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ZeroAssoluto
Joined: 05 Feb 2017
Posts: 942
Location: Rimini, Italy
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 Posted: Sun Jul 21, 2019 12:51 pm Post subject: Jul 21 VH |
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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 |
+----------+-------------+---------+
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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: 118
Location: Australia
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| Posted: Sun Jul 21, 2019 5:29 pm Post subject: |
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Using only traditional wings (and not permitting myself the UR)
I found I needed four successive xy wings! |
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