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A beautiful VH (more than 1 step)....

 
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immpy



Joined: 06 May 2017
Posts: 571
PostPosted: Sun Dec 16, 2018 2:07 pm    Post subject: A beautiful VH (more than 1 step).... Reply with quote
Sink into this one and enjoy... a nice one if I may say so myself.....

Code:

+-------+-------+-------+
| 7 . 6 | 4 . 3 | . . 8 |
| . . . | . . . | . . . |
| . 5 3 | 7 8 . | . . . |
+-------+-------+-------+
| . 2 4 | 1 5 . | 3 . . |
| . . . | . . . | . . . |
| . . 5 | . 7 8 | 4 9 . |
+-------+-------+-------+
| . . . | . 9 7 | 5 4 . |
| . . . | . . . | . . . |
| 6 . . | 5 . 2 | 1 . 7 |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site

cheers....immp
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 942
Location: Rimini, Italy
PostPosted: Sun Dec 16, 2018 2:31 pm    Post subject: Reply with quote
Hi everyone,

Code:

+---------------+-----------+---------------+
| 7    19   6   | 4  12  3  | 29  5    8    |
| 124  18   128 | 9  126 5  | 7   1236 1234 |
| 1249 5    3   | 7  8   16 | 269 126  1249 |
+---------------+-----------+---------------+
| 8    2    4   | 1  5   9  | 3   7    6    |
| 139  1379 17  | 23 46  46 | 8   12   5    |
| 13   6    5   | 23 7   8  | 4   9    12   |
+---------------+-----------+---------------+
| 123  138  128 | 6  9   7  | 5   4    23   |
| 5    347  27  | 8  134 14 | 269 236  239  |
| 6    34   9   | 5  34  2  | 1   8    7    |
+---------------+-----------+---------------+

Play this puzzle online at the Daily Sudoku site

AIC in r7c9
if r7c9=2 we have -2 in r7c13,r8c789
if r7c9=3 - r2c8=3 - r2c5=6 - r1c5=2 - r1c2=1 - r5c2=9 - r5c3=7 - r8c3=2 and we have -2 in r7c13,r8c789

Ciao Gianni
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immpy



Joined: 06 May 2017
Posts: 571
PostPosted: Sun Dec 16, 2018 11:36 pm    Post subject: Reply with quote
If you didn't spot the AIC, or are averse to chains, a pair of traditional VH XY-Wings will solve this puzzle. The first one unlocks the second one.

First XY-Wing is 12-3 pivoted in r6c9 with pincers at r6c1 and r7c9. Thus, r7c1<>3. This elimination, along with a quick rinse, takes the puzzle to the next stage here:

Code:

+--------------+-----------+---------------+
| 7    19  6   | 4  12  3  | 29  5    8    |
| 124  18  128 | 9  126 5  | 7   1236 1234 |
| 1249 5   3   | 7  8   16 | 269 126  1249 |
+--------------+-----------+---------------+
| 8    2   4   | 1  5   9  | 3   7    6    |
| 139  179 17  | 23 46  46 | 8   12   5    |
| 13   6   5   | 23 7   8  | 4   9    12   |
+--------------+-----------+---------------+
| 12   138 128 | 6  9   7  | 5   4    23   |
| 5    347 27  | 8  134 14 | 269 236  239  |
| 6    34  9   | 5  34  2  | 1   8    7    |
+--------------+-----------+---------------+

Play this puzzle online at the Daily Sudoku site

Second XY-Wing is -127 pivoted in r8c3 with pincers at r5c3 and r7c1. Thus r56c1<>1 and r7c3<>1. stte

cheers...immp
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