Notsomanycluespuzzle

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Notsomanycluespuzzle

Postby coloin » Sun Aug 04, 2019 9:54 pm

Code: Select all
+---+---+---+
|...|...|...|
|...|...|...|
|...|...|...|
+---+---+---+
|.35|...|9..|
|6.1|5..|...|
|...|...|...|
+---+---+---+
|...|...|.1.|
|57.|...|...|
|...|..2|..3|
+---+---+---+


Who can solve this one ?

The two clues in box 8 and 6 are significant !
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Re: Notsomanycluespuzzle

Postby Hajime » Mon Aug 05, 2019 7:18 am

11 clue vanilla Sudoku?
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Re: Notsomanycluespuzzle

Postby tarek » Mon Aug 05, 2019 9:05 am

Haven't got time to think deeply into this but in addition to looking for constraints to add, It can also be worth looking for symmetrical clues or a 10-x symmetry clue

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Re: Notsomanycluespuzzle

Postby Mathimagics » Mon Aug 05, 2019 9:27 am

If it's a valid puzzle (one solution), and it's a known variant, then that variant must involve more than just extra houses.

There are only 7 digits in the givens, so some FP or other clue-restriction variant is suggested ...

My solver suggests that it's not an NC puzzle ...
Last edited by Mathimagics on Mon Aug 05, 2019 9:39 am, edited 1 time in total.
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Re: Notsomanycluespuzzle

Postby tarek » Mon Aug 05, 2019 9:38 am

I haven't seen colin posting an NC before. He has posted many that have Special qualities.

So it could be one of those puzzles that takes advantage of a special quality in the vanilla sudoku & used it to remove clues

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Re: Notsomanycluespuzzle

Postby Mathimagics » Mon Aug 05, 2019 9:39 am

See my edit above, it's not an NC puzzle ...
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Re: Notsomanycluespuzzle

Postby Mathimagics » Mon Aug 05, 2019 9:41 am

Venezuelan beaver Sudoku? 8-)
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Re: Notsomanycluespuzzle

Postby Mathimagics » Mon Aug 05, 2019 9:48 am

Ah, how about a cricket theme?

FP with no adjacent pair adding up to 11??

I can't test it right now, as the cricket's starting!
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Re: Notsomanycluespuzzle

Postby Leren » Mon Aug 05, 2019 10:14 am

Withdrawn
Last edited by Leren on Mon Aug 05, 2019 8:31 pm, edited 5 times in total.
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Re: Notsomanycluespuzzle

Postby tarek » Mon Aug 05, 2019 11:36 am

One of the puzzle variants that colin has posted before involve having automorphic vanilla sudoku grids where boxes in different bands being equal (Stormdoku). I hope I'm not diverting away from the correct path, but I'm throwing some thoughts in here

Having said that we don't have many different clues which throws it back into FP territory

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Re: Notsomanycluespuzzle

Postby coloin » Mon Aug 05, 2019 12:15 pm

Its great that you all are taking this seriously as the cricket ensues, but its vanilla sudoku ...
So I am giving another two clues .... but we know these clues are there don't we ?
Its two easy now !

Code: Select all
+---+---+---+
|...|...|..9|
|...|...|...|
|...|...|...|
+---+---+---+
|2..|...|...|
|...|...|...|
|...|...|...|
+---+---+---+
|...|...|...|
|...|...|...|
|...|...|...|
+---+---+---+


C
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Re: Notsomanycluespuzzle

Postby tarek » Mon Aug 05, 2019 2:14 pm

So ... a row normalised grid?

Cricket not that fun today :cry:

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Re: Notsomanycluespuzzle

Postby Mathimagics » Mon Aug 05, 2019 3:29 pm

Oh, I thought it was tremendous fun! 8-)

So, a CF grid, doh !!! :?

Don't actually have a solver configured for that ...

But how many clues is in fact minimum for this "variant"? An interesting question, perhaps ...
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Re: Notsomanycluespuzzle

Postby blue » Mon Aug 05, 2019 6:05 pm

There are 55 row-minlex grids, that contain the clue set.
There are five minlex band 1's where adding 2r4c1 and the band as clues, gives a puzzle with a unique solution.
For two of those, the solution itself, is a minlex grid.

Something else is missing.

coloin wrote:The two clues in box 8 and 6 are significant !

The two band 1's, are at (1-based) indicies 24 and 29.
Since the two clues in boxes 8 and 6 are 2 and 9 (respectively), and band 29 is famous as being the only band with 2-clue puzzles,
I'll guess that the solution is:

Code: Select all
+-------+-------+-------+
| 1 2 3 | 4 5 6 | 7 8 9 |
| 4 5 6 | 7 8 9 | 2 3 1 |
| 7 8 9 | 2 3 1 | 5 6 4 |
+-------+-------+-------+
| 2 3 5 | 1 4 8 | 9 7 6 |
| 6 9 1 | 5 2 7 | 3 4 8 |
| 8 4 7 | 9 6 3 | 1 2 5 |
+-------+-------+-------+
| 3 6 2 | 8 9 5 | 4 1 7 |
| 5 7 8 | 3 1 4 | 6 9 2 |
| 9 1 4 | 6 7 2 | 8 5 3 |
+-------+-------+-------+

coloin wrote:Its two easy now !

The proposed solution grid, also has two automorphisms !
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Re: Notsomanycluespuzzle

Postby coloin » Mon Aug 05, 2019 6:12 pm

Mathimagics wrote:But how many clues is in fact minimum for this "variant"? An interesting question, perhaps ...

yes well done !!! And well explained !!

it wasnt meant to be that hard, but it was a stab at representing each minlexgrid with the minimum of data ie here it was a 53 string with 11 clues.

The clue to the band is somewhere in the 11 clues .... whatever good way you can do it !

perhaps easier is stating the band in band 1 [ as 029]
and then as few clues as possible in band 2 and 3 could be done
Code: Select all
+---+---+---+
|...|...|..9|
|...|...|...|
|...|2..|...|
+---+---+---+
|.35|...|9..|
|6.1|5..|...|
|...|...|...|
+---+---+---+
|...|...|.1.|
|57.|...|...|
|...|..2|..3|
+---+---+---+  but 13 clues


the band was coded using clues / lack of clues in these empty cells
Code: Select all
+---+---+---+
|123|456|789|
|456|789|231|
|789|231|564|
+---+---+---+
|235|148|...|
|691|527|...|
|847|963|...|
+---+---+---+
|362|...|417|
|578|...|692|
|...|...|.53|
+---+---+---+
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