The New Sudoku Players' Forum

[ArkieTech]

Code: Select all

 *-----------*
 |..4|.5.|16.|
 |..3|4..|.2.|
 |...|92.|...|
 |---+---+---|
 |.75|.4.|...|
 |...|...|64.|
 |...|..3|..1|
 |---+---+---|
 |..9|...|4..|
 |5..|8..|...|
 |...|.76|.3.|
 *-----------*


Play/Print this puzzle online

[Leren]

Code: Select all

*--------------------------------------------------------------*
| 2789  289   4      | 3     5     78     | 1     6     789    |
| 789   1589  3      | 4     6     178    | 5789  2     5789   |
| 678   1568  1678   | 9     2     178    | 3     578   4      |
|--------------------+--------------------+--------------------|
| 1     7     5      | 6     4    b29     |a28   a89    3      |
| 3    c289  c28     | 257   1    c259    | 6     4     57-2   |
| 2469  2469  26     | 257   8     3      | 257   579   1      |
|--------------------+--------------------+--------------------|
| 2678  1268  9      | 125   3    b25     | 4     1578  25678  |
| 5     3     1267   | 8     9     4      | 27    17    267    |
| 248   1248  128    | 125   7     6      | 2589  3     2589   |
*--------------------------------------------------------------*

ALS XY Wing: (2=9) r4c78 - (9=5) r47c6 - (5=2) r5c236 => - 2 r5c9; lclste

Leren

[SteveG48]

Code: Select all

 *--------------------------------------------------------------------*
 | 2789   289    4      | 3      5      78     | 1      6      789    |
 | 789    1589   3      | 4      6      178    | 5789   2      5789   |
 | 678    1568   1678   | 9      2      178    | 3      578    4      |
 *----------------------+----------------------+----------------------|
 | 1      7      5      | 6      4     b29     |a28     89     3      |
 | 3     d289   d28     | 257    1     c259    | 6      4     e57-2   |
 | 2469   2469   26     | 257    8      3      | 257    579    1      |
 *----------------------+----------------------+----------------------|
 | 2678   1268   9      | 125    3      25     | 4      1578  f25678  |
 | 5      3      1267   | 8      9      4      | 7-2    17    f267    |
 | 248    1248   128    | 125    7      6      | 589-2  3     f2589   |
 *--------------------------------------------------------------------*


(2)r4c7 = (2-9)r4c6 = r5c6 - (9=28)r5c23 - (2)r5c9 = (2)r789c9 => -2 r89c7,r5c9 ; stte

[Leren]

Hmmm ... I could have said : (2=9) r4c78 - (9=5) r47c6 - (5=2) r5c236 - r5c9 = r789c9 => - 2 r5c9, r89c7; stte

Is that cheating ?

Leren

[blue]

Hmmm ... I could have said : (2=9) r4c78 - (9=5) r47c6 - (5=2) r5c236 - r5c9 = r789c9 => - 2 r5c9, r89c7; stte

Is that cheating ?

Maybe this instead ?

Code: Select all

      2r6c4 ------------------------------
     //                                    \
2r6c7                                       2r4c6 = 2r4c7
     \\                                    /
      2r6c123 -(2=89)r5c23 - 9r5c6 = 9r4c6

 => r5c9<>2,r89c7<>2; stte

[daj95376]

_

Since blue opened the door to networks, I'll contribute this from my solver.

Code: Select all

 +-----------------------------------------------------------------------+
 |  2789   289    4      |  3      5      78     |  1      6      789    |
 |  789    1589   3      |  4      6      178    |  5789   2      5789   |
 |  678    1568   1678   |  9      2      178    |  3      578    4      |
 |-----------------------+-----------------------+-----------------------|
 |  1      7      5      |  6      4      29     |  28     89     3      |
 |  3      289    28     |  257    1      259    |  6      4      257    |
 |  2469   2469   26     |  257    8      3      |  257    579    1      |
 |-----------------------+-----------------------+-----------------------|
 |  2678   1268   9      |  125    3      25     |  4      1578   25678  |
 |  5      3      1267   |  8      9      4      |  27     17     267    |
 |  248    1248   128    |  125    7      6      |  2589   3      2589   |
 +-----------------------------------------------------------------------+
 # 96 eliminations remain

 (2=7)r8c7 - r8c3  = r3c3 - r3c8 = 7r6c8 - (7=25)r5c9,r6c7  =>  -2 r4c7
           - r78c8 _____________/
_


In the spirit of extending chains:

Code: Select all

 (2=7)r8c7 - r8c3  = r3c3 - r3c8 = 7r6c8 - (7=25)r5c9,r6c7 - ...
           - r78c8 _____________/

 ... 2r4c7 = (2-9)r4c6 = r5c6 - (9=28)r5c23 - 2r5c9 = 2r789c9 - loop
_


Since I'm poor at resolving network loops, I'll stick with the original elimination.

