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VH++ 021323

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immpy

Joined: 06 May 2017
Posts: 570

Posted: Mon Feb 13, 2023 5:48 pm Post subject: VH++ 021323

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

TomC

Joined: 30 Oct 2020
Posts: 349
Location: Wales

Posted: Tue Feb 14, 2023 9:34 am Post subject:

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

Clement

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

Posted: Tue Feb 14, 2023 2:17 pm Post subject: VH++ 021323

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

dongrave

Joined: 06 Mar 2014
Posts: 564

Posted: Tue Feb 14, 2023 2:51 pm Post subject:

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.

glesco

Joined: 12 May 2022
Posts: 35

Posted: Tue Feb 14, 2023 8:06 pm Post subject:

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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