New user - please help with puzzle.

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New user - please help with puzzle.

Postby trevms » Tue May 15, 2018 9:48 pm

Hi there.
Im trying to solve this sudoku puzzle and can't get past the first square (top left corner).
Please can you help (with detailed step so I can learn).
Thanks,
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trevms
 
Posts: 4
Joined: 15 May 2018

Re: New user - please help with puzzle.

Postby Leren » Tue May 15, 2018 11:26 pm

Code: Select all
*-----------*
|.6.|..2|...|
|...|...|76.|
|...|4.1|2..|
|---+---+---|
|.28|...|.79|
|..9|.4.|1..|
|41.|...|58.|
|---+---+---|
|..4|2.6|...|
|.35|...|...|
|...|8..|.3.|
*-----------*

Your puzzle takes a few moves to solve, but they are all very basic. This is where I think you are in your diagram.

Code: Select all
*----------------------------------------------------*
| 589    6    1   | 579  5789 2    | 3   459  458    |
| 589    4    2   | 359  589  359  | 7   6    1      |
| 35789  5789 37  | 4    6    1    | 2   59   58     |
|-----------------+----------------+-----------------|
| 356    2    8   | 1356 15   35   | 4   7    9      |
| 3567   57   9   | 3567 4    8    | 1   2   *36     |
| 4      1    367 | 3679 2    379  | 5   8   *36     |
|-----------------+----------------+-----------------|
| 1789   789  4   | 2    3    6    | 89  15   57     |
| 126789 3    5   | 179  179  479  | 689 14   247-6  |
| 12679  79   67  | 8    1579 4579 | 69  3    2457-6 |
*----------------------------------------------------*

A Pointing Pair of 6's in Box 6 (cells marked *) removes some 6's from r89c9 as shown.

Code: Select all
*----------------------------------------------------*
| 589    6    1   | 579   5789  2    | 3   459 458   |
| 589    4    2   | 359   589   359  | 7   6   1     |
| 35789  5789 37  | 4     6     1    | 2   59  58    |
|-----------------+------------------+---------------|
| 356    2    8   | 1356  15    35   | 4   7   9     |
| 3567   57   9   | 3567  4     8    | 1   2   36    |
| 4      1    367 | 3679  2     379  | 5   8   36    |
|-----------------+------------------+---------------|
| 1789   789  4   | 2     3     6    | 89  15  57    |
| 126789 3    5   | 179   179   479  | 689 14  247   |
| 12679  79   67  | 8    *1579 *4579 | 69  3   247-5 |
*----------------------------------------------------*

A Pointing Pair of 5's in Box 8 removes 5 from r9c9.

Code: Select all
*-----------------------------------------------------*
| 589     6     1   | 579  5789  2     | 3   459 458  |
| 589     4     2   | 359  589   359   | 7   6   1    |
| 35789   5789  37  | 4    6     1     | 2   59  58   |
|-------------------+------------------+--------------|
| 356     2     8   | 1356 15    35    | 4   7   9    |
| 3567    57    9   | 3567 4     8     | 1   2   36   |
| 4       1     367 | 3679 2     379   | 5   8   36   |
|-------------------+------------------+--------------|
| 1789    789   4   | 2    3     6     | 89  15  57   |
| 126789  3     5   | 179  179   479   | 689 14  247  |
| 12-679 *79   *67  | 8    15-79 45-79 |*69  3   24-7 |
*-----------------------------------------------------*

A naked triple (679) in Row 9 (cells marked *) removes 679 from other cells in row 9

Code: Select all
*---------------------------------------------------*
| 589     6    1   | 579   5789  2   | 3   459 458  |
| 589     4    2   | 359   589   359 | 7   6   1    |
| 35789   5789 37  | 4     6     1   | 2   59  58   |
|------------------+-----------------+--------------|
| 356     2    8   | 1356  15    35  | 4   7   9    |
| 3567    57   9   | 3567  4     8   | 1   2   36   |
| 4       1    367 | 3679  2     379 | 5   8   36   |
|------------------+-----------------+--------------|
| 1789    789  4   | 2     3     6   | 89  15  57   |
| 12689-7 3    5   |*179  *179  *479 | 689 14  24-7 |
| 12      79   67  | 8     15    45  | 69  3   24   |
*---------------------------------------------------*

A Pointing Triple of 7's in Box 8 removes 7 from r8c19.

7 in r7c9 is now the only one in Column 9 or Box 9, so it is 7. This is the first of a cascade of singles which completely solves the puzzle.

If you don't understand any of this, let me know and I'll direct you to some good teaching sites.

Leren

PS. You might be able to just use the last 2 moves to solve the puzzle. The naked triple is there in the first diagram, and leads to the pointing triple that solves r7c9 to 7.

Leren
Leren
 
Posts: 3307
Joined: 03 June 2012

Re: New user - please help with puzzle.

Postby trevms » Fri May 25, 2018 3:03 pm

Hey Leren,
Thanks so much.
trevms
 
Posts: 4
Joined: 15 May 2018


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