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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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 Posted: Fri Jul 02, 2021 9:51 am Post subject: Exocet anyone ? |
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I don't know if any of you watch "Cracking the Cryptic" which is a Youtube series where a couple of top flight sudoku players solve puzzles from scratch.
This one is a bit of a beast because it throws up many candidates and introduces a new solving technique - certainly new to me at least, apparently called "Exocet". Simon Anthony is the solver and you hear him talking aloud as he works through it. The puzzle designer is called Shye.
https://youtu.be/n2No8hU2OwI
Last edited by Mogulmeister on Fri Jul 02, 2021 1:10 pm; edited 1 time in total |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Fri Jul 02, 2021 11:38 am Post subject: Grid |
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Here's the grid after basics if anyone wants to take a bite.
| Code: |
+--------------------+--------------------+----------------+
| 4 3789 1379 | 3679 37 13679 | 168 5 2 |
| 167 37 5 | 3467 8 2 | 9 14 167 |
| 16789 2 179 | 45679 47 145679 | 1468 3 167 |
+--------------------+--------------------+----------------+
| 279 3479 8 | 23457 1 3457 | 2346 249 369 |
| 5 6 1234 | 234 9 34 | 1234 7 8 |
| 1279 3479 123479 | 23478 6 3478 | 5 1249 139 |
+--------------------+--------------------+----------------+
| 2789 1 2479 | 34789 2347 34789 | 23 6 5 |
| 289 489 6 | 1 5 3489 | 7 289 39 |
| 3 5 279 | 6789 27 6789 | 12 1289 4 |
+--------------------+--------------------+----------------+
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immpy
Joined: 06 May 2017
Posts: 574
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| Posted: Fri Jul 02, 2021 4:14 pm Post subject: |
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Wow, this puzzle is insane, as I assumed it would be. There are at least 10 Discontinuous Nice Loops, and 5 Kraken Fish among various other advanced techniques. I did not attempt it, just ran it through my program to see what it might find. I stay away from these basically.
cheers...immp |
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dongrave
Joined: 06 Mar 2014
Posts: 572
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| Posted: Fri Jul 02, 2021 6:41 pm Post subject: |
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| Wow! That's a tough one! I determined that there are a couple of possible one-step solutions though because if you assume that r9c5 is a 7 it leads to a contradiction and if it's not a 7 then the puzzle gets solved - and if you assume that r8c9 is a 9 it leads to a contradiction and if it's not a 9 then it gets solved. The chains that I had to produce were pretty horrendous though! |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Sun Jul 04, 2021 6:12 am Post subject: |
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| Yes. Brutal. Either of those two will end up putting two 8's into row 8 (r8c18) but there's a lot of masochism involved! |
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Clement
Joined: 24 Apr 2006
Posts: 1113
Location: Dar es Salaam Tanzania
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| Posted: Tue Jul 06, 2021 4:40 pm Post subject: Exoct anyone |
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| Code: |
+--------------------------+-------------------------+-----------------------+
| 4 3789 S1379 | 3679 37 13679 | S168 5 2 |
| 167 37 S5 | 3467 8 2 | S9 14 167 |
| 16789 2 S179 | 45679 47 145679 | S1468 3 167 |
+--------------------------+-------------------------+-----------------------+
| 279 3479 8 | 23457 1 3457 | T234-6 249 369 |
| 5 6 1234 |B234 9 B34 | 1234 7 8 |
| 1279 3479 T234-179| 23478 6 3478 | 5 1249 139 |
+--------------------------+---------------------------------+---------------+
| 2789 1 S2479 | 34789 2347 34789 | S2-3 6 5 |
| 289 489 S6 | 1 5 3489 | S7 289 39 |
| 3 5 S279 | 6789 27 6789 | S12 1289 4 |
+--------------------------+-------------------------+-----------------------+
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An Exocet Pattern Exists
Base Cells B: (234)r5c4, (34)r5c6
Target Cells T: (123479)r6c3, (2346)r4c7
S-Cells: r123789c37
Elimination Rule 1: Any candidate in a Target Cell that is not one of the Base candidates can be removed, r4c7<>6, r6c3<>179
Elimination Rule 3: A Base candidate that is restricted to only one S cell cover house is invalid, r7c7<>3; lclste. |
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