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Exocet anyone ?

 
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Mogulmeister



Joined: 03 May 2007
Posts: 873

PostPosted: Fri Jul 02, 2021 9:51 am    Post subject: Exocet anyone ? Reply with quote

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: 873

PostPosted: Fri Jul 02, 2021 11:38 am    Post subject: Grid Reply with quote

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: 455

PostPosted: Fri Jul 02, 2021 4:14 pm    Post subject: Reply with quote

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: 443

PostPosted: Fri Jul 02, 2021 6:41 pm    Post subject: Reply with quote

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: 873

PostPosted: Sun Jul 04, 2021 6:12 am    Post subject: Reply with quote

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: 1057
Location: Dar es Salaam Tanzania

PostPosted: Tue Jul 06, 2021 4:40 pm    Post subject: Exoct anyone Reply with quote

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   |
+--------------------------+-------------------------+-----------------------+

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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