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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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 Posted: Fri Dec 03, 2021 9:05 am Post subject: VH 3rd December |
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| Code: |
+-------+-------+-------+
| . 3 5 | . 9 . | . 2 . |
| . . . | . . 1 | 3 5 . |
| 2 . . | . . 6 | 4 . 7 |
+-------+-------+-------+
| . . . | . . . | . 3 9 |
| . . 6 | . 4 . | 2 . . |
| 3 5 . | . . . | . . . |
+-------+-------+-------+
| 7 . 3 | 1 . . | . . 2 |
| . 6 1 | 2 . . | . . . |
| . 9 . | . 6 . | 7 8 . |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Fri Dec 03, 2021 9:08 am Post subject: |
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After basics
| Code: | +--------------+-----------------+--------------+
| 46 3 5 | 478 9 478 | 1 2 68 |
| 469 47 479 | 48 2 1 | 3 5 68 |
| 2 1 8 | 5 3 6 | 4 9 7 |
+--------------+-----------------+--------------+
| 148 2 47 | 678 1578 578 | 68 3 9 |
| 189 78 6 | 3789 4 378 | 2 17 5 |
| 3 5 79 | 6789 178 2 | 68 17 4 |
+--------------+-----------------+--------------+
| 7 48 3 | 1 58 4589 | 59 6 2 |
| 58 6 1 | 2 578 5789 | 59 4 3 |
| 45 9 2 | 34 6 345 | 7 8 1 |
+--------------+-----------------+--------------+ |
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ZeroAssoluto
Joined: 05 Feb 2017
Posts: 942
Location: Rimini, Italy
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| Posted: Fri Dec 03, 2021 10:16 am Post subject: |
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Hi everyone,
first step W-Wing 5,8 in r7c5,r8c1 SL with number 5 in r9c16 and -8 in r7c2,r8c56
and XY-Wing 1,7,9 in r5c18,r6c3 and -7 in r6c8
Ciao Gianni |
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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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| Posted: Fri Dec 03, 2021 12:43 pm Post subject: Dec 03 VH |
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(Correction)
My first step before the 179 xywing was:
458xywing@R7C2, -5R9C6
Early Earl
Last edited by Earl on Fri Dec 03, 2021 4:10 pm; edited 2 times in total |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Fri Dec 03, 2021 12:49 pm Post subject: |
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| Hi Earl - good spot. |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Fri Dec 03, 2021 4:35 pm Post subject: |
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Another way to look at this is to see that we have an almost XY wing - the killer <179> as used above.
However, at the start that is spoiled by the extra 8 in r5c1.
| Code: | Either the 8 at r5c1 is true or the <179> XY Wing is true.
Let's look at making that 8.
r5c1 = 8 then r8c1 = 5 r9c1 = 4 and r7c2 = 8
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\ /
\ /
\/
r9c4=3 and r9c6 = 5 and r7c5 = 8
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Two 8's in row 7 - contradiction so we know that r5c1 can NOT be 8
The XY Wing <179> is true and puzzle solved. |
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