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Jul 19 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 940
Location: Rimini, Italy
PostPosted: Mon Jul 19, 2021 7:39 am    Post subject: Jul 19 VH Reply with quote
Hi everyone,

Code:

+---------+----------+----------+
| 5  2  6 | 1 489 48 | 3  89 7  |
| 48 48 3 | 7 59  2  | 6  59 1  |
| 7  9  1 | 3 58  6  | 45 2  48 |
+---------+----------+----------+
| 9  3  4 | 2 7   1  | 8  6  5  |
| 6  1  7 | 8 3   5  | 9  4  2  |
| 2  5  8 | 4 6   9  | 1  7  3  |
+---------+----------+----------+
| 48 6  5 | 9 1   7  | 2  3  48 |
| 1  7  2 | 6 48  3  | 45 58 9  |
| 3  48 9 | 5 2   48 | 7  1  6  |
+---------+----------+----------+

Play this puzzle online at the Daily Sudoku site

Quote:
Remote Pair 4,8 in r1c6,r9c6,r9c2,r7c1,r7c9,r3c9 and -8 in r1c8,r3c5
or
W-Wing
4,8 in r1c6,r8c5 SL with number 8 in r18c8 and -4 in r1c5,r9c6
4,8 in r3c9,r8c5 SL with number 4 in r38c7 and -8 in r3c5
4,8 in r7c9,r8c5 SL with number 8 in r3c59 and -4 in r8c7
5,8 in r3c5,r8c8 SL with number 5 in r2c58 and -8 in r8c5
or
XY-Wing
4,5,8 in r38c5,r8c7 and -5 in r3c7
4,5,8 in r3c57,r8c5 and -4 in r8c7
or
Skyscraper
with number 8 in r3c59,r8c58 and -8 in r1c8,r7c9
with number 8 in r19c6,r18c8 and -8 in r8c5
or
BUG+1 in r1c5 and r1c5=8
or
2 String Kite
with number 8 in r19c6,r8c58 and -8 in r1c8
with number 8 in r8c58,r37c9 and -8 in r3c5
with number 8 in r3c59,r18c8 and -8 in r8c5


Ciao Gianni
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TomC



Joined: 30 Oct 2020
Posts: 358
Location: Wales
PostPosted: Mon Jul 19, 2021 8:23 am    Post subject: Reply with quote
r1c6<>8 as by using the 8's in boxes 8 and 9 you get no 8's in box 3
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Mogulmeister



Joined: 03 May 2007
Posts: 1151
PostPosted: Mon Jul 19, 2021 9:58 am    Post subject: Reply with quote
Forgive me if this is not a VH technique - although I don't see why not.

Colouring. More than just a therapy.

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Mogulmeister



Joined: 03 May 2007
Posts: 1151
PostPosted: Mon Jul 19, 2021 10:04 am    Post subject: Reply with quote
Choose two colours (green and pink). We are following the 8's.

Start with green on r8c5 and follow the strong link and use the other colour, pink
on r8c7. Back to green on r7c9 and so on - alternating colours.

Look at the landscape and you can see instances where two colours are in the same house (row, column, box). Row 1 has two greens and so does column 5. These are contradictions.

If they were TRUE they couldn't exist so they must be FALSE. You can remove 8 from every green square.
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Earl



Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
PostPosted: Mon Jul 19, 2021 11:25 am    Post subject: Jul 19 VH Reply with quote
Finned Xwing 8's C58 (R3C5 is the fin 8)
R1C6 -8 if R3C5 is either 8 or 4.

Early Earl
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