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immpy
Joined: 06 May 2017
Posts: 571
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 Posted: Fri Mar 11, 2022 7:49 pm Post subject: VH+ 031122 |
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Hello all, enjoy the puzzle.
| Code: |
+-------+-------+-------+
| 1 5 . | . 3 . | . 8 2 |
| 9 . . | . 7 . | . . 3 |
| . . . | 1 . 5 | . . . |
+-------+-------+-------+
| . . 9 | . . . | 6 . . |
| 5 8 . | . . . | . 7 1 |
| . . 4 | . . . | 5 . . |
+-------+-------+-------+
| . . . | 3 . 6 | . . . |
| 6 . . | . 2 . | . . 5 |
| 8 9 . | . 1 4 | . 6 7 |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site
cheers...immp |
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dongrave
Joined: 06 Mar 2014
Posts: 568
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| Posted: Sun Mar 13, 2022 1:13 am Post subject: |
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Thanks for the puzzle immp! I enjoyed that! As usual, I used pencil and and paper to solve it - and ended up with a crazy chain (as usual).
After basics:
| Code: | +------------------+------------------+----------------+
| 1 5 e67 | 46 3 9 |f47 8 2 |
| 9 d46 m68 | 2468 7 L28 | 1 5 3 |
| 234 234 2378 | 1 48 5 | 479 g49 6 |
+------------------+------------------+----------------+
| 237 1237 9 | 2478 5 12378 | 6 i234 48 |
| 5 8 236 | 249 469 k23 |j349 7 1 |
| 237 12367 4 | 2789 689 12378 | 5 i239 89 |
+------------------+------------------+----------------+
|b247 b247 5 | 3 89 6 | 2489 1 a4*9 |
| 6 c34 1 | 789 2 78 | 3489 h349 5 |
| 8 9 23 | 5 1 4 | 23 6 7 |
+------------------+------------------+----------------+ |
4*r7c9-r7c12=r8c2-(4=6)r2c2-(6=7)r1c3-(7=4)r1c7-(4=9)r3c8-(4*9=3)r8c8-r46c8=r5c7-(3=2)r5c6-(2=8)r2c6-(8=6)r2c3 contradiction (i.e. 6r2c23) => r7c9 <> 4; stte.
Last edited by dongrave on Sun Mar 13, 2022 5:44 pm; edited 1 time in total |
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TomC
Joined: 30 Oct 2020
Posts: 358
Location: Wales
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| Posted: Sun Mar 13, 2022 8:41 am Post subject: |
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After basics, I used a skyscraper on <4> in rows 1 and 4 to give -4 in r5c7
This got me to here
| Code: |
+-----------------+----------------+-------------+
| 1 5 67 | 46 3 9 | 47 8 2 |
| 9 46 68 | 2468 7 28g | 1 5 3 |
| 2347 2347 2378 | 1 4-8 5 | 479 49 6 |
+-----------------+----------------+-------------+
| 237 1237 9 | 2478 5 12378 | 6 234 48c |
| 5 8 236 | 249 469 23f | 39e 7 1 |
| 237 12367 4 | 2789 689 12378 | 5 239 89d |
+-----------------+----------------+-------------+
| 247 247 5 | 3 89a 6 | 2489 1 49b |
| 6 34 1 | 789 2 78 | 3489 349 5 |
| 8 9 23 | 5 1 4 | 23 6 7 |
+-----------------+----------------+-------------+
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An XY chain a-g gives pincers on <8> in a + g leads to -8 r3c5 to solve |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Mon Mar 14, 2022 10:46 am Post subject: |
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Overlapping ALS xz
Set A (green) {2,4,7,8,9} + yellow square
Set B (yellow) {4,9}
Restricted common is 4
Common candidate (red) is 9 and is eliminated as it is seen by green and yellow.
This then solves. |
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Clement
Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
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| Posted: Wed Mar 16, 2022 3:33 pm Post subject: |
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Two Steps | Code: |
+------------------------+------------------------+---------------------+
| 1 5 67 | 46 3 9 | 47 8 2 |
| 9 46 68 | 2468 7 28 | 1 5 3 |
|a234 23-4 2378 | 1 h48 5 | 79-4 9-4 6 |
+------------------------+------------------------+---------------------+
| 237 1237 9 | 2478 5 12378 | 6 234 48 |
| 5 8 236 | 2469 469 23 | 349 7 1 |
| 237 12367 4 | 2789 689 12378 | 5 239 89 |
+------------------------+------------------------+---------------------+
|b247 247 5 | 3 g89 6 |f2489 1 49 |
| 6 c34 1 | 789 2 78 | 3489 349 5 |
| 8 9 d23 | 5 1 4 |e23 6 7 |
+------------------------+------------------------+---------------------+
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Step 1: (4)r3c1 = r7c1 – (4=3)r8c2 – (3=2)r9c3 – r9c7 = (2-8)r7c7 = r7c5 – (8=4)r3c5 => - 4r3c278
| Code: |
+-------------------------+--------------------------+----------------------+
| 1 5 7 | 6 3 9 | 4 8 2 |
| 9 a46 a68 | 248 7 a28 | 1 5 3 |
| 234 234 238 | 1 48 5 | 7 9 6 |
+-------------------------+--------------------------+----------------------+
| 237 1237 9 | 278 5 12378 | 6 234 48 |
| 5 8 236 | 249 469 b23 |c39 7 1 |
| 237 12367 4 | 2789 689 12378 | 5 23 89 |
+-------------------------+--------------------------+----------------------+
| 247 247 5 | 3 89 6 | 289 1 49 |
| 6 3-4 1 | 789 2 78 | 89 e34 5 |
| 8 9 23 | 5 1 4 |d23 6 7 |
+-------------------------+--------------------------+----------------------+
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Step 2: (4=682)r2c236 – (2=3)r5c6 – r5c7 = r9c7 – (3=4)r8c8 => - 4r8c2; stte |
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