The New Sudoku Players' Forum

[tarek]

A Beauty

Will not solve it to STTE but can you spot the Mutant Swordfish?

Code: Select all

+-------+-------+-------+
| . 9 . | . . 8 | 7 . 3 |
| . 1 . | . . . | . . . |
| . . 8 | 1 4 . | . . 5 |
+-------+-------+-------+
| . 2 . | 3 . . | . . 9 |
| . . . | . 2 . | . . . |
| 8 . . | . . 9 | . 7 . |
+-------+-------+-------+
| 3 . . | . 5 7 | 9 . . |
| . . . | . . . | . 8 . |
| 2 . 7 | 9 . . | . 6 . |
+-------+-------+-------+
.9...87.3.1.........814...5.2.3....9....2....8....9.7.3...579.........8.2.79...6.


Play this puzzle online

Download Sukaku Explainer

[Leren]

Code: Select all

*--------------------------------------------*
| 45    9   d245  | 5-2 6  8    | 7   1  3   |
| 56    1   c2356 | 7   9 b235  | 246 24 8   |
| 67    367  8    | 1   4 a23   | 26  9  5   |
|-----------------+-------------+------------|
| 146   2    146  | 3   7  46   | 8   5  9   |
| 45679 467  4569 | 8   2  456  | 1   3  46  |
| 8     346  3456 | 456 1  9    | 24  7  246 |
|-----------------+-------------+------------|
| 3     8    146  | 46  5  7    | 9   24 124 |
| 1469  46   1469 | 246 3  1246 | 5   8  7   |
| 2     5    7    | 9   8  14   | 3   6  14  |
*--------------------------------------------*

M Wing : (2=3) r3c6 - r2c6 = (3-2) r2c3 = (2) r1c3 => - 2 r1c4; stte

Leren

[SpAce]

Hi tarek,

Will not solve it to STTE but can you spot the Mutant Swordfish?

I’m away from my computer, so this is just based on visual observation of Leren’s pencil marks (and typing on my phone, which I hate). If I spot correctly, only 4,5,6 can have single-digit eliminations. Of those, I can’t see anything on 6s. There’s an obvious Finned Mutant X-Wing (Kite) on 5s, but that doesn’t count either. On 4s I can see this:

Cannibal Mutant Swordfish: (4)R9B56\r6c69 => -4 r6c23,r8c6,r7c9 (Rank 0) & r6c9 (Rank 1, cannibalistic)

Did I get it right? I can’t double-check myself until tomorrow.

Added. This should give the same eliminations without cannibalism:

Mutant Jellyfish: (4)R9C78B5\r26c6b9 => -4 r6c239,r7c9,r8c6 (Rank 0)

[tarek]

Hi tarek,

Will not solve it to STTE but can you spot the Mutant Swordfish?

I’m away from my computer, so this is just based on visual observation of Leren’s pencil marks (and typing on my phone, which I hate). If I spot correctly, only 4,5,6 can have single-digit eliminations. Of those, I can’t see anything on 6s. There’s an obvious Finned Mutant X-Wing (Kite) on 5s, but that doesn’t count either. On 4s I can see this:

Cannibal Mutant Swordfish: (4)R9B56\r6c69 => -4 r6c23,r8c6,r7c9 (Rank 0) & r6c9 (Rank 1, cannibalistic)

Did I get it right? I can’t double-check myself until tomorrow.

Added. This should give the same eliminations without cannibalism:

Mutant Jellyfish: (4)R9C78B5\r26c6b9 => -4 r6c239,r7c9,r8c6 (Rank 0)

Spot on for both ... You can use also c4 in the base (instead of b5) & cover with b8 for more variety in both

tarek

[tarek]

Code: Select all

+-------------------+-------------------+-------------------+
|%45    9    %245   | 5-2   6     8     | 7     1     3     |
|%56    1     2356  | 7     9     235   | 246   24    8     |
|%67   %367   8     | 1     4    *23    | 26    9     5     |
+-------------------+-------------------+-------------------+
| 146   2     146   | 3     7     46    | 8     5     9     |
| 45679 467   4569  | 8     2     456   | 1     3     46    |
| 8     346   3456  | 456   1     9     | 24    7     246   |
+-------------------+-------------------+-------------------+
| 3     8     146   | 46    5     7     | 9     24    124   |
| 1469  46    1469  | 246   3     1246  | 5     8     7     |
| 2     5     7     | 9     8     14    | 3     6     14    |
+-------------------+-------------------+-------------------+

M Wing : (2=3) r3c6 - r2c6 = (3-2) r2c3 = (2) r1c3 => - 2 r1c4;stte

A different approach:

