For the Sudoku crowd



#13

http://xkcd.com/c74.html


#14

LOL!!

I've got to show this one to my kids!!

Good find!


#15

I'm still trying to come up with an optimal algorithm to solve it. I was going to use Alpha-Beta tree pruning, but I hear that Negascout is more efficient.


#16

I personally favor the "random drunk's walk over a cliff" algorithm to solve binary sudoku. You have to pass the output through an altitude filter to get bits out, but it's quite effective.

Regards,

Howard

#17

I just watched the World cup soccer game France vs. Brazil yesterday and got this Sudoku puzzle solved in 90 minutes (Sorry Luiz, Gerson & Nelson) :-)

Can anyone beat this ?

Etienne

Edited: 2 July 2006, 7:46 p.m. after one or more responses were posted


#18

"Can anyone beat this ?"

Assuming you are not talking about the soccer match (!), how about "unary" sudoku:

You have a single square, and you can put a zero in it (or not, if you need to think about it for a while).

#19

Quote:
(Sorry Luiz, Gerson & Nelson) :-)

Hello Etienne,

I can't speak for Luiz & Nelson. Well, win some, lose some... as you say: c'est la vie...

Best regards from Brazil,

Gerson.

#20

Quote:
I just watched the World cup soccer game France vs. Brazil yesterday and got this Sudoku puzzle solved in 90 minutes (Sorry Luiz, Gerson & Nelson) :-)

Can anyone beat this ?


Yes, we just did it! 6-4 ;-)

Sorry dear french friends...

Greetings,
Massimo


#21

Congratulations!

There is a typo in your post: we're not "french friends" but "french fries" now ;-) because we're fried...

I think Italy definitely deserved to win, both for their global performance and for this last game!!

See you in the rugby tournament next year, in South Africa in 4 years....and in this forum within the next days!

I think I have to say...Forza Italia!

Best

Etienne

Edited: 9 July 2006, 6:06 p.m.


#22

Hello Etienne,

Quote:
I think Italy definitely deserved to win, both for their global performance and for this last game!!

Well, you're a real sportsman! Chapeau!

Quote:
See you in the rugby tournament next year,

Ouch!

Quote:
I think I have to say...Forza Italia!

Well, not really... this slogan was robbed by a political party...

Greetings,
Massimo


#23

Oooops sorry!

I forgot this aspect...I thought it just meant "Powerful Italy".

Etienne

Edited: 10 July 2006, 6:46 a.m. after one or more responses were posted


#24

Bar Italia in London was festooned with 'Forza Azzuro' banners a couple of weeks ago, and they were giving out free whistles to a crowd outside in what seemed like a contest of volume with the Italian restaurant next door. Thankfully, the noise didn't spoil the taste of the coffee.

I can't imagine how loud they would have been on Sunday night, though.

#25

Ciao Massimo,

Congratulazioni Tetracampeoni!

Qui a casa mia abbiamo tutti fatto il tifo per l'Azzurra. Stasera mangieremo una bella pizza. Ne ho già ordinato una in Pizzeria Baggio. Nessuna intenzione di ricordare USA '94: Baggio è soltanto la mia pizzeria preferita :-)

Gerson

---------------

Here we have supported Squadra Azzura (sorry Les Bleus!). I've just ordered a Pizza from Baggio Pizzeria (nothing to do with the USA '94 Final: Baggio just happens to be my preferred pizzeria :-)


#26

Well... I must confess I also ate pizza & gelati...

Cheers.

Etienne


#27

Hello Etienne,

It seems you're a good sport!

Congratulations to France. Being number 2 is also nice. Congratulations to Germany and Portugal as well (Not always winning is not that bad. Losing without a fight is pretty worse...).

Best regards,

Gerson.


#28

Hello Gerson,

I love Italy! Just walking in the streets of Bologna is a delight for me.

It's a pleasure to compete friendly with the people that built such a country.

But my favorite Italian is definitely a beautiful lady - and also Hp calculator addict!

She even has her own website here.

Greetings to Brazil!

Etienne

#29

Come one everyone, the problem as stated is over specified. I can halve the number of solved squares and the problem is still tractable :-)


#30

I noticed on the 'About' page: http://xkcd.com/about.html that Randall is working at the same NASA center that I'm currently at. Perhaps I'll say hello.

On a side note, most of the fellows I work with still use HPs. Mostly 48GXs'.

ECL

#31

Has anyone put up any base-16 Sudoku?

+ - - - - + - - - - + - - - - + - - - - +
| 1 | 9 3 | 5 | E |
| 2 | | 6 | F |
| | 4 | B | D |
| 7 8 | A | C | 0 |
+ - - - - + - - - - + - - - - + - - - - +
| 9 3 | | | |
| | | | |
| A | | | |
| 4 | | | |
+ - - - - + - - - - + - - - - + - - - - +
| 5 | | | |
| B | | | |
| 6 | | | |
| C | | | |
+ - - - - + - - - - + - - - - + - - - - +
| 0 | | | |
| D | | | |
| E | | | |
| F | | | |
+ - - - - + - - - - + - - - - + - - - - +

. . . etc.


#32

Um, how do you get a sudoku when you aren't dealing with a square number of digits? Remember that '0' doesn't appear in decimal sudoku.

I guess adding 0 for hexadecimal sudoku to get a 4x4 grid would be acceptable. But being picky (and mangling the nomenclature,) wouldn't heptadecimal (or heptadekimal, or septuadecimal) be the right base for a "four-square sudoku?"

Regards,
Howard


#33

I think you just need nine symbols for a three-by-three puzzle, and they started with '1' rather than '0'.

For a four-by-four puzzle, one could use the sixteen symbols '1'-'G', or (more familiar to some programmers, at least) '0'-'F'.

I guess I'm not very picky . . .


Hey, Wikipedia has a good article, with variations. Look!


And another twist: how about three-by-three-by-three ("three cubed"?) Sudoku? (Might be hard to do on paper -- you'd need nine sheets and an ability to visualize the spatial relationships.)


Edited: 10 July 2006, 7:33 p.m.

#34

Quote:

Has anyone put up any base-16 Sudoku?


They certainly have; the Daily Mail's been doing them
for months, but they just call them "Horrific Sudoku".

Here's today's.

Many more here.

#35

Have a look at this very interesting link (includes further references):

Sudoku Variations

Best regards from V.


Possibly Related Threads…
Thread Author Replies Views Last Post
  Sudoku 50G Gilles Carpentier 6 2,224 05-13-2012, 06:32 AM
Last Post: Gilles Carpentier
  Sudoku Solver for HP-33s Marcel Samek 3 1,528 05-11-2012, 03:01 PM
Last Post: Lode
  HP-30b key assignment trick -- Sudoku helper revisited Katie Wasserman 2 1,312 09-27-2010, 11:25 AM
Last Post: Katie Wasserman
  Sudoku kc 10 3,001 09-13-2010, 10:22 PM
Last Post: David Hayden
  Two additional articles online: Minimax & Sudoku Valentin Albillo 4 1,394 07-27-2006, 04:03 AM
Last Post: Valentin Albillo
  SUDOKU GAME Fabio Albonico 5 2,074 06-15-2006, 04:03 PM
Last Post: Ed Look

Forum Jump: