Everything about Sudoku that doesn't fit in one of the other sections
Hi Tarek,

Let me try,

Puzzle #01 :
Code: Select all
`6 . .|. . .|. . 3. . .|8 6 1|. . .. . 4|. . .|7 . .-----+-----+-----. 1 .|7 . .|. 5 .. 6 .|. 9 .|. 4 .. 9 .|. . 4|. 6 .-----+-----+-----. . 7|. . .|1 . .. . .|5 8 9|. . .5 . .|. . .|. . 9`

JPF
JPF
2017 Supporter

Posts: 3754
Joined: 06 December 2005
Location: Paris, France

Here are a few more from my collection. None of them require X-Wing, but they require lots and lots of solving steps.

Code: Select all
`Ruud #04 - 74-2354. . .|. . .|9 7 .1 5 7|. . .|. . .. 6 .|. 8 .|. . .-----+-----+-----. . 4|. . 6|. 8 1. . .|. 4 .|. . .7 3 .|2 . .|4 . .-----+-----+-----. . .|. 1 .|. 4 .. . .|. . .|2 6 5. 8 3|. . .|. . .Ruud #05 - 75-2575. . .|2 . .|. . .. . .|. 1 .|6 9 .. . 5|8 . .|4 7 .-----+-----+-----3 . .|7 . .|. 1 .9 . .|. . .|. . 3. 4 .|. . 5|. . 6-----+-----+-----. 6 1|. . 3|2 . .. 7 8|. 2 .|. . .. . .|. . 1|. . .Ruud #06 - 76-2666. . .|. 7 .|4 . .9 6 .|. . .|. . 1. . .|5 . 8|. . .-----+-----+-----1 9 .|. . .|2 . .. . 5|. 3 .|8 . .. . 7|. . .|. 1 6-----+-----+-----. . .|7 . 6|. . .4 . .|. . .|. 3 5. . 9|. 2 .|. . .`

Ruud.
Ruud

Posts: 664
Joined: 28 October 2005

Hi JPF, thanx for this nice puzzle that has also diaginal refelective summetries.

I think the puzzle is a bit harder than the standards here, it does have one of the solving techniques permitted, but it still needs (what is considered) an advanced technique by the Superior standards, I'm sure you can lower the bar a bit.......

With Ruuds latest puzzles, the total stands at 27

Tarek

tarek

Posts: 2733
Joined: 05 January 2006

Here is my solver's rating of your puzzles gsf:
Code: Select all
`gsf#01: 0gsf#02: 33gsf#03: 5gsf#04: 11gsf#05: 61gsf#06: 69gsf#07: 44gsf#08: 145gsf#09: 326gsf#10: 0gsf#11: 13gsf#12: 10gsf#13: 24gsf#14: 59gsf#15: 228`

tarek

tarek

Posts: 2733
Joined: 05 January 2006

Tarek,

responding to your reflection affection, I dug up this beauty:

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

It is not in the difficulty league of my earlier entries, but it still requires 2 X-Wings and has reflections in horizontal and vertical directions.

Ruud.
Ruud

Posts: 664
Joined: 28 October 2005

My solver's ratings of the updated puzzle list to date:
Code: Select all
`Puzzle #001 (tarek)       :217Puzzle #002 (ab)          :130Puzzle #003 (Ruud)        :565Puzzle #004 (tarek/ab)    :325Puzzle #005 (ab/tarek)    :310Puzzle #006 (ab)          :469Puzzle #007 (vidar)       :326Puzzle #008 (vidar)       :482Puzzle #009 (vidar)       :419Puzzle #010 (Ruud)        :428Puzzle #011 (Ruud)        :449Puzzle #012 (gsf)         :145Puzzle #013 (gsf)         :326Puzzle #014 (gsf)         :228Puzzle #015 (henk)        :644Puzzle #016 (henk)        :487Puzzle #017 (henk)        :326Puzzle #018 (henk)        :449Puzzle #019 (ab)          :445Puzzle #020 (ab)          :363Puzzle #021 (vidar)       :407Puzzle #022 (vidar)       :599Puzzle #023 (vidar)       :151Puzzle #024 (Red Ed)      :116Puzzle #025 (Ruud)        :366Puzzle #026 (Ruud)        :315Puzzle #027 (Ruud)        :191Puzzle #028 (Ruud)        :236`

tarek

Posts: 2733
Joined: 05 January 2006

Ruud wrote:responding to your reflection affection

Ruud wrote:responding to your reflection affection

Ruud wrote:I dug up this beauty
Indeed....

Tarek

tarek

Posts: 2733
Joined: 05 January 2006

Red Ed wrote:
Code: Select all
`......12.5........3..45.......3.15....4...2....68.9.......62..9........6.48......`
Nice thing about this is that it's automorphic: rotation by 90 degrees clockwise simply relabels the digits!:D

Code: Select all
`.....7....58..1.4...1..698.462.....................193.869..2...3.2..87....5.....`
... and another ...
Code: Select all
`.......8.98...736..7...9....51.6.......8.1.......9.83....6...2..952...16.1.......`

I'm not sure that these puzzles satisfy Tarek's requirements for superior puzzles but their symmetry is beautiful. Bundled with my solver is a program which steps through the solution to a puzzle. Running it with these puzzles is a joy:)

{ uk.geocities.com/aidan_001/software.html -- broken link }
ab

Posts: 451
Joined: 06 September 2005

Tarek you missed my x puzzle off the list. Is it not hard enough? It has the required rotational symmetry. According to my solver it needs simple box/line and an x wing. I thought you liked puzzles that required a combination of techniques!
ab

Posts: 451
Joined: 06 September 2005

I am new here and hope you will like those two puzzles.

Code: Select all
`Mage #0313+-------+-------+-------+| . . . | 7 9 5 | . . . | | . 9 . | . . . | . 2 6 | | 4 . . | . . . | . . . | +-------+-------+-------+| . . 3 | . . . | 1 . . | | . 1 . | 2 8 6 | . 5 . | | . . 5 | . . . | 7 . . | +-------+-------+-------+| . . . | . . . | . . 9 | | 8 6 . | . . . | . 4 . | | . . . | 4 1 3 | . . . | +-------+-------+-------+Mage #0321+-------+-------+-------+| . . 1 | . . 4 | 9 . . | | . . . | . . 5 | . . . | | . 6 . | . . . | 2 . 4 | +-------+-------+-------+| 8 . . | . 3 . | . . 5 | | 7 . . | . . . | . . 1 | | 5 . . | . 2 . | . . 6 | +-------+-------+-------+| 1 . 9 | . . . | . 4 . | | . . . | 7 . . | . . . | | . . 2 | 8 . . | 3 . . | +-------+-------+-------+`

EDIT : they have no singles to start

Mage
Last edited by Mage on Tue Mar 21, 2006 4:58 am, edited 1 time in total.
Mage

Posts: 17
Joined: 20 March 2006
Location: France

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

I couldn't resist posting one more. If nothing else, just to show Ruud he's not the only one who can create puzzles with no singles to start.

After the start this puzzle's easy, so it might not make the cut. Nevertheless I think you'll agree it's pretty.

This thread got me thinking, you get competitions for solvers, maybe there should be competitions for setters too. Manual setters that is. I have created a few puzzles by hand but none requires more than singles.

one other thing. I altered one of Henk's puzzles. It doesn't really add any difficulty and reduces the symmetry a bit, but I thought I'd share it with you:
Code: Select all
` . . . | . . 2 | . . . 4 . . | . 9 . | . . 1 . 5 . | 8 . 4 | . 7 .-------+-------+------ . . 3 | . . . | 2 . . . 2 1 | . . . | 3 8 . . . 7 | . . . | 5 . .-------+-------+------ . 7 . | 3 . 9 | . 5 . 9 . . | . 6 . | . . 4 . . . | 2 . . | . . .`
ab

Posts: 451
Joined: 06 September 2005

I have some harder puzzles:

Rating 4025: (4-way symmetry, 4 x-wings)
Code: Select all
` . . . | . . . | . . . . . 4 | . 8 . | 1 . . . 8 . | 6 . 7 | . 5 .-------+-------+------ 9 5 . | 2 . 8 | . 4 7 2 . . | . 6 . | . . 3 7 1 . | 4 . 3 | . 2 9-------+-------+------ . 6 . | 8 . 2 | . 3 . . . 1 | . 9 . | 4 . . . . . | . . . | . . .`

Rating 3729: (4-way symmetry, 4 x-wings)
Code: Select all
` . 2 . | . . . | . 3 . . . 7 | . 2 . | 1 . . . . 9 | 6 . 8 | 2 . .-------+-------+------ . 6 . | 7 . 5 | . 2 . . . 5 | . . . | 8 . . . 9 . | 2 . 1 | . 6 .-------+-------+------ . . 2 | 8 . 6 | 5 . . . . 1 | . 7 . | 9 . . . 5 . | . . . | . 1 .`

Rating 3509: (4-way symmetry, 3 x-wings)
Code: Select all
` . . . | . 6 . | . . . 3 . 7 | . . . | 5 . 6 . . 1 | 3 . 9 | 8 . .-------+-------+------ 7 . 5 | . . . | 1 . 8 . . . | 8 4 1 | . . . 1 . 8 | . . . | 2 . 3-------+-------+------ . . 3 | 2 . 6 | 9 . . 8 . 9 | . . . | 3 . 2 . . . | . 8 . | . . .`

Ruud:
Your rating system is very different of mine. It looks like you rate the number of steps higher then the technique. Could you explain this a little?
henk

Posts: 18
Joined: 30 December 2005

Here are two more that I found nice. Not particularly hard, but nice to look at, and the first one is also without any starting singles.

I'd number them, but I've lost count...

Code: Select all
`Puzzle #??? (vidar)+-------+-------+-------+| . . 5 | 7 . 3 | 8 . . | | . 8 . | . 9 . | . 5 . | | 9 . . | . . . | . . 6 | +-------+-------+-------+| 3 . . | 6 . 4 | . . 2 | | . 4 . | . . . | . 6 . | | 6 . . | 5 . 9 | . . 7 | +-------+-------+-------+| 7 . . | . . . | . . 4 | | . 3 . | . 4 . | . 2 . | | . . 4 | 2 . 8 | 9 . . | +-------+-------+-------+Puzzle #???+1 (vidar)+-------+-------+-------+| 9 4 . | . 8 . | . 7 2 | | 7 . . | 9 . 4 | . . 8 | | . . . | . 2 . | . . . | +-------+-------+-------+| . 9 . | . . . | . 2 . | | 6 . 7 | . . . | 4 . 1 | | . 8 . | . . . | . 6 . | +-------+-------+-------+| . . . | . 3 . | . . . | | 5 . . | 1 . 8 | . . 6 | | 1 6 . | . 4 . | . 5 9 | +-------+-------+-------+`

BTW, it could be that my solver misses something, or takes an unusual solving path, but it couldn't solve henk's 4025-rated one without an XY-Wing..

Vidar
vidarino

Posts: 295
Joined: 02 January 2006

BTW, it could be that my solver misses something, or takes an unusual solving path, but it couldn't solve henk's 4025-rated one without an XY-Wing..

It is possible! You can check it yourself using my solver:
Into Sudoku
henk

Posts: 18
Joined: 30 December 2005

henk wrote:It is possible! You can check it yourself using my solver:
Into Sudoku

Actually, I can't, since I don't (and don't plan to) run Windows. ;-) (I could try it under Wine, but I'm lazy...)

I'll take your word for it, though. It certainly wouldn't be the first time a puzzle was solved in two different ways. It might be interesting to figure out where the solvers "fork", but I don't want to clutter this thread. Here is my solver's log, if you're interested.

Vidar
vidarino

Posts: 295
Joined: 02 January 2006

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