The New Sudoku Players' Forum

[ArkieTech]

Code: Select all

 *-----------*
 |.4.|.6.|..9|
 |32.|549|.8.|
 |1..|3..|...|
 |---+---+---|
 |...|617|..8|
 |...|...|...|
 |7..|985|...|
 |---+---+---|
 |...|..6|..1|
 |.6.|194|.72|
 |2..|.7.|.4.|
 *-----------*


Play/Print this puzzle online

[SpAce]

Code: Select all

.-------------------.---------.------------------.
| 58    4     58    | 7  6  1 | 23    23    9    |
| 3     2     6-7   | 5  4  9 | 1     8    a6[7] |
| 1   b(7)9   679   | 3  2  8 | 56-7  56    4    |
:-------------------+---------+------------------:
| 49    359   23459 | 6  1  7 | 2459  259   8    |
| 6     589   589   | 4  3  2 | 579   1     57   |
| 7     1     24    | 9  8  5 | 246   26    3    |
:-------------------+---------+------------------:
| 49    3789  34789 | 2  5  6 | 389   39    1    |
| 58    6     358   | 1  9  4 | 358   7     2    |
| 2    b59    1     | 8  7  3 | 569   4    a56   |
'-------------------'---------'------------------'

(7=65)r29c9 - (5=97)r9c2 => -7 r2c3,r3c7; btte

Added:

Code: Select all

.-----------------------.---------.----------------.
|  58   4      58       | 7  6  1 | 23    23    9  |
|  3    2     a6[7]     | 5  4  9 | 1     8    b67 |
|  1    79     679      | 3  2  8 | 567   56    4  |
:-----------------------+---------+----------------:
| d49   359    23459    | 6  1  7 | 2459  259   8  |
|  6   c589   c589      | 4  3  2 | 579   1    c57 |
|  7    1      24       | 9  8  5 | 246   26    3  |
:-----------------------+---------+----------------:
| e49   3789  e3(4)89-7 | 2  5  6 | 389   39    1  |
|  58   6      358      | 1  9  4 | 358   7     2  |
|  2    59     1        | 8  7  3 | 569   4     56 |
'-----------------------'---------'----------------'

(7)r2c3 = r2c9 - (7=589)r5c932 - r4c1 = (94)r7c13 => -7 r7c3; stte

Edit 2: corrected a typo

[Leren]

Code: Select all

*---------------------------------------*
| 58 4     58    | 7 6 1 | 23    23  9  |
| 3  2    g67    | 5 4 9 | 1     8   67 |
| 1  9-7  g679   | 3 2 8 |a567   56  4  |
|----------------+-------+--------------|
|d49 359   23459 | 6 1 7 |c2459 c259 8  |
| 6  589   589   | 4 3 2 |b579   1   57 |
| 7  1     24    | 9 8 5 | 246   26  3  |
|----------------+-------+--------------|
|e49 3789 f34789 | 2 5 6 | 389   39  1  |
| 58 6     358   | 1 9 4 | 358   7   2  |
| 2  59    1     | 8 7 3 | 569   4   56 |
*---------------------------------------*

(7) r3c7 = (7-9) r5c7 = r4c78 - r4c1 = (9-4) r7c1 = (4-7) r3c2 = (7) r23c3 => - 7 r3c2; stte

Leren

[SpAce]

(7) r3c7 = (7-9) r5c7 = r4c78 - r4c1 = (9-4) r7c1 = (4-7) r3c2 = (7) r23c3 => - 7 r3c2; stte

A bit shorter expression for the same:

(7)r3c7 = (79)b6p412 - r4c1 = (94,7)r7c132 => -7 r3c2; stte

[Ngisa]

Code: Select all

+-----------------------+---------------+---------------------+
| 58     4        58    | 7     6     1 | 23       23      9  |
| 3      2        67    | 5     4     9 | 1        8      e7-6|
| 1     c79       679   | 3     2     8 |d567      56      4  |
+-----------------------+---------------+---------------------+
| 49     359      23459 | 6     1     7 | 2459     259     8  |
| 6      589      589   | 4     3     2 | 579      1       57 |
| 7      1        24    | 9     8     5 | 246      26      3  |
+-----------------------+---------------+---------------------+
| 49     3789     34789 | 2     5     6 | 389      39      1  |
| 58     6        358   | 1     9     4 | 358      7       2  |
| 2     b59       1     | 8     7     3 | 569      4      a56 |
+-----------------------+---------------+---------------------+


(6=5)r9c9 - (5=9)r9c2 - (9=7)r3c2 - r3c7 = (7)r2c9 => - 6r2c9; stte

Clement

[SpAce]

(6=5)r9c9 - (5=9)r9c2 - (9=7)r3c2 - r3c7 = (7)r2c9 => - 6r2c9; stte

Not stte. Just like this which you didn't correct.

