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Jul 21 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 394
Location: Rimini, Italy

PostPosted: Sun Jul 21, 2019 12:51 pm    Post subject: Jul 21 VH Reply with quote

Hi everyone,

Code:

+----------+-------------+---------+
| 8  6   4 | 9   7   3   | 2 5  1  |
| 25 15  7 | 148 128 6   | 9 48 3  |
| 29 19  3 | 148 5   24  | 6 48 7  |
+----------+-------------+---------+
| 6  2   8 | 45  3   45  | 7 1  9  |
| 7  4   5 | 2   9   1   | 3 6  8  |
| 1  3   9 | 7   6   8   | 5 2  4  |
+----------+-------------+---------+
| 59 7   1 | 6   4   259 | 8 3  25 |
| 4  589 6 | 3   28  259 | 1 7  25 |
| 3  58  2 | 158 18  7   | 4 9  6  |
+----------+-------------+---------+

Play this puzzle online at the Daily Sudoku site

one-step solution:
AIC
if r2c2=1 and -1 in r2c45,r3c2
if r2c2=5 r2c1=2 r8c5=2 r8c2=8 r3c2=9 r3c4=1 and -1 in r2c45,r3c2

possible solution with multiple steps:
UR 4,8 in r23c48 and -1 in r2c5,r9c4
and
XY-Wing 2,4,8 in r2c58,r3c6 and -4 in r2c4,r3c8
and
XY-Wing 1,5,8 in r2c24,r9c2 and -8 in r9c4

Ciao Gianni
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RobertRattley



Joined: 24 Jun 2007
Posts: 106
Location: Australia

PostPosted: Sun Jul 21, 2019 5:29 pm    Post subject: Reply with quote

Using only traditional wings (and not permitting myself the UR)
I found I needed four successive xy wings!
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