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VH++ 021323

 
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immpy



Joined: 06 May 2017
Posts: 571

PostPosted: Mon Feb 13, 2023 5:48 pm    Post subject: VH++ 021323 Reply with quote

Hello all, enjoy the puzzle.

Code:

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

Play this puzzle online at the Daily Sudoku site

cheers...immp
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TomC



Joined: 30 Oct 2020
Posts: 356
Location: Wales

PostPosted: Tue Feb 14, 2023 9:34 am    Post subject: Reply with quote

Remove <6> from r5c5 to solve

Code:

+---------+---------------+--------------+
| 1 9 56  |  2    468 68  | 7    456 3   |
| 8 4 26  |  5    7   3   | 9    26  1   |
| 3 7 256 |  1   a46  9   | 246  8   456 |
+---------+---------------+--------------+
| 2 6 1   |  4   5    7   | 3    9   8   |
| 5 8 9   |  3   x16  2   | 146  7   46  |
| 7 3 4   | b68  9    168 | 126  256 56  |
+---------+---------------+--------------+
| 6 2 8   |  7   3    4   | 5    1   9   |
| 4 5 7   |  9   168  168 | 68   3   2   |
| 9 1 3   | c68  2    5   | 468 d46  7   |
+---------+---------------+--------------+

Play this puzzle online at the Daily Sudoku site

Quote:
The position of the <4>'s in box 3 shows that "a" and "d" cannot both be <4>

If x=6, a=4
If x=6, b<>6, c=6, d=4
This means that if x=6 there would be no <4> in box 3
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Clement



Joined: 24 Apr 2006
Posts: 1110
Location: Dar es Salaam Tanzania

PostPosted: Tue Feb 14, 2023 2:17 pm    Post subject: VH++ 021323 Reply with quote

Code:

+---------------+---------------------+--------------------+
| 1    9    56  | 2     d468      68  | 7     c456     3   |
| 8    4    26  | 5      7        3   | 9      26      1   |
| 3    7    256 | 1      46       9   | 246    8      b456 |
+---------------+---------------------+--------------------+
| 2    6    1   | 4      5        7   | 3      9       8   |
| 5    8    9   | 3      16       2   | 146    7       46  |
| 7    3    4   | 8-6    9        168 | 126    256    a56  |
+---------------+---------------------+--------------------+
| 6    2    8   | 7      3        4   | 5      1       9   |
| 4    5    7   | 9     e168      168 | 68     3       2   |
| 9    1    3   |f68     2        5   | 468    46      7   |
+---------------+---------------------+--------------------+

(6=5) - r3c9 = (5-4)r1c8 = (4-8)r1c5 = r8c5 - (8=6)r9c4 => - 6r6c4; stte
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dongrave



Joined: 06 Mar 2014
Posts: 567

PostPosted: Tue Feb 14, 2023 2:51 pm    Post subject: Reply with quote

Code:
+-------------+--------------+--------------+
| 1   9   56  |  2  e468 68  | 7   d456 3   |
| 8   4   26  |  5   7   3   | 9    26  1   |
| 3   7   256 |  1  f46  9   | 246  8   456 |
+-------------+--------------+--------------+
| 2   6   1   |  4   5   7   | 3    9   8   |
| 5   8   9   |  3   1-6 2   | 146  7   46  |
| 7   3   4   | a68  9   168 | 126  256 56  |
+-------------+--------------+--------------+
| 6   2   8   |  7   3   4   | 5    1   9   |
| 4   5   7   |  9   168 168 | 68   3   2   |
| 9   1   3   | b68  2   5   | 468 c46  7   |
+-------------+--------------+--------------+

6r6c4 = r9c4 -(6=4)r9c8 - r1c8 = r1c5 - (4=6)r3c5 => r5c5 <> 6; stte.
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glesco



Joined: 12 May 2022
Posts: 36

PostPosted: Tue Feb 14, 2023 8:06 pm    Post subject: Reply with quote

I used two steps:
An 246 xyz-wing removes 6 from r3c9.
An xy-chain with the ends at r9c8 & r3c9 removes 4 from r1c8
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