Code: Select all

+-------------------+-------------------+-------------------+
|%45    9    %245   | 5-2    6     8    | 7     1     3     |
|%56    1     2356  | 7     9     235   | 246   24    8     |
|%67   %367   8     | 1     4    *23    | 26    9     5     |
+-------------------+-------------------+-------------------+
| 146   2     146   | 3     7     46    | 8     5     9     |
| 45679 467   4569  | 8     2     456   | 1     3     46    |
| 8     346   3456  | 456   1     9     | 24    7     246   |
+-------------------+-------------------+-------------------+
| 3     8     146   | 46    5     7     | 9     24    124   |
| 1469  46    1469  | 246   3     1246  | 5     8     7     |
| 2     5     7     | 9     8     14    | 3     6     14    |
+-------------------+-------------------+-------------------+
UVWXYZ-wing r1c4<>2; stte

[Ngisa]

Code: Select all

+----------------------+------------------+------------------+
| 45       9      245  | 25     6    8    | 7      1     3   |
|a56       1      2356 | 7      9    23-5 |b246    24    8   |
| 67       367    8    | 1      4    23   |c26     9     5   |
+----------------------+------------------+------------------+
| 146      2      146  | 3      7   g46   | 8      5     9   |
| 4679-5   467    4569 | 8      2   g456  | 1      3     46  |
| 8        346    3456 | 456    1    9    |c24     7    d246 |
+----------------------+------------------+------------------+
| 3        8      146  | 246    5    7    | 9      24   e124 |
| 1469     46     1469 | 246    3    1246 | 5      8     7   |
| 2        5      7    | 9      8   g14   | 3      6    f14  |
+----------------------+------------------+------------------+


(5=6)r2c1 - r2c7 = (62)r36c7 - (2)r6c9 = (2-1)r7c9 = r9c9 - (1=465)r945c6 => - 5r2c6,r5c1; stte

Clement

[Cenoman]

Cannibal Mutant Swordfish: (4)R9B56\r6c69 => -4 r6c23,r8c6,r7c9 (Rank 0) & r6c9 (Rank 1, cannibalistic)
Mutant Jellyfish: (4)R9C78B5\r26c6b9 => -4 r6c239,r7c9,r8c6 (Rank 0)

You can use also c4 in the base (instead of b5) & cover with b8 for more variety in both

Now that you have drawn attention to the 4s, I see also this grouped Swordfish:

Code: Select all

 +-----------------------+--------------------+-------------------+
 |  45      9     245    |  25    6    8      |  7     1    3     |
 |  56      1     2356   |  7     9    235    |  246   24   8     |
 |  67      367   8      |  1     4    23     |  26    9    5     |
 +-----------------------+--------------------+-------------------+
 | c146*    2    c146*   |  3     7   d46*    |  8     5    9     |
 | b45679* b467* b4569*  |  8     2   a456*   |  1     3   a46*   |
 |  8       36-4  356-4  |  456   1    9      |  24    7    26-4  |
 +-----------------------+--------------------+-------------------+
 |  3       8     146    |  46    5    7      |  9     24   12-4  |
 |  1469    46    1469   |  246   3    126-4  |  5     8    7     |
 |  2       5     7      |  9     8   a14*    |  3     6   a14*   |
 +-----------------------+--------------------+-------------------+

- as a matrix (3x3 PM, symmetric -> rank 0):

Code: Select all

   C6      C9      B4
 4r9c6   4r9c9
 4r5c6   4r5c9    4r5c123
 4r4c6            4r4c13
--------------------------
 -4r8c6  -4r67c9  -4r6c23

- as a fish (correctness not guaranteed) (4)R459\C69B4 => -4 r8c6, r67c9, r6c23
- as an AIC: Loop XW(4)R59\c69 = r5c123 - r4c13 = r4c6 => same eliminations

Solution of the puzzle:

Code: Select all

 +-----------------------+--------------------+-------------------+
 |  45      9     245    |  25    6    8      |  7     1    3     |
 |  56      1     2356   |  7     9    235    |  246   24   8     |
 |  67      367   8      |  1     4    23     |  26    9    5     |
 +-----------------------+--------------------+-------------------+
 |  146     2     146    |  3     7    46     |  8     5    9     |
 |  45679   467   4569   |  8     2    456    |  1     3    46    |
 |  8       346   3456   |  456   1    9      |  24    7    246   |
 +-----------------------+--------------------+-------------------+
 |  3       8     146    |  46    5    7      |  9     24   124   |
 |  1469    46    1469   |  246   3    1246   |  5     8    7     |
 |  2       5     7      |  9     8    14     |  3     6    14    |
 +-----------------------+--------------------+-------------------+

