The New Sudoku Players' Forum

[champagne]

Here I need help from solver experts.

.2..5.7.9..71.92...9.327..5..9..83...4..9...2..6...9....29....3.3...259.9...3.42.;32

As far as I can see, this old puzzle has a complex degenerated TH threat in boxes 4578 digits 168

My PM after ...

Code: Select all

|++++++++++++++++++++++++++++++|++++++++++++++++++++++++++++++|++++++++++++++++++++++++++++++|
| 13468     2         1348     | 468       5         46       | 7         13468     9        |
| 34568     568       7        | 1         468       9        | 2         3468      468      |
| 1468      9         148      | 3         2         7        | 168       1468      5        |
|++++++++++++++++++++++++++++++|++++++++++++++++++++++++++++++|++++++++++++++++++++++++++++++|
| 1257      157       9        | 24567     1467      8        | 3         14567     1467     |
| 13578     4         1358     | 567       9         1356     | 168       15678     2        |
| 123578    1578      6        | 2457      147       1345     | 9         14578     1478     |
|++++++++++++++++++++++++++++++|++++++++++++++++++++++++++++++|++++++++++++++++++++++++++++++|
| 145678    15678     2        | 9         14678     1456     | 168       1678      3        |
| 14678     3         148      | 4678      14678     2        | 5         9         1678     |
| 9         15678     158      | 5678      3         156      | 4         2         1678     |
|++++++++++++++++++++++++++++++|++++++++++++++++++++++++++++++|++++++++++++++++++++++++++++++|


[rjamil]

Hi experts,

While I observed a pattern in last few Andrew Stuart's "The Weekly 'Unsolvable' Sudoku Puzzle" page, only one digit repeats within a chute.

Not sure, but is there a connection with hard puzzle with TH? (a stupid question)

R. Jamil

[champagne]

Hi experts,

While I observed a pattern in last few Andrew Stuart's "The Weekly 'Unsolvable' Sudoku Puzzle" page, only one digit repeats within a chute.

Not sure, but is there a connection with hard puzzle with TH? (a stupid question)

R. Jamil

Usually, puzzles with a non degenerated TH have 2 of the three digits with one clue in the corner box outside the four boxes of the pattern.

[rjamil]

Hi champagne

Many thanks for understanding my question (asked in stupid way). This is exactly what I need to know.

There is an eye catching pattern involved in a puzzle which suggest that the puzzle may be solve with at least one TH move.

However, I need a thorough study to understand.

R. Jamil

[ghfick]

Hi champagne,
I gave this puzzle a try.

There is an immediate JE:

Junior Exocet: Base Cells - r7c7,r7c8; Target Cells - r9c2,r8c5; Cross Cells - r123456c259
r9c2<>5,r8c5<>4
r9c2<>1,r8c4<>4,r8c5<>67,r9c3<>5

Then a few placements, then a grouped AIC.
Then, I reached an impasse. I then tried YZF_Sudoku and there are some moves with ALSs and Death Blossoms. Tough for me.

No TH in sight though (that I can see).

ghfick

[champagne]

Hi gordon,
well done, As I am short in time, I would appreciate to get your final PM.
As far as I can see, the degenerated TH must still be there, and the JE could make it much simpler to use

[champagne]

Hi again,

I have a problem, I cannot recognize the exocet, are you sure that it is one??

EDIT the pattern works for digits 678 but not for the digit 1
It seems that this play a key role in the difficulty of the puzzle,linked, I think, to the degenerated TH pattern (s?)

[ghfick]

Code: Select all

,-------------------,--------------------,------------------,
| 1468   2      3   | 48     5      46   | 7    1468   9    |
| 4568   568    7   | 1      468    9    | 2    3      468  |
| 1468   9      148 | 3      2      7    | 168  1468   5    |
:-------------------+--------------------+------------------:
| 127    17     9   | 24567  1467   8    | 3    14567  1467 |
| 1378   4      5   | 67     9      13   | 168  1678   2    |
| 12378  178    6   | 2457   147    1345 | 9    14578  1478 |
:-------------------+--------------------+------------------:
| 15678  15678  2   | 9      14678  146  | 168  1678   3    |
| 14678  3      148 | 678    18     2    | 5    9      1678 |
| 9      678    18  | 5678   3      156  | 4    2      1678 |
'-------------------'--------------------'------------------'



[ghfick]

The JE check with the S cells works for 1, 6, 7 and 8. Each digit is seen in 2 rows. 1 in rows 4 and 6. 6 in rows 2 and 4. 7 in rows 4 and 6. 8 in rows 2 and 6.

[champagne]

The JE check with the S cells works for 1, 6, 7 and 8. Each digit is seen in 2 rows. 1 in rows 4 and 6. 6 in rows 2 and 4. 7 in rows 4 and 6. 8 in rows 2 and 6.

Agreed, I was wrong thinking that the digit "1" did not force one of the target cells.
I checked carefully, no doubt, one of these cells is needed to have one solution when the digit "1" is in the base

sorry, we have a full JE