The New Sudoku Players' Forum

[ArkieTech]

Code: Select all

 *-----------*
 |...|...|...|
 |.59|3.7|18.|
 |.6.|.8.|.3.|
 |---+---+---|
 |.8.|6.5|.1.|
 |..2|.7.|8..|
 |.4.|8.9|.5.|
 |---+---+---|
 |.2.|.5.|.4.|
 |.73|1.4|62.|
 |...|...|...|
 *-----------*


Play/Print this puzzle online

[Leren]

Code: Select all

*--------------------------------------------------------------*
| 137   13    8      | 59    146   126    | 24579 679   24679  |
| 2     5     9      | 3     46    7      | 1     8     46     |
| 17    6     4      | 59    8     12     | 2579  3     279    |
|--------------------+--------------------+--------------------|
| 39    8     7      | 6    a23    5      | 249   1     2349   |
| 5     139   2      | 4     7     1-3    | 8     69    369    |
| 136   4    b16     | 8    a123   9      | 27    5     237    |
|--------------------+--------------------+--------------------|
| 169   2    c16     | 7     5    c38     | 39    4    c18     |
| 8     7     3      | 1     9     4      | 6     2     5      |
| 4     19    5      | 2     6-3   368    | 379   79    18     |
*--------------------------------------------------------------*

ALS XY Wing: (3=1) r46c5 - (1=6) r6c3 - (6=3) r7c369 => - 3 r5c6, r9c5; stte

<Edit> Replaced solution after error pointed out by daj95376

Leren

[JC Van Hay]

Code: Select all

+-----------------+-----------------+--------------------+
| 137  13      8  | 59  146    126  | 24579  679   24679 |
| 2    5       9  | 3   46     7    | 1      8     46    |
| 17   6       4  | 59  8      12   | 2579   3     279   |
+-----------------+-----------------+--------------------+
| 39   8       7  | 6   2(3)   5    | 249    1     2349  |
| 5    3-1(9)  2  | 4   7      (13) | 8      69    369   |
| 136  4       16 | 8   12(3)  9    | 27     5     237   |
+-----------------+-----------------+--------------------+
| 169  2       16 | 7   5      38   | 39     4     18    |
| 8    7       3  | 1   9      4    | 6      2     5     |
| 4    1(9)    5  | 2   6(3)   368  | (379)  (79)  18    |
+-----------------+-----------------+--------------------+


[(1=3)r5c6-3r46c5=NT(379)r9c578-9r9c2=9r5c2]-1r5c2; ste

[ArkieTech]

Code: Select all

 *--------------------------------------------------------------------*
 | 137    13     8      | 59     146    126    | 24579  679    24679  |
 | 2      5      9      | 3      46     7      | 1      8      46     |
 | 17     6      4      | 59     8      12     | 2579   3      279    |
 |----------------------+----------------------+----------------------|
 | 39     8      7      | 6      23     5      | 249    1      2349   |
 | 5      39-1   2      | 4      7     c13     | 8      69     369    |
 | 136    4     a16     | 8      23-1   9      | 27     5      237    |
 |----------------------+----------------------+----------------------|
 | 169    2     b16     | 7      5     b38     | 39     4     b18     |
 | 8      7      3      | 1      9      4      | 6      2      5      |
 | 4      19     5      | 2      36     368    | 379    79     18     |
 *--------------------------------------------------------------------*
(1=6)r6c3-(6=3)r7c369-(3=1)r5c6 => -1r5c2,r6c5; ste

[SteveG48]

Code: Select all

 *--------------------------------------------------------------------*
 | 137   e13     8      | 59    d146   c126    | 24579  679    24679  |
 | 2      5      9      | 3      46     7      | 1      8      46     |
 | 17     6      4      | 59     8     c12     | 2579   3      279    |
 *----------------------+----------------------+----------------------|
 | 39     8      7      | 6      23     5      | 249    1      2349   |
 | 5    cf139    2      | 4      7     b13     | 8      69     369    |
 | 136    4      16     | 8      123    9      | 27     5      237    |
 *----------------------+----------------------+----------------------|
 | 169    2      16     | 7      5     a38     | 39     4      1-8    |
 | 8      7      3      | 1      9      4      | 6      2      5      |
 | 4     g19     5      | 2      36     368    | 379    79    h18     |
 *--------------------------------------------------------------------*


(8=3)r7c6 - (3=1)r5c6 - *r5c2,r13c6 = r1c5 - (1=3)r1c2 - (3*1=9)r5c2 - (9=1)r9c2 - (1=8)r9c9 => -8 r7c9 ; stte

[Ngisa]

Code: Select all

+------------+------------+-----------------+
| 137 13  8  | 59 a146 26-1 | 24579 679 24679 |
| 2   5   9  | 3  a46  7   | 1     8   46    |
| 17  6   4  | 59 8   2-1  | 2579  3   279   |
+------------+------------+-----------------+
| 39  8   7  | 6  23  5   | 249   1   2349  |
| 5   e139 2  | 4  7   f13  | 8     69  369   |
| 136 4   16 | 8  123 9   | 27    5   237   |
+------------+------------+-----------------+
| 169 2   16 | 7  5   368 | 39    4   18    |
| 8   7   3  | 1  9   4   | 6     2   5     |
| 4   d19  5  | 2  b36  368 | c379   c79  18    |
+------------+------------+-----------------+


(1=46)r12c5-(6=3)r9c5-(3=79)r9c78-(9=1)r9c2-r5c2=(1)r5c6 => -1r1c6, r3c6; stte.

[Marty R.]

