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Sep 30 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 941
Location: Rimini, Italy
PostPosted: Fri Sep 30, 2022 9:21 am    Post subject: Sep 30 VH Reply with quote
Hi everyone,

Code:

+----------+-----------+--------+
| 34  2  7 | 5  49  39 | 6  8 1 |
| 346 36 1 | 47 8   37 | 2  5 9 |
| 9   8  5 | 1  6   2  | 4  7 3 |
+----------+-----------+--------+
| 2   4  6 | 3  17  57 | 15 9 8 |
| 8   7  3 | 49 149 59 | 15 6 2 |
| 1   5  9 | 8  2   6  | 3  4 7 |
+----------+-----------+--------+
| 35  39 2 | 79 579 4  | 8  1 6 |
| 7   1  4 | 6  3   8  | 9  2 5 |
| 56  69 8 | 2  59  1  | 7  3 4 |
+----------+-----------+--------+

Play this puzzle online at the Daily Sudoku site

Quote:
XY-Wing 4,7,9 in r1c5,r27c4 and -9 in r79c5
or
W-Wing 4,9 in r1c5,r5c4 SL with number 9 in r15c6 and -4 in r2c4,r5c5


Ciao Gianni
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TomC



Joined: 30 Oct 2020
Posts: 358
Location: Wales
PostPosted: Fri Sep 30, 2022 9:43 am    Post subject: another way Reply with quote
r5c6 = 5 to solve

XY chain a-d gives pincers of <9> in a + d to remove <9> from x
Code:

+----------+--------------+--------+
| 34  2  7 |  5   49  a39 | 6  8 1 |
| 346 36 1 | c47  8   b37 | 2  5 9 |
| 9   8  5 |  1   6    2  | 4  7 3 |
+----------+--------------+--------+
| 2   4  6 |  3   17   57 | 15 9 8 |
| 8   7  3 | d49  149 x59 | 15 6 2 |
| 1   5  9 |  8   2    6  | 3  4 7 |
+----------+--------------+--------+
| 35  39 2 |  79  579  4  | 8  1 6 |
| 7   1  4 |  6   3    8  | 9  2 5 |
| 56  69 8 |  2   59   1  | 7  3 4 |
+----------+--------------+--------+
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 941
Location: Rimini, Italy
PostPosted: Sun Oct 02, 2022 9:55 am    Post subject: Reply with quote
Hi everyone,

from r1c5
r1c5=4 -4 in r1c1,r2c4
ric5=9 r5c6=9 r5c4=4 -4 in r2c4 r2c1=4 -4 in r1c1

from r1c1
r1c1=3 -3 in r2c2,r7c1
r1c1=4 r1c5=9 r9c2=9 r7c2=3 -3 in r2c2,r7c1

from r7c4
r7c4=9 -9 in r7c2,r9c5
r7c4=7 r2c4=4 r1c5=9 r9c2=9 -9 in r7c2,r9c5

Ciao Gianni
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