | . . . | 4 2 .
 . . . | 3 7 . | . . .
-------+-------+------
 . . . | . . . | 3 . .
 . 6 . | 5 . . | . . .
 4 3 . | 9 . . | 1 . .
 
 

Cheers

Edit: ihope127 replied while I was typing, so you can disregard this

[ihope127]

When you are posting a grid, its best to use a character other than a space, to symbolise a cell that have more than one candidate. This makes its possible to copy-and-paste your grid to a computerized solver program.

I was able to pop that directly into the Susser.

[SarC]

I stand corrected.
Susser eats it, but Simple Sudoku doesn't and I don't think most programs will, but I might be wrong. I have to change the code in my solver to accept that input, anywayz Thanks for correcting me.

[angusj]

Susser eats it, but Simple Sudoku doesn't and I don't think most programs will, but I might be wrong.

Yes you are wrong as Simple Sudoku has no problems finding the solution. (Perhaps you made a mistake when copying the grid.)

[SarC]

Susser eats it, but Simple Sudoku doesn't and I don't think most programs will, but I might be wrong.

Yes you are wrong as Simple Sudoku has no problems finding the solution. (Perhaps you made a mistake when copying the grid.)

We are not talking about finding the solution, but pasting this grid into the program:

Code: Select all

+-------+-------+-------+
|     7 |     8 |   6 4 |
|       |     2 |   9   |
|     8 |       |       |
+-------+-------+-------+
|       |   4 9 |       |
|   9 1 |       | 4 2   |
|       | 3 7   |       |
+-------+-------+-------+
|       |       | 3     |
|   6   | 5     |       |
| 4 3   | 9     | 1     |
+-------+-------+-------+

And that I can't do in Simple Sudoku.

[Hud]

SarC, I think the locked candidate 7 in col 8 was the prime suspect in this case. I've been under-the-weather for several days and am not thinking as clearly as I should be.

As to posting grids, does it all mean that I should have put dots in the blank places in code 1? I was actually quite proud of this attempt all-in-all.

[ihope127]

As to posting grids, does it all mean that I should have put dots in the blank places in code 1? I was actually quite proud of this attempt all-in-all.

The Susser's preferred form:

Code: Select all

+-------+-------+-------+
| . . 7 | . . 8 | . 6 4 |
| . . . | . . 2 | . 9 . |
| . . 8 | . . . | . . . |
+-------+-------+-------+
| . . . | . 4 9 | . . . |
| . 9 1 | . . . | 4 2 . |
| . . . | 3 7 . | . . . |
+-------+-------+-------+
| . . . | . . . | 3 . . |
| . 6 . | 5 . . | . . . |
| 4 3 . | 9 . . | 1 . . |
+-------+-------+-------+

[angusj]

We are not talking about finding the solution, but pasting this grid into the program

OK. I obviously missed that. Sorry for the confusion.