[Ngisa]

(6=5)r9c9 - (5=9)r9c2 - (9=7)r3c2 - r3c7 = (7)r2c9 => - 6r2c9; stte

Not stte. Just like this which you didn't correct.

I din't use locked sets. It depends on the way you go around it. We should use btte as suggested by Steve, because, lcste,lcte,stte etc. are all basics and btte includes all.

[Sudtyro2]

Code: Select all

+-------------------+------------+---------------+
|  58   4     58    | 7   6   1  |  23    23  9  |
|  3    2     67    | 5   4   9  |  1     8   67 |
|  1   f79    679   | 3   2   8  | e567   56  4  |
+-------------------+------------+---------------+
| b49#  359   23459 | 6   1   7  |  2459  259 8  |
|  6   c589  c589   | 4   3   2  | d579   1   57 |
|  7    1     24    | 9   8   5  |  246   26  3  |
+-------------------+------------+---------------+
| a49   3789  34789 | 2   5   6  |  389   39  1  |
|  58   6     358   | 1   9   4  |  358   7   2  |
|  2    5-9   1     | 8   7   3  |  569   4   56 |
+-------------------+------------+---------------+

(9)r7c1 = r4c1 - r5c23 = (9-7)r5c7 = r3c7 - (7=9)r3c2 => -9 r9c2; stte

Or, drop the first node to get the remote-fin(#) chain needed for:
Sashimi kraken 9:1-Fish c1\r9 + fr7c1 + rfr4c1 => -9 r9c2; stte

Caution: Show

The "Sashimi 1-Fish" has a cover sector without any base candidates, so it's not really a fish per current UFG standards. However, the elimination logic does seem to work correctly. See here for detailed discussions.

SteveC

[SpAce]

(6=5)r9c9 - (5=9)r9c2 - (9=7)r3c2 - r3c7 = (7)r2c9 => - 6r2c9; stte

Not stte. Just like this which you didn't correct.

I din't use locked sets.

Actually, I've wondered why we don't use btte (basics to the end) instead of lclste.

You are right. We should use btte. Because it depends on how you go around it, I did not use locked sets in completing it.

It makes no difference. Even if you only need locked candidates, as both of your mentioned solutions did, it's still not stte. We use stte only for cases when nothing else but singles is needed to finish, which is why it's considered the most sought-after finish. If you incorrectly mark your non-stte finishes as stte, and refuse to correct them or even admit a mistake, you're basically adding undeserved value to your solution.

Did you notice that I marked my first solution as "btte"? Your solution has the same exact effect (using the same cells too) so it can't be stte any more than mine (both need a "locked candidates" move to finish). The correct options to mark it would be "lclste" (the standard), or "btte" (exactly the same), or "lcte" (if you want to underscore that it doesn't include locked sets). The same thing with your June 5 solution. The only incorrect options are "stte" and "lste", and for some unknown reason you chose one of them both times.

It depends on the way you go around it. We should use btte as suggested by Steve, because, lcste,lcte,stte etc. are all basics and btte includes all.

I think you missed Steve's point. While they all could be included under "btte" (or "lclste"), I don't think anyone here (except maybe you) would want to lose the stte vs btte/lclste distinction (stte solutions are often harder to achieve, which makes them more valuable -- that's why I had two solutions today, because I wasn't satisfied with the first btte finish). Steve's suggestion of "btte" means exactly the same thing as "lclste", but it's just easier to write and to understand. No other difference what so ever.

The correct interpretation for "lclste" is "locked candidates and/or locked sets (and singles) to the end", and it's the same for the suggested "btte". On the other hand, "stte" means "singles only to the end", which means you can't use it if you need either locked candidates or locked sets or both (in addition to singles) to finish.

[Cenoman]

Code: Select all

 +----------------------+-----------------+--------------------+
 |  58   4      58      |  7    6    1    | a23#   b23    9    |
 |  3    2     B67      |  5    4    9    |  1      8     67   |
 |  1    9-7   B679     |  3    2    8    | g567    56    4    |
 +----------------------+-----------------+--------------------+
 | d49   359    23459*  |  6    1    7    |  2459*  259   8    |
 |  6   e589   e589     |  4    3    2    | f579    1     57   |
 |  7    1      24*     |  9    8    5    |  246*   26    3    |
 +----------------------+-----------------+--------------------+
 | c49   3789  A34789#  |  2    5    6    |  389   b39    1    |
 |  58   6      358     |  1    9    4    |  358    7     2    |
 |  2    59     1       |  8    7    3    |  569    4     56   |
 +----------------------+-----------------+--------------------+

UR(24)r46c37 using externals
(2)r1c7 - (23=9)r17c8 - r7c1 = r4c1 - r5c23 = (9-7)r5c7 = (7)r7c7
(4-7)r7c3 = (7)r23c3
=> -7 r3c2; ste