Death Blossom, stem (367)r3c2
(3)r3c2 - (3=25)b2p19
(6)r3c2 - (6=5)r2c1
(7)r3c2 - (7=465)r5c269
=> -5 r2c6; ste

[SteveG48]

Code: Select all

 *--------------------------------------------------------------------*
 | 45     9      245    |b25     6      8      | 7      1      3      |
 | 56     1      2356   | 7      9      235    | 246    24     8      |
 | 67     67-3   8      | 1      4     b23     | 26     9      5      |
 *----------------------+----------------------+----------------------|
 | 146    2      146    | 3      7      46     | 8      5      9      |
 | 45679  467    4569   | 8      2      456    | 1      3      46     |
 | 8     a346    3456   |a456    1      9      |a24     7     a246    |
 *----------------------+----------------------+----------------------|
 | 3      8      146    | 46     5      7      | 9      24     124    |
 | 1469   46     1469   | 246    3      1246   | 5      8      7      |
 | 2      5      7      | 9      8      14     | 3      6      14     |
 *--------------------------------------------------------------------*


(3=2465)r6c2479 - (5=23)b2p19 => -3 r2c2 ; stte

[SpAce]

Spot on for both ... You can use also c4 in the base (instead of b5) & cover with b8 for more variety in both.

Ok, thanks for confirming it. Good point about the alternate base\cover option.

[SpAce]

- as a fish (correctness not guaranteed) (4)R459\C69B4 => -4 r8c6, r67c9, r6c23

Looks good to me. That would be a Franken Swordfish in UFG terms.

[rjamil]

Code: Select all

 +---------------------+-----------------+--------------+
 | 45     9    (2)-45  | (5-2)  6  8     | 7    1   3   |
 | 56     1    (3-2)56 | 7      9  2(35) | 246  24  8   |
 | 67     367  8       | 1      4  23    | 26   9   5   |
 +---------------------+-----------------+--------------+
 | 146    2    146     | 3      7  46    | 8    5   9   |
 | 45679  467  4569    | 8      2  456   | 1    3   46  |
 | 8      346  3456    | 456    1  9     | 24   7   246 |
 +---------------------+-----------------+--------------+
 | 3      8    146     | 46     5  7     | 9    24  124 |
 | 1469   46   1469    | 246    3  1246  | 5    8   7   |
 | 2      5    7       | 9      8  14    | 3    6   14  |
 +---------------------+-----------------+--------------+

Strong Wing: SL 3 @ r2c36 5 @ r2c6 r1c4 2 @ r12c3 2 @ r1c34 => -45 @ r1c3 => -2 @ r2c3 r1c4; stte

R. Jamil

[tarek]

- as a fish (correctness not guaranteed) (4)R459\C69B4 => -4 r8c6, r67c9, r6c23

Looks good to me. That would be a Franken Swordfish in UFG terms.

A true monster catch. It has 10 vertices
r5 is not easy to spot because it is not an EmA type of grouped strong link.

tarek

[SpAce]

- as a fish (correctness not guaranteed) (4)R459\C69B4 => -4 r8c6, r67c9, r6c23

A true monster catch. It has 10 vertices

Yes, it’s very cool. I’m quite sure I would have never spotted such a Loch Ness monster directly. In fact, I’m not sure if I’ve ever spotted a Franken fish as such. In this case there’s an easy transformation from my mutant, though:

Code: Select all

 r9b56\r6c69   | +b4
r9b456\r6c69b4 |  b456 -> r456
 r4569\r6c69b4 | -r6
  r459\c69b4

[SpAce]

M Wing : (2=3) r3c6 - r2c6 = (3-2) r2c3 = (2) r1c3 => - 2 r1c4;stte

UVWXYZ-wing r1c4<>2; stte

Both are very nice, and basically opposite sides of the same coin — the M-Wing being ALS+AHS while the UVWXYZ-Wing being ALS+ALS:

Code: Select all

M2-Wing:     (23)r3c62 = (32)r21c3       => -2 r1c4
UVWXYZ-Wing: (23)r3c62 = (76542)b1p87413 => -2 r1c4

[pjb]

The first mutant SF I get is: (4) r4c24\r8b45, fin r7c4 => -4 r8c6. It is then followed by an unfinned mutant SF: (4)r9b56\r6c69; then another finned mutant SF (5)r1c6b4\r5c3b2, fin r1c1.

For a STTE solution I found slight variation: (2)r1c3 = (2-5)r1c4 = (5-3)r2c6 = r2c3 => -2 r2c3

Phil