_

[JC Van Hay]

Code: Select all

+--------------------+-------------+---------------------+
| 2789  289   4      | 3    5  78  | 1     6       789   |
| 789   1589  3      | 4    6  178 | 5789  2       5789  |
| 678   1568  168(7) | 9    2  178 | 3     58(7)   4     |
+--------------------+-------------+---------------------+
| 1     7     5      | 6    4  29  | (28)  -8(9)   3     |
| 3     289   28     | 257  1  259 | 6     4       257   |
| 2469  2469  26     | 257  8  3   | 257   5(79)   1     |
+--------------------+-------------+---------------------+
| 2678  1268  9      | 125  3  25  | 4     158(7)  25678 |
| 5     3     126(7) | 8    9  4   | (27)  1(7)    267   |
| 248   1248  128    | 125  7  6   | 2589  3       2589  |
+--------------------+-------------+---------------------+


9r4c8=(9-7)r6c8=*FXWing(7)[r87c8=*r3c8-r3c3=r8c3]-(7=28)r87c7 :=> -8r4c8
5 Singles; HP(57-2)r5c49; ste

[Marty R.]

Code: Select all

+----------------+-----------+-----------------+
| 2789 289  4    | 3   5 78  | 1    6    789   |
| 789  1589 3    | 4   6 178 | 5789 2    5789  |
| 678  1568 1678 | 9   2 178 | 3    578  4     |
+----------------+-----------+-----------------+
| 1    7    5    | 6   4 29  | 28   89   3     |
| 3    289  28   | 257 1 259 | 6    4    257   |
| 2469 2469 26   | 257 8 3   | 257  579  1     |
+----------------+-----------+-----------------+
| 2678 1268 9    | 125 3 25  | 4    1578 25678 |
| 5    3    1267 | 8   9 4   | 27   17   267   |
| 248  1248 128  | 125 7 6   | 2589 3    2589  |
+----------------+-----------+-----------------+


Play this puzzle online at the Daily Sudoku site

Same elimination as some solutions above.

2r4c7=(2-9)r4c6=r5c6-(9=28)r5c23=>r5c9<>2

Steve: did you go too far or did I stop too soon?

[SteveG48]

Marty, your solution is fine, but it only gives lclste. Extending it gives more eliminations and stte. My prime target was r8c7. The others eliminations were a bonus.

[Marty R.]

Marty, your solution is fine, but it only gives lclste. Extending it gives more eliminations and stte. My prime target was r8c7. The others eliminations were a bonus.

Steve,

OK, I understand. I'm probably in the minority in that I don't pay attention to the stte or lcste, as I consider the puzzle done once no more advanced moves are needed. However, I'm not sure of the meaning of your prime target was r8c7. My solution did take care of that cell.

Cheers,
Marty

[SteveG48]

Marty, your solution is fine, but it only gives lclste. Extending it gives more eliminations and stte. My prime target was r8c7. The others eliminations were a bonus.

Steve,

OK, I understand. I'm probably in the minority in that I don't pay attention to the stte or lcste, as I consider the puzzle done once no more advanced moves are needed. However, I'm not sure of the meaning of your prime target was r8c7. My solution did take care of that cell.

Cheers,
Marty

When I say that my prime target was r8c7, I mean that my intention from the outset was to get an elimination in that cell. The others were a bonus. Your solution took care of r5c9.

[Marty R.]

Marty, your solution is fine, but it only gives lclste. Extending it gives more eliminations and stte. My prime target was r8c7. The others eliminations were a bonus.

Steve,

OK, I understand. I'm probably in the minority in that I don't pay attention to the stte or lcste, as I consider the puzzle done once no more advanced moves are needed. However, I'm not sure of the meaning of your prime target was r8c7. My solution did take care of that cell.

Cheers,
Marty

When I say that my prime target was r8c7, I mean that my intention from the outset was to get an elimination in that cell. The others were a bonus. Your solution took care of r5c9.

Steve, are we just talking about the difference between lcste and stte? Yes, my solution took care of r5c9, but also hits r8c7 because the first elimination locks the r9 2s in box 9. If a stranger or beginner read this exchange, (s)he might not understand that it involves the lcste thing as opposed to an actual solution.

Marty

[SteveG48]

Steve, are we just talking about the difference between lcste and stte? Yes, my solution took care of r5c9, but also hits r8c7 because the first elimination locks the r9 2s in box 9. If a stranger or beginner read this exchange, (s)he might not understand that it involves the lcste thing as opposed to an actual solution.

Marty

Yes, of course. I'm not even talking about the difference between lclste and stte. I'm just talking about the eliminations in the first move.