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immpy
Joined: 06 May 2017
Posts: 574
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 Posted: Sat Jan 07, 2023 6:01 pm Post subject: VH+ 010723 |
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Hello all, enjoy the puzzle.
| Code: |
+-------+-------+-------+
| . . . | 4 . . | 8 9 . |
| 7 . . | 5 1 . | 3 . 6 |
| . . 1 | 9 . . | . . . |
+-------+-------+-------+
| 8 . 9 | 2 . . | . . . |
| . . . | 8 5 1 | . . . |
| . . . | . . 4 | 7 . 5 |
+-------+-------+-------+
| . . . | . . 5 | 1 . . |
| 5 . 7 | . 2 . | . . 9 |
| . 3 6 | . . 9 | . . . |
+-------+-------+-------+
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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: 572
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| Posted: Wed Jan 11, 2023 5:50 pm Post subject: |
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I had a tough time with this one immpy!
After basics:
| Code: | +---------------+---------------+-----------------+
| 236 26 5 | 4 367 2367 | 8 9 1 |
| 7 9 248 | 5 1 28 | 3 24 6 |
| 2346 2468 1 | 9 368 2368 | 25 2457 247 |
+---------------+---------------+-----------------+
| 8 5 9 | 2 367 367 | 46 1 34 |
| 46 7 34 | 8 5 1 | 9 236 23 |
| 126 126 23 | 36 9 4 | 7 8 5 |
+---------------+---------------+-----------------+
| 9 248 248 | 367 3468 5 | 1 23467 23478 |
| 5 148 7 | 136 2 368 | 46 346 9 |
| 124 3 6 | 17 48 9 | 25 2457 2478 |
+---------------+---------------+-----------------+
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Then I couldn't find a one-stepper so I ended up settling for 3 steps. The 1st assumed that r9c4 = 1 and hit a contradiction, the 2nd assumed that r2c3 <> 8 and hit a contradiction, and the 3rd assumed that r5c3 = 3 and also hit a contradiction. |
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immpy
Joined: 06 May 2017
Posts: 574
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| Posted: Tue Jan 17, 2023 7:50 pm Post subject: |
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Maybe this one was more of a VH++.
cheers...immp |
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dongrave
Joined: 06 Mar 2014
Posts: 572
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| Posted: Fri Jan 20, 2023 2:50 am Post subject: |
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| So that's it? No one else is going to post a solution for this one? If that's the case, then I guess this really was a VH++! (Ugh!) |
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glesco
Joined: 12 May 2022
Posts: 39
Location: North Vancouver, BC, Canada
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| Posted: Mon Jan 23, 2023 2:11 am Post subject: |
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I used a chain of 8s anchored at r2c3 & r8c2 which removes 8s from r3c2 & r7c3. The later gives an 8 at r2c3 by virtue of column 3.
That led to a contradiction of 4s in box 7. That filled out most of the puzzle.
Used an xy-wing to complete. |
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