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Extreme 010421

 
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immpy



Joined: 06 May 2017
Posts: 378

PostPosted: Mon Jan 04, 2021 6:40 pm    Post subject: Extreme 010421 Reply with quote

Hello all, enjoy the puzzle. Thinking one step would not be enough here. But I have been wrong before...

Code:

+-------+-------+-------+
| . . 5 | . . . | . . . |
| . . 6 | . 5 . | . 1 . |
| . 9 7 | 2 . 3 | . . . |
+-------+-------+-------+
| . 6 . | . . . | 1 2 . |
| . . 2 | 3 . 6 | 9 . . |
| . 8 3 | . . . | . 6 . |
+-------+-------+-------+
| . . . | 9 . 8 | 2 3 . |
| . 5 . | . 1 . | 4 . . |
| . . . | . . . | 8 . . |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site

cheers...immp
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TomC



Joined: 30 Oct 2020
Posts: 30
Location: Wales

PostPosted: Thu Jan 07, 2021 4:02 pm    Post subject: Reply with quote

Code:

+-------------+---------------+-----------+
| 248  234 5  | 16  679  179  | 37 48 29  |
| 248  234 6  | 48  5    79   | 37 1  29  |
| 1    9   7  | 2   48   3    | 6  5  48  |
+-------------+---------------+-----------+
| 479  6   49 | 458 4789 4579 | 1  2  3   |
| 5    1   2  | 3   478  6    | 9  48 478 |
| 479  8   3  | 14  2    1479 | 5  6  47  |
+-------------+---------------+-----------+
| 46   7   1  | 9   46   8    | 2  3  5   |
| 3    5   8  | 7   1    2    | 4  9  6   |
| 2469 24  49 | 456 3    45   | 8  7  1   |
+-------------+---------------+-----------+

Play this puzzle online at the Daily Sudoku site

After basics eliminate the 6 in r9c4 because then r7c5 = 4 and r6c4 = 4 so no 4's in box 2

Then gets you to

Code:

+---------+------------+-----------+
| 28 34 5 | 6  79  1   | 37 48 29  |
| 28 34 6 | 48 5   79  | 37 1  29  |
| 1  9  7 | 2  48  3   | 6  5  48  |
+---------+------------+-----------+
| 79 6  4 | 58 789 579 | 1  2  3   |
| 5  1  2 | 3  478 6   | 9  48 478 |
| 79 8  3 | 1  2   479 | 5  6  47  |
+---------+------------+-----------+
| 4  7  1 | 9  6   8   | 2  3  5   |
| 3  5  8 | 7  1   2   | 4  9  6   |
| 6  2  9 | 45 3   45  | 8  7  1   |
+---------+------------+-----------+

Play this puzzle online at the Daily Sudoku site

eliminate 4 from r5c5 using pair of 48's in r3 - no 4's in box 6

Tom
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dongrave



Joined: 06 Mar 2014
Posts: 403

PostPosted: Thu Jan 07, 2021 6:38 pm    Post subject: Reply with quote

Note that you can remove the 8 from r5c5 of Tom's initial grid due to the locked candidates in box 6. (Warning: The following solution is not pretty!)

4r3c9 - [(4=7*)r6c9 -r3c5] = 4*r2c4 - (4=1*)r6c4 - (1=6)r1c4 - (4*6=5)r9c4 - (5=4)r9c6 - (1*47*=9)r6c6 - (7*9=4)r6c1 - r4c3 = r9c3 contradiction (i.e. 4r9c36) => r3c9 <> 4; stte.
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immpy



Joined: 06 May 2017
Posts: 378

PostPosted: Fri Jan 08, 2021 8:20 pm    Post subject: Reply with quote

Heh heh, lots of stuff in this one. Even spotted a pair of Jellyfish, one finned and one regular. Can be bypassed of course.

cheers...immp
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