Sting in the tail

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Sting in the tail

Postby m_b_metcalf » Tue Aug 30, 2022 3:54 pm

This 17-clue puzzle has an unusually long solution path, and a sting in the tail:
Code: Select all
 . 5 . . 4 . 3 . .
 2 . . . . . . 7 .
 . . . . . . . . .
 . . . 6 . 2 . 8 .
 . 3 1 . . . . . .
 . . . 7 . . . . .
 6 . . 2 . . . . .
 . . . . . . 4 . 3
 . . . . 1 . 5 . .

.5..4.3..2......7.............6.2.8..31.........7.....6..2...........4.3....1.5..


Regards,

Mike
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Re: Sting in the tail

Postby P.O. » Tue Aug 30, 2022 7:20 pm

basics:
Hidden Text: Show
Code: Select all
( n1r6c6   n2r3c5   n3r6c8   n3r4c5 )

intersections:
((((7 0) (7 5 8) (5 7 8 9)) ((7 0) (8 5 8) (5 6 7 8 9)))
 (((6 0) (5 7 6) (2 6 7 9)) ((6 0) (5 8 6) (2 4 5 6 9)) ((6 0) (5 9 6) (2 4 5 6 7 9)))
 (((4 0) (5 4 5) (4 5 8 9)) ((4 0) (5 6 5) (4 5 8 9)))
 (((2 0) (5 7 6) (2 6 7 9)) ((2 0) (6 7 6) (2 9)))
 (((2 0) (5 7 6) (2 6 7 9)) ((2 0) (5 8 6) (5 6 9)) ((2 0) (5 9 6) (5 6 7 9)))
 ( n8r6c1   n5r6c5   n4r6c9   n7r5c1   n6r5c9   n5r5c8   n4r3c8   n2r5c7   n9r6c7 )
 (((6 0) (8 8 9) (1 2 6 9)) ((6 0) (9 8 9) (2 6 9))))

QUAD ROW: ((1 1 1) (1 9)) ((1 4 2) (1 8 9)) ((1 8 3) (1 2 9)) ((1 9 3) (1 2 8 9))
(((1 3 1) (6 7 8 9)) ((1 6 2) (6 7 8 9)))

QUAD ROW: ((7 5 8) (7 8 9)) ((7 7 9) (1 7 8)) ((7 8 9) (1 9)) ((7 9 9) (1 7 8 9))
(((7 2 7) (1 4 7 8 9)) ((7 3 7) (3 4 5 7 8 9)) ((7 6 8) (3 4 5 8 9)))

( n4r7c2   n9r4c2   n4r2c3   n4r4c1   n5r4c3   n5r8c1   n3r7c3  n5r7c6   n9r9c1 
  n1r1c1   n3r3c1   n1r8c2   n9r3c3   n1r7c8 )

intersection:
((((8 0) (8 3 7) (2 7 8)) ((8 0) (9 3 7) (2 7 8))))

PAIR COL: ((1 4 2) (8 9)) ((8 4 8) (8 9)) 
(((2 4 2) (1 3 5 8 9)) ((3 4 2) (1 5 8)) ((5 4 5) (4 8 9)) ((9 4 8) (3 4 8)))

( n4r5c4   n3r9c4   n3r2c6   n4r9c6   n6r9c8 )

X-WING ROW: n9 (2 7) (5 9)
(((1 9 3) (2 8 9)) ((5 5 5) (8 9)) ((8 5 8) (6 7 8 9)))

( n8r5c5   n9r5c6 )

intersections:
((((8 0) (8 4 8) (8 9)) ((8 0) (8 6 8) (6 8)))
 (((8 0) (7 7 9) (7 8)) ((8 0) (7 9 9) (7 8 9))) ( n8r9c3 ))
 

Code: Select all
r1n6{c6 c3} - c3n7{r1 r8} - r8c5{n7 n6} => r8c6 <> 6
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Re: Sting in the tail

Postby RSW » Tue Aug 30, 2022 8:17 pm

Code: Select all
 +-----------+--------------+-------------+
 | 1 5  *6-7 | 89 4    b67  | 3   29 289  |
 | 2 68  4   | 15 689   3   | 168 7  1589 |
 | 3 678 9   | 15 2     678 | 168 4  158  |
 +-----------+--------------+-------------+
 | 4 9   5   | 6  3     2   | 17  8  17   |
 | 7 3   1   | 4  89    89  | 2   5  6    |
 | 8 26  26  | 7  5     1   | 9   3  4    |
 +-----------+--------------+-------------+
 | 6 4   3   | 2  789   5   | 78  1  789  |
 | 5 1  a278 |a89 6789 a689 | 4  a29 3    |
 | 9 27  278 | 3  1     4   | 5   6  278  |
 +-----------+--------------+-------------+

(7=2896)r8c3468 - (6=7)r1c6 => -7r1c3; stte
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Re: Sting in the tail

Postby Leren » Tue Aug 30, 2022 9:15 pm

Code: Select all
*------------------------------------------*
| 1 5   a67  | 89  4     7-6 | 3   29 289  |
| 2 68   4   | 15  689   3   | 168 7  1589 |
| 3 678  9   | 15  2     678 | 168 4  158  |
|------------+---------------+-------------|
| 4 9    5   | 6   3     2   | 17  8  17   |
| 7 3    1   | 4   89    89  | 2   5  6    |
| 8 26   26  | 7   5     1   | 9   3  4    |
|------------+---------------+-------------|
| 6 4    3   | 2   789   5   | 78  1  789  |
| 5 1   b278 | 89 c6789 d689 | 4   29 3    |
| 9 27   278 | 3   1     4   | 5   6  278  |
*------------------------------------------*

M Wing Type 2A : (6=7) r1c3 - r8c3 = (7-6) r8c5 = (6) r8c6 => - 6 r1c6; stte

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