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Jul 04 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 941
Location: Rimini, Italy
PostPosted: Sun Jul 04, 2021 12:33 pm    Post subject: Jul 04 VH Reply with quote
Hi everyone,

Code:

+--------------+--------------+----------------+
| 4    179 125 | 259  29  6   | 3    578   578 |
| 23   56  8   | 7    1   23  | 56   4     9   |
| 3569 79  35  | 3459 8   345 | 2    567   1   |
+--------------+--------------+----------------+
| 359  2   135 | 159  679 157 | 8    13567 4   |
| 35   14  6   | 125  247 8   | 9    1357  57  |
| 8    149 7   | 1359 469 135 | 156  2     56  |
+--------------+--------------+----------------+
| 1    3   9   | 246  5   247 | 467  68    268 |
| 7    8   25  | 1246 3   9   | 1456 156   256 |
| 256  56  4   | 8    27  127 | 157  1579  3   |
+--------------+--------------+----------------+

Play this puzzle online at the Daily Sudoku site

first step
XY-Wing 2,3,5 in r2c1,r38c3 and -2 in r1c3,r9c1

Code:

+-----------+---------+----------+
| 4   17 15 | 29 29 6 | 3  57 8  |
| 2   56 8  | 7  1  3 | 56 4  9  |
| 69  79 3  | 4  8  5 | 2  67 1  |
+-----------+---------+----------+
| 359 2  15 | 59 69 7 | 8  13 4  |
| 35  14 6  | 25 24 8 | 9  13 7  |
| 8   49 7  | 3  49 1 | 56 2  56 |
+-----------+---------+----------+
| 1   3  9  | 6  5  4 | 7  8  2  |
| 7   8  2  | 1  3  9 | 4  56 56 |
| 56  56 4  | 8  7  2 | 1  9  3  |
+-----------+---------+----------+

Play this puzzle online at the Daily Sudoku site

second step
XY-Wing 1,3,5 in r4c38,r5c1 and -3 in r4c1,r5c8

Ciao Gianni
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TomC



Joined: 30 Oct 2020
Posts: 358
Location: Wales
PostPosted: Sun Jul 04, 2021 12:50 pm    Post subject: Reply with quote
Nice 2 step puzzle

My second step was a very similar XY 135 giving -1 in r4c8 and r5c2


or you could have -2 in r5c4 as then r5c5=4, r5c2=1, r4c3=5, r4c4=9 and r1c4 would also be 2
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Mogulmeister



Joined: 03 May 2007
Posts: 1151
PostPosted: Sun Jul 04, 2021 4:53 pm    Post subject: Reply with quote
Either the 4 at r5c2 is true or the 4 at r6c5 is true. r4c34 are the link.

so r5c4<>4
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TomC



Joined: 30 Oct 2020
Posts: 358
Location: Wales
PostPosted: Sun Jul 04, 2021 5:33 pm    Post subject: Reply with quote
Another way to solve is to stay in box 4 c12 and use r5c8 (13)

then r4c1 <>9 as this would either give two 9's in box 4 or no 3's in box 4
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Mogulmeister



Joined: 03 May 2007
Posts: 1151
PostPosted: Mon Jul 05, 2021 9:09 am    Post subject: Reply with quote
Mogulmeister wrote:
Either the 4 at r5c2 is true or the 4 at r6c5 is true. r4c34 are the link.

so r5c4<>4


...and with a small shift from the same path above, the 9 at r6c2 is true or the 9 at r4c4 is true so r6c5<>9
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