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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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 Posted: Wed Mar 16, 2022 2:46 pm Post subject: Enjoy VI |
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| Code: |
+-----------------------+
| . . . | . . 3 | . . . |
| . 7 . | 2 . . | . . 4 |
| . . 4 | 8 . 7 | . . . |
|-------+-------+-------|
| . 6 8 | . 5 4 | 7 . 2 |
| . . . | 7 . 9 | . 6 . |
| 4 . 7 | 3 2 6 | . 5 8 |
|-------+-------+-------|
| . . . | 9 . . | 5 2 . |
| . . . | . 3 2 | 8 4 . |
| . 2 . | 4 . 8 | . . 7 |
+-----------------------+ |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Wed Mar 16, 2022 2:47 pm Post subject: |
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| Code: |
+------------------+--------+-----------------+
| 1259 8 1259 | 6 4 3 | 129 7 159 |
| 1369 7 1369 | 2 19 5 | 1369 8 4 |
| 123569 1359 4 | 8 19 7 | 12369 139 13569 |
+------------------+--------+-----------------+
| 39 6 8 | 1 5 4 | 7 39 2 |
| 1235 135 1235 | 7 8 9 | 4 6 13 |
| 4 19 7 | 3 2 6 | 19 5 8 |
+------------------+--------+-----------------+
| 8 4 36 | 9 7 1 | 5 2 36 |
| 7 19 169 | 5 3 2 | 8 4 169 |
| 1359 2 1359 | 4 6 8 | 139 139 7 |
+------------------+--------+-----------------+
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Play this puzzle online at the Daily Sudoku site |
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TomC
Joined: 30 Oct 2020
Posts: 359
Location: Wales
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| Posted: Fri Mar 18, 2022 9:44 am Post subject: |
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-3 r3c8 as by using the <3>'s in r4 leads to no <3> in c2
-1 r8c9 as by using <19> pair in c2 leads to no <1> in box 6
-9 r4c8 as then <19> in r3c8 and r6c7 leads to no <1> in box 9
so r4c8 is <3> to solve
I suspect there is a much simpler way than this! |
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dongrave
Joined: 06 Mar 2014
Posts: 572
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| Posted: Fri Mar 18, 2022 4:55 pm Post subject: |
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| Code: | +-----------------+----------+-----------------+
| 1259 8 1259 | 6 4 3 | 129 7 159 |
| 1369 7 139 | 2 19 5 | 1369 8 4 |
| 26 f35 4 | 8 19 7 | 26 g139 1359 |
+-----------------+----------+-----------------+
| 39 6 8 | 1 5 4 | 7 c39* 2 |
| 1235 e35 1235 | 7 8 9 | 4 6 d13 |
| 4 a19 7 | 3 2 6 |b1*9 5 8 |
+-----------------+----------+-----------------+
| 8 4 36 | 9 7 1 | 5 2 36 |
| 7 9-1 169 | 5 3 2 | 8 4 169 |
|j1359 2 j1359 | 4 6 8 |i139 h139 7 |
+-----------------+----------+-----------------+ |
I used the chain: 1r6c2=(1*-9)r6c7=(9*-3)r4c8=r5c9-r5c2=r3c2-(39*=1)r3c8-(19*=3)r9c8-(1*3=9)r9c7-(39=1|5)r9c13 => r8c2 <> 1; stte. |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Mon Mar 21, 2022 10:07 am Post subject: |
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| Good chain Dongrave. |
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dongrave
Joined: 06 Mar 2014
Posts: 572
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| Posted: Mon Mar 21, 2022 12:40 pm Post subject: |
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| Mogulmeister wrote: | | Good chain Dongrave. |
Thanks Mogulmeister! As you probably already know it's another one of my typical pencil and paper solutions!  |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Mon Mar 21, 2022 12:49 pm Post subject: |
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It is good to see all the ways that folks here work out some of these fairly gnarly puzzles. Your p+p chains are always entertaining!
This all reminds me of some of my more colourful golf shots when I went round the course with my father:
"Ah. I see you took the pretty route!"
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Mon Mar 21, 2022 12:58 pm Post subject: |
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One interesting observation I made while looking at your chain is on the <13> at d (r5c9).
If it's <1> then the puzzle solves as you've laid out - go via d then b then a and r8c2 < > 1
If instead it is <3> then r5c2 = 5 and after some helpful basics you feed into your gcd forming a <139> xy wing
and r1c9 < > 1 and again the puzzle solves. |
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