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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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 Posted: Thu Oct 21, 2021 9:09 am Post subject: VH Oct 21 |
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| Code: | +-------+-------+-------+
| 8 . 6 | 4 3 . | . . . |
| . . . | . 9 6 | . . 1 |
| 9 . . | 2 . . | . 5 . |
+-------+-------+-------+
| . . . | . . . | 6 3 5 |
| . 9 . | . 8 . | . 1 . |
| 1 6 4 | . . . | . . . |
+-------+-------+-------+
| . 2 . | . . 3 | . . 7 |
| 7 . . | 9 6 . | . . . |
| . . . | . 2 4 | 5 . 3 |
+-------+-------+-------+ |
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ZeroAssoluto
Joined: 05 Feb 2017
Posts: 941
Location: Rimini, Italy
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| Posted: Thu Oct 21, 2021 9:36 am Post subject: |
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Hi everyone,
| Code: |
+----------+--------+---------------+
| 8 5 6 | 4 3 1 | 279 279 29 |
| 34 7 2 | 5 9 6 | 348 48 1 |
| 9 34 1 | 2 7 8 | 34 5 6 |
+----------+--------+---------------+
| 2 8 7 | 1 4 9 | 6 3 5 |
| 35 9 35 | 6 8 27 | 247 1 24 |
| 1 6 4 | 3 5 27 | 2789 2789 289 |
+----------+--------+---------------+
| 45 2 59 | 8 1 3 | 49 6 7 |
| 7 34 38 | 9 6 5 | 1 248 248 |
| 6 1 89 | 7 2 4 | 5 89 3 |
+----------+--------+---------------+
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Play this puzzle online at the Daily Sudoku site
There are many solutions, here are a few
| Quote: | W-Wing
3,4 in r2c1,r3c7 SL with number 4 in r7c17 and -3 in r2c7,r3c2
3,4 in r3c7,r8c2 SL with number 4 in r7c17 and -3 in r3c2
or
XY-Wing 4,8,9 in r29c8,r7c7 and -4 in r23c7,r8c8
or Skyscraper
with number 4 in r38c2,r28c8 and -4 in r2c1,r3c7
with number 4 in r3c27,r7c17 and -4 in r2c1,r8c2
with number 4 in r27c1,r28c8 and -4 in r7c7,r8c2
or Color
color1 in r2c1,r3c7,r7c7,r8c2
color2 in r3c2,r7c1
and -4 in color1 |
Ciao Gianni |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Thu Oct 21, 2021 9:44 am Post subject: |
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A journey through basics is quite interesting.
| Code: | +--------------+--------------+----------------+
| 8 5 6 | 4 3 1 | 279 279 29 |
| 34 7 2 | 5 9 6 | 348 48 1 |
| 9 34 1 | 2 7 8 | 34 5 6 |
+--------------+--------------+----------------+
| 2 8 7 | 1 4 9 | 6 3 5 |
| 35 9 35 | 6 8 27 | 247 1 24 |
| 1 6 4 | 3 5 27 | 2789 2789 289 |
+--------------+--------------+----------------+
| 45 2 59 | 8 1 3 | 49 6 7 |
| 7 34 38 | 9 6 5 | 1 248 248 |
| 6 1 89 | 7 2 4 | 5 89 3 |
+--------------+--------------+----------------+ |
| Quote: | | R29c8, r7c7 has a <489> XY wing which means r23c7 and r8c8 <> 4 |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Thu Oct 21, 2021 9:46 am Post subject: |
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See what happens when you go away and make a coffee ?  |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Thu Oct 21, 2021 11:52 am Post subject: |
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A slightly different take:
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Thu Oct 21, 2021 12:08 pm Post subject: |
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Look at the purple cell <89> at r9c8
If it is 8 then r2c8 < > 8
If it is 9 then follow the green squares and r2c7 = 8 and again r2c8 < > 8
You can look at this as either a WXYZ wing - four numbers in four cells 3,4,8,9. That's the three green cells and the purple one.
Equally it can be viewed as an ALS xz pattern
Set A is green and contains {3,4,8,9}
Set B is purple and contains {8,9}
The restricted common is digit 9 in r7c7 and r9c8
The common candidate is digit 8 in r2c8 (red) which is eliminated because it can see both 8's in A & B. |
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