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Smorgasbord Advanced 032320

 
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immpy



Joined: 06 May 2017
Posts: 455

PostPosted: Mon Mar 23, 2020 1:56 pm    Post subject: Smorgasbord Advanced 032320 Reply with quote

Hello all,
Seemed like this puzzle had one of everything. Took me several steps to solve. I am thinking others here might be able to shorten the process. I could not do it, and became impatient trying to. Enjoy, stay healthy and well...

Code:

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

Play this puzzle online at the Daily Sudoku site

cheers...immp
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Mogulmeister



Joined: 03 May 2007
Posts: 888

PostPosted: Sun Jun 27, 2021 10:55 am    Post subject: Reply with quote

This is a tasty smorgasbord indeed Immp. There didn't seem to be any replies and more than 4,500 views! As you say, with lots of chipping away you can get to a solution or possibly a good one for the big chain although I haven't found one yet. Here’s my three hopper.

Code:
+---------------+----------------+--------------+
| 7   358  135  | 158  9   6     | 4   58  2    |
| 256 2568 4    | 7    3   258   | 568 9   1    |
| 9   2568 15   | 4    125 1258  | 568 7   3    |
+---------------+----------------+--------------+
| 4   7    2    | 9    156 15    | 3   56  8    |
| 56  1    9    | 3    8   4     | 25  256 7    |
| 8   356  35   | 25   256 7     | 1   4   9    |
+---------------+----------------+--------------+
| 25  9    7    | 1258 4   3     | 28  128 6    |
| 3   4    6    | 128  7   128   | 9   128 5    |
| 1   25   8    | 6    25  9     | 7   3   4    |
+---------------+----------------+--------------+


After basics.


Then for my first go round

1)There's a loop that shows 2 can't exist at r6c5 plug 2 in and it eliminates itself (2-56)r6c5=5(r6c4)-r6c23=r5c1-r7c1=r9c2-(5=2)r9c5 ==> r6c5<>2 and therefore r6c4 must = 2

Then

2)r7c7 must be 8 because (2=5)r7c1-r9c2-(2=5)r9c5-(5=18)r78c4-(18=5)r1c4-(5=8)r1c8-(8=12)r78c78=(8-2)r7c7
In plain English means that whether you start with 2 or 5 in r7c1, r7c7 is always 8

Basics!! A triple turns up in box 1 so eliminate surplus 5's

3)Simple 15, 12, 25 XY wing at r48c6 and r9c5 that eliminates the 5s at r46c5

A good candidate for fewer steps.

Good puzzle Immp.
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dongrave



Joined: 06 Mar 2014
Posts: 446

PostPosted: Sun Jun 27, 2021 5:02 pm    Post subject: Reply with quote

Using Mogulmeister's grid I used the following chain:

5r7c4-(5=2*)r9c5-[(2=5*)r9c2 -r8c46]=r8c8-(2=5|6)r45c8-(5=8*)r1c8-(5*8=3)r1c2-(35*=6)r6c2-(2*6=5)r6c5-(2*5=1)r3c5-(18*=5)r1c4 contradiction (i.e. 5r17c4) => r7c4 <> 5; stte.

(Whew!)
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Mogulmeister



Joined: 03 May 2007
Posts: 888

PostPosted: Tue Jun 29, 2021 12:31 pm    Post subject: Reply with quote

Very good dongrave.

I ran out of time but sensed that the heat might come from box 8.
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dongrave



Joined: 06 Mar 2014
Posts: 446

PostPosted: Tue Jun 29, 2021 1:31 pm    Post subject: Reply with quote

Mogulmeister wrote:
Very good dongrave.

I ran out of time but sensed that the heat might come from box 8.


Thanks a lot Mogulmeister! I have more time than I used to (thanks to the pandemic).
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Mogulmeister



Joined: 03 May 2007
Posts: 888

PostPosted: Tue Jun 29, 2021 2:27 pm    Post subject: Reply with quote

It is perhaps counterintuitive, but I can see some of the more traditional "pencil and paper' solvers being able to do this. You'd maybe need a photocopier/scanner.
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dongrave



Joined: 06 Mar 2014
Posts: 446

PostPosted: Thu Jul 01, 2021 12:45 pm    Post subject: Reply with quote

Mogulmeister wrote:
It is perhaps counterintuitive, but I can see some of the more traditional "pencil and paper' solvers being able to do this. You'd maybe need a photocopier/scanner.


Interesting point Mogulmeister! I only use pencil and paper (and of course an eraser!) A few years ago I used a photocopier/scanner but then I improved my pencil marking system so now it's no longer necessary. One problem with special pencil marks though is that you can't use them in software because they don't provide that kind of flexibility.
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Mogulmeister



Joined: 03 May 2007
Posts: 888

PostPosted: Thu Jul 01, 2021 1:43 pm    Post subject: Reply with quote

Keith (and Marty) would be delighted I'm absolutely sure!
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