The New Sudoku Players' Forum

[ArkieTech]

Code: Select all

 *-----------*
 |.56|48.|...|
 |7.9|..5|..6|
 |...|...|..5|
 |---+---+---|
 |3..|..6|8..|
 |..7|...|6..|
 |..4|3..|..9|
 |---+---+---|
 |1..|...|...|
 |4..|7..|5.1|
 |...|.43|29.|
 *-----------*


Play/Print this puzzle online

[SteveG48]

Code: Select all

 *--------------------------------------------------------------------*
 | 2      5      6      | 4      8     b179    |c1379   137    37     |
 | 7      134    9      | 2      13     5      | 14     8      6      |
 | 8      134    13     | 69     13679  179    | 1479   2      5      |
 *----------------------+----------------------+----------------------|
 | 3      12     125    | 59     12579  6      | 8      1457   247    |
 | 9      128    7      | 58     125    4      | 6      135    23     |
 | 56     1268   4      | 3      1257   127-8  | 17     157    9      |
 *----------------------+----------------------+----------------------|
 | 1      2379   238    | 5689   2569 af289    |d37     3467   3478   |
 | 4      239    238    | 7     f269  af289    | 5     e36     1      |
 | 56     67     58     | 1      4      3      | 2      9      78     |
 *--------------------------------------------------------------------*


(8=29)r78c6 - 9r1c6 = (9-3)r1c7 = 3r7c7 - (3=6)r8c8 - (6=289)b8p356 => -8 r6c6 ; stte

[JC Van Hay]

Code: Select all

+---------------+-----------------------+--------------------+
| 2   5     6   | 4        8       179  | 1379  137     37   |
| 7   134   9   | 2        13      5    | 14    8       6    |
| 8   134   13  | 69       13679   179  | 1479  2       5    |
+---------------+-----------------------+--------------------+
| 3   12    125 | 59       12579   6    | 8     1457    247  |
| 9   128   7   | (58)     125     4    | 6     (135)   23   |
| 56  1268  4   | 3        1257    1278 | (17)  157     9    |
+---------------+-----------------------+--------------------+
| 1   2379  238 | 9-8(56)  29(56)  289  | (37)  347(6)  3478 |
| 4   239   238 | 7        269     289  | 5     (36)    1    |
| 56  67    58  | 1        4       3    | 2     9       78   |
+---------------+-----------------------+--------------------+


[HP(56)r7c45=(6)r7c8-(6=3)r8c8-XYWing(137)r67c7.r5c8=NP(58)r5c48]-(8)r7c4; stte

[Ngisa]

Code: Select all

+-------------------+--------------------------+--------------------------+
| 2     5       6   |    4       8        179  |    1379    137     a37   |
| 7     134     9   |    2       13       5    |    14      8        6    |
| 8     134     13  |    69      13679    179  |    1479    2        5    |
+-------------------+--------------------------+--------------------------+
| 3    c12     c125 |    59      12579    6    |    8       1457     47-2 |
| 9     18-2    7   |    58      125      4    |    6       135     a23   |
| 56    1268    4   |    3       1257     1278 |    17      157      9    |
+-------------------+--------------------------+--------------------------+
| 1     2379    238 |    5689    2569     289  |    37      3467     3478 |
| 4     239     238 |    7       269      289  |    5       36       1    |
| 56    67     b58  |    1       4        3    |    2       9       a78   |
+-------------------+--------------------------+--------------------------+


(2=8)r159c9 - (8=5)r9c3 - (5=2)r4c23 => - 2 r4c9, r5c2; stte

Clement

[Sudtyro2]

Hi Clement,
Another good AIC, but the eliminations are not stte. FWIW, I like to use the A/S online solver to check if a potential elimination (or placement) is stte.
Any solver step showing a "yes" beyond the first method (1. Hidden Singles) will not lead to a stte solution.

BTW, for yesterday's puzzle, I submitted an ADP-solution (and then a quick withdrawal) after a final solver check of the internals' elimination indicated a non-stte solution. Turns out I had mismarked three cells in my working grid. Ouch!

SteveC

[Cenoman]

Code: Select all

 +--------------------+------------------------+-----------------------+
 |  2    5      6     |  4      8      d179v   | c1379w  137    37     |
 |  7    134    9     |  2      13      5      |  14     8      6      |
 |  8    134    13    |  69     13679   179    |  1479   2      5      |
 +--------------------+------------------------+-----------------------+
 |  3    12     125   |  59     12579   6      |  8      1457   247    |
 |  9    128    7     |  58     125     4      |  6      135    23     |
 |  56   1268   4     |  3      1257    127-8  |  17     157    9      |
 +--------------------+------------------------+-----------------------+
 |  1    2379  a238*  |  5689   2569   e289uz* | b37x    3467   3478   |
 |  4    239   A238*  |  7      269z  eB289uz* |  5      36y    1      |
 |  56   67     58    |  1      4       3      |  2      9      78     |
 +--------------------+------------------------+-----------------------+

UR(28)r78c36 using internals
(3)r7c3 - r7c7 = (3-9)r1c7 = r1c6 - (9=8)r78c6
(3-8)r8c3 = (8)r8c6
(9)r78c6 - r1c6 = (9-3)r1c7 = r7c7 - (3=6)r8c8 - (6=8)b8p356
=> -8 r6c6; stte

Cenoman

[Ngisa]

Hi Clement,
Another good AIC, but the eliminations are not stte. FWIW, I like to use the A/S online solver to check if a potential elimination (or placement) is stte.
Any solver step showing a "yes" beyond the first method (1. Hidden Singles) will not lead to a stte solution.

BTW, for yesterday's puzzle, I submitted an ADP-solution (and then a quick withdrawal) after a final solver check of the internals' elimination indicated a non-stte solution. Turns out I had mismarked three cells in my working grid. Ouch!

SteveC

After eliminating 2 in r4c9 analysis in Box 5 leaves a single 9 in r4c4 which completes it without using locked sets. May be I am not clear on the term stte.

[Sudtyro2]

After eliminating 2 in r4c9 analysis in Box 5 leaves a single 9 in r4c4 which completes it without using locked sets. May be I am not clear on the term stte.

Given a starting possibility matrix, the forum rules allow for only one "advanced" move (step). After that, only singles (naked or hidden) are allowed to solve the puzzle, which is the stte designation (singles to the end). Your one advanced move was the AIC. Your "analysis in Box 5" must have included some other move(s), probably from the "basics" group, and this is not allowed.

Just for reference, you can use the A/S solver at http://www.sudokuwiki.org/sudoku.htm
to review the conventional basics. These are the first six strategies listed by the solver.

If needed, we can work this further via private mail.

SteveC