The New Sudoku Players' Forum

[Hefner413]

I am stuck on this one. Can you guys help? Thanks.. I’m still a bit of a beginner.

[SpAce]

I am stuck on this one. Can you guys help? Thanks.. I’m still a bit of a beginner.

You have successfully solved all the basics, but at least one non-basic step is still required. Probably the easiest is to eliminate 4r5c2, after which it's just singles. Various single-digit patterns or fishes can be found that do it for you:

Code: Select all

.----------------.--------------.---------------.
| 3   *48    2   | 9    1     5 | *46  68    7  |
| 1    9     7   | 46   68    3 |  2   5    *48 |
| 5    6     48  | 24   28    7 |  9   1     3  |
:----------------+--------------+---------------:
| 6   *348  *458 | 1    35    2 | *45  7     9  |
| 27   3-4   459 | 567  3569  8 |  1   36   *24 |
| 27   1     59  | 567  3569  4 |  56  368   28 |
:----------------+--------------+---------------:
| 4    7     3   | 25   25    6 |  8   9     1  |
| 9    2     6   | 8    7     1 |  3   4     5  |
| 8    5     1   | 3    4     9 |  7   2     6  |
'----------------'--------------'---------------'

2-String Kite: (4)r1c2 = r1c7 - r2c9 = (4)r5c9 => -4 r5c2; stte
Turbot Crane: (4)r1c2 = r1c7 - r4c7 = (4)r5c9 => -4 r5c2; stte
Grouped Skyscraper: (4)r1c2 = r1c7 - r4c7 = (4)r4c23 => -4 r5c2; stte
Finned X-Wing: (4)R14\c7[c2b4] => -4 r5c2; stte

[Hefner413]

I am stuck on this one. Can you guys help? Thanks.. I’m still a bit of a beginner.

You have successfully solved all the basics, but at least one non-basic step is still required. Probably the easiest is to eliminate 4r5c2, after which it's just singles. Various single-digit patterns or fishes can be found that do it for you:

Code: Select all

.----------------.--------------.---------------.
| 3   *48    2   | 9    1     5 | *46  68    7  |
| 1    9     7   | 46   68    3 |  2   5    *48 |
| 5    6     48  | 24   28    7 |  9   1     3  |
:----------------+--------------+---------------:
| 6   *348  *458 | 1    35    2 | *45  7     9  |
| 27   3-4   459 | 567  3569  8 |  1   36   *24 |
| 27   1     59  | 567  3569  4 |  56  368   28 |
:----------------+--------------+---------------:
| 4    7     3   | 25   25    6 |  8   9     1  |
| 9    2     6   | 8    7     1 |  3   4     5  |
| 8    5     1   | 3    4     9 |  7   2     6  |
'----------------'--------------'---------------'

2-String Kite: (4)r1c2 = r1c7 - r2c9 = (4)r5c9 => -4 r5c2; stte
Turbot Crane: (4)r1c2 = r1c7 - r4c7 = (4)r5c9 => -4 r5c2; stte
Grouped Skyscraper: (4)r1c2 = r1c7 - r4c7 = (4)r4c23 => -4 r5c2; stte
Finned X-Wing: (4)R14\c7[c2b4] => -4 r5c2; stte

Wow! Such a wealth of info here. Looks like I first need to learn these notations. But you’ve given me a starting point. Thank you!!!!

[Mauriès Robert]

Hi Hefner413,
You can also use the Technical of tracks that generalizes everything SpAce has proposed to you, like this :
- with an anti-track
P'(4r1c2): -4r1c2->4r1c7->4r5c9 => -4r5c2 which sees 4r1c2 and 4r5c9, stte.
- or with two conjugated tracks
P(4r1c2): 4r1c2
P(4r1c7): 4r1c7->4r5c9 => -4r5c2 which sees 4r1c2 and 4r5c9, stte.
I let you find the other approaches with this technique.
Robert