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immpy
Joined: 06 May 2017
Posts: 574
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 Posted: Tue Nov 26, 2019 6:25 pm Post subject: An extreme VH 112619 |
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Hello all, this is rated VH on the Draw/Play, should be solvable using only VH techniques. I found it quite challenging. Enjoy the puzzle...
| Code: |
+-------+-------+-------+
| 3 . . | . . . | . . 1 |
| . 9 . | . 2 . | . 6 . |
| 2 . 6 | . 3 . | 5 . 7 |
+-------+-------+-------+
| 5 . . | 7 . 3 | . . 2 |
| . . . | . . . | . . . |
| 8 . . | 1 . 4 | . . 6 |
+-------+-------+-------+
| 6 . 5 | . 7 . | 1 . 3 |
| . 3 . | . 1 . | . 2 . |
| 4 . . | . . . | . . 5 |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site
cheers...immp |
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ZeroAssoluto
Joined: 05 Feb 2017
Posts: 996
Location: Rimini, Italy
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| Posted: Fri Nov 29, 2019 9:26 am Post subject: |
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Hi everyone,
| Code: |
+--------------+----------------+--------------+
| 3 5 78 | 689 4 6789 | 2 89 1 |
| 17 9 1478 | 58 2 1578 | 3 6 48 |
| 2 148 6 | 89 3 189 | 5 489 7 |
+--------------+----------------+--------------+
| 5 46 49 | 7 689 3 | 489 1 2 |
| 19 1467 1349 | 268 5689 268 | 4789 35 489 |
| 8 27 239 | 1 59 4 | 79 35 6 |
+--------------+----------------+--------------+
| 6 28 5 | 2489 7 289 | 1 48 3 |
| 79 3 789 | 4568 1 568 | 4689 2 489 |
| 4 128 1289 | 3 68 268 | 689 7 5 |
+--------------+----------------+--------------+
|
Play this puzzle online at the Daily Sudoku site
AIC in r3c2
if r3c2=4 -4 in r2c3,r45c2
if r3c2 is not 4 r3c8=4, r7c8=8, r7c2=2, r6c2=7, r6c7=9, r9c3=9, r4c3=4 and -4 in r2c3,r45c2
and simple
Ciao Gianni |
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Clement
Joined: 24 Apr 2006
Posts: 1113
Location: Dar es Salaam Tanzania
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| Posted: Fri Nov 29, 2019 10:10 pm Post subject: An advanced Extreme 021019 |
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| Code: |
+----------------------+------------------------+----------------------+
| 3 5 78 | 689 4 6789 | 2 89 1 |
| 17 9 g1478 | 58 2 1578 | 3 6 h48 |
| 2 148 6 | 89 3 189 | 5 i489 7 |
+----------------------+------------------------+----------------------+
| 5 46 f49 | 7 689 3 | 489 1 2 |
|f19 1467 1349 | 268 5689 268 | 4789 35 c489 |
| 8 b27 2379 | 1 59 4 |b79 35 6 |
+----------------------+------------------------+----------------------+
| 6 a28 5 | 2489 7 289 | 1 j4-8 3 |
|e79 3 789 | 4568 1 568 | 4689 2 d489 |
| 4 128 1289 | 3 68 268 | 689 7 5 |
+----------------------+------------------------+----------------------+
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(8=2)r7c2 - (2=79)r6c27 - (9)r5c9 = r8c9 - r8c1 = (94)b4p43 - (4)r2c3 = r2c9 - r3c8 = (4)r7c8 => - 8r7c8; stte |
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immpy
Joined: 06 May 2017
Posts: 574
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| Posted: Thu Dec 12, 2019 4:33 pm Post subject: |
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After basics the puzzle should look like this...or something close to this.
Without resorting to chains, one can identify an early X-Wing.
X-Wing 9 c19r58=>r5c357,r8c37<>9. | Code: |
+--------------+----------------+--------------+
| 3 5 78 | 689 4 6789 | 2 89 1 |
| 17 9 1478 | 58 2 1578 | 3 6 48 |
| 2 148 6 | 89 3 189 | 5 489 7 |
+--------------+----------------+--------------+
| 5 46 49 | 7 689 3 | 489 1 2 |
| 19 1467 1349 | 268 5689 268 | 4789 35 489 |
| 8 27 239 | 1 59 4 | 79 35 6 |
+--------------+----------------+--------------+
| 6 28 5 | 2489 7 289 | 1 48 3 |
| 79 3 789 | 4568 1 568 | 4689 2 489 |
| 4 128 1289 | 3 68 268 | 689 7 5 |
+--------------+----------------+--------------+
|
Play this puzzle online at the Daily Sudoku site |
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immpy
Joined: 06 May 2017
Posts: 574
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| Posted: Thu Dec 12, 2019 5:09 pm Post subject: |
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Puzzle should now look like this....
| Code: |
+--------------+---------------+-------------+
| 3 5 78 | 689 4 6789 | 2 89 1 |
| 17 9 1478 | 58 2 1578 | 3 6 48 |
| 2 148 6 | 89 3 189 | 5 489 7 |
+--------------+---------------+-------------+
| 5 46 49 | 7 689 3 | 489 1 2 |
| 19 1467 134 | 268 568 268 | 478 35 489 |
| 8 27 239 | 1 59 4 | 79 35 6 |
+--------------+---------------+-------------+
| 6 28 5 | 2489 7 289 | 1 48 3 |
| 79 3 78 | 4568 1 568 | 468 2 489 |
| 4 128 1289 | 3 68 268 | 689 7 5 |
+--------------+---------------+-------------+
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Play this puzzle online at the Daily Sudoku site
Identify the Naked Pair (7,8) in c3 and make eliminations.
Finish by identifying the XY-Wing -149 r24c3,r5c1=>r2c1,r5c3<>1.
cheers...immp |
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WorldO
Joined: 04 May 2016
Posts: 5
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| Posted: Mon Jun 22, 2020 9:13 am Post subject: |
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It was no longer available due to the Naked Triple , which essentially made the same eliminations. Still a nice technique. I needed something similar to Clement's last two steps to solve as well.
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