Code: Select all

+------------+------------+-----------------+
| 137 13  8  | 59 146 126 | 24579 679 24679 |
| 2   5   9  | 3  46  7   | 1     8   46    |
| 17  6   4  | 59 8   12  | 2579  3   279   |
+------------+------------+-----------------+
| 39  8   7  | 6  23  5   | 249   1   2349  |
| 5   139 2  | 4  7   13  | 8     69  369   |
| 136 4   16 | 8  123 9   | 27    5   237   |
+------------+------------+-----------------+
| 169 2   16 | 7  5   38  | 39    4   18    |
| 8   7   3  | 1  9   4   | 6     2   5     |
| 4   19  5  | 2  36  368 | 379   79  18    |
+------------+------------+-----------------+


Play this puzzle online at the Daily Sudoku site

Same elimination of 1 from r5c2 as some solutions above.

XY-Wing (38-1), pivot r7c6, with transport.

(1=3)r5c6-(3=8)r7c6-(8=1)r7c9-r9c9=r9c2=>r5c2<>1

[daj95376]

Code: Select all

*--------------------------------------------------------------*
| 17    3     8      | 59    146   126    | 24579 679   24679  |
| 2     5     9      | 3     46    7      | 1     8     46     |
| 17    6     4      | 59    8     12     | 2579  3     279    |
|--------------------+--------------------+--------------------|
| 3-9   8     7      | 6     2     5      | 49    1     349    |
| 5    a19    2      | 4     7    b13     | 8     69    369    |
| 36    4     16     | 8     13    9      | 27    5     27     |
|--------------------+--------------------+--------------------|
|e69    2     16     | 7     5    c38     |d39    4     18     |
| 8     7     3      | 1     9     4      | 6     2     5      |
| 4     1-9   5      | 2     36    368    | 379   79    18     |
*--------------------------------------------------------------*

(9=1) r5c2 - (1=3) r5c6 - r7c6 = (3-9) r7c7 = (9) r7c1 => - 9 r4c1, r9c2; stte

Everyone else has <139> in r5c2.

[Marty R.]

Code: Select all

*--------------------------------------------------------------*
| 17    3     8      | 59    146   126    | 24579 679   24679  |
| 2     5     9      | 3     46    7      | 1     8     46     |
| 17    6     4      | 59    8     12     | 2579  3     279    |
|--------------------+--------------------+--------------------|
| 3-9   8     7      | 6     2     5      | 49    1     349    |
| 5    a19    2      | 4     7    b13     | 8     69    369    |
| 36    4     16     | 8     13    9      | 27    5     27     |
|--------------------+--------------------+--------------------|
|e69    2     16     | 7     5    c38     |d39    4     18     |
| 8     7     3      | 1     9     4      | 6     2     5      |
| 4     1-9   5      | 2     36    368    | 379   79    18     |
*--------------------------------------------------------------*

(9=1) r5c2 - (1=3) r5c6 - r7c6 = (3-9) r7c7 = (9) r7c1 => - 9 r4c1, r9c2; stte

Everyone else has <139> in r5c2.

Danny, I had 19 in r5c2 but I added a 3 when I saw everyone else had 139. With just the 19, I think an M-Wing on 39 with transport takes out the 3 from r7c6 and solves it.

[Sudtyro2]

... but I added a 3 when I saw everyone else had 139...

Maybe a good point to ask the question: What are the criteria for the "starting" grid? Not at all clear to me.

SteveC

[Leren]

daj95376 wrote: Everyone else has <139> in r5c2.

Your quite right I should have had 3 in r5c2 so I've replaced my solution. Thanks for spotting the error.

Leren

[Leren]

Sudtyro2 wrote: Maybe a good point to ask the question: What are the criteria for the "starting" grid? Not at all clear to me.

The starting grid is after what is often described on this forum as "Basics". Basics include an initial clue mark-off, consequent Singles, Locked Candidates Type 1 (Pointing) and Type 2 (Claiming), Naked and Hidden Pairs, Triples and Quads.
Basics do not include simple fish (Xwings, Swordfish and Jellyfish).

Basics should not be confused with SSTS (Simple Sudoku Technique Set) which (according to Sudopedia) includes : Naked Singles, Hidden Singles, Naked Pairs, Locked Candidates, Naked Triples, Naked Quads, Hidden Pairs, X-Wings, Swordfish, Simple Colors, Multi-Colors, Hidden Triples, XY-Wings and Hidden Quads.

I was half asleep yesterday and I should have had a 3 in r5c2 so there's no confusion in what the starting grid is supposed to be.

Leren

[SteveG48]

... but I added a 3 when I saw everyone else had 139...

Maybe a good point to ask the question: What are the criteria for the "starting" grid? Not at all clear to me.

SteveC

Steve, I had the same question when I first got here. You might want to look at this thread: dan-s-decline-november-24-2013-t31489.html

[Marty R.]

Sudtyro2 wrote: Maybe a good point to ask the question: What are the criteria for the "starting" grid? Not at all clear to me.

The starting grid is after singles, pointing and claiming pairs and triples, naked and hidden pairs, triples and quads, but does not include basic fish (Xwings, Swordfish and Jellyfish).
I was half asleep yesterday and I should have had a 3 in r5c2 so there's no confusion in what the starting grid is supposed to be.

Leren

Leren,

I think the general understanding is that Locked Candidates (or box-line interactions) are also included.

pointing and claiming pairs and triples,

After eight years of this nonsense, I think this is the first time I've seen those terms. What are they?

[ArkieTech]

After eight years of this nonsense, I think this is the first time I've seen those terms. What are they?

It is fun! I like After LCLS Locked Candidates and Locked Sets.