The New Sudoku Players' Forum

[JPF]

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

[Ruud]

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.

[tarek]

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]

Here is my solver's rating of your puzzles gsf:

Code: Select all

gsf#01: 0
gsf#02: 33
gsf#03: 5
gsf#04: 11
gsf#05: 61
gsf#06: 69
gsf#07: 44
gsf#08: 145
gsf#09: 326
gsf#10: 0
gsf#11: 13
gsf#12: 10
gsf#13: 24
gsf#14: 59
gsf#15: 228

tarek

[Ruud]

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.

[tarek]

My solver's ratings of the updated puzzle list to date:

Code: Select all

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


[tarek]

responding to your reflection affection

responding to your reflection affection

I dug up this beauty

Indeed....

Tarek

[ab]

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]

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!

[Mage]

Nice thread.

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

[ab]

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 . . | . . .


[henk]

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?

[vidarino]

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

[henk]

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

[vidarino]

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