For the Sudoku crowd Eric Smith Posting Freak Posts: 2,309 Threads: 116 Joined: Jun 2005 07-01-2006, 02:08 AM Ed Look Posting Freak Posts: 801 Threads: 36 Joined: Nov 2005 07-01-2006, 06:36 PM LOL!! I've got to show this one to my kids!! Good find! Eric Smith Posting Freak Posts: 2,309 Threads: 116 Joined: Jun 2005 07-02-2006, 01:27 AM 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. Howard Owen Posting Freak Posts: 1,830 Threads: 113 Joined: Aug 2005 07-02-2006, 06:24 PM 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 Etienne Victoria Senior Member Posts: 464 Threads: 10 Joined: Jan 2005 07-02-2006, 06:42 PM 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 Dave Shaffer (Arizona) Posting Freak Posts: 776 Threads: 25 Joined: Jun 2007 07-02-2006, 07:15 PM "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). Gerson W. Barbosa Posting Freak Posts: 2,761 Threads: 100 Joined: Jul 2005 07-02-2006, 09:28 PM 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. Paul Dale Posting Freak Posts: 3,229 Threads: 42 Joined: Jul 2006 07-04-2006, 05:39 PM Come one everyone, the problem as stated is over specified. I can halve the number of solved squares and the problem is still tractable :-) ECL Member Posts: 111 Threads: 22 Joined: Jul 2007 07-05-2006, 12:39 AM 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 Massimo Gnerucci (Italy) Posting Freak Posts: 882 Threads: 23 Joined: Jan 2005 07-09-2006, 05:30 PM 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 Etienne Victoria Senior Member Posts: 464 Threads: 10 Joined: Jan 2005 07-09-2006, 06:04 PM 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. Gerson W. Barbosa Posting Freak Posts: 2,761 Threads: 100 Joined: Jul 2005 07-09-2006, 07:23 PM 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 :-) Etienne Victoria Senior Member Posts: 464 Threads: 10 Joined: Jan 2005 07-09-2006, 07:29 PM Well... I must confess I also ate pizza & gelati... Cheers. Etienne Gerson W. Barbosa Posting Freak Posts: 2,761 Threads: 100 Joined: Jul 2005 07-09-2006, 08:06 PM 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. Massimo Gnerucci (Italy) Posting Freak Posts: 882 Threads: 23 Joined: Jan 2005 07-10-2006, 04:01 AM 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 Etienne Victoria Senior Member Posts: 464 Threads: 10 Joined: Jan 2005 07-10-2006, 04:06 AM 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 Etienne Victoria Senior Member Posts: 464 Threads: 10 Joined: Jan 2005 07-10-2006, 04:09 AM 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 Frank Wales Member Posts: 117 Threads: 6 Joined: Mar 2006 07-10-2006, 06:36 AM 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. Paul Brogger Posting Freak Posts: 1,153 Threads: 94 Joined: Mar 2006 07-10-2006, 05:54 PM 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. Howard Owen Posting Freak Posts: 1,830 Threads: 113 Joined: Aug 2005 07-10-2006, 06:59 PM 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 Paul Brogger Posting Freak Posts: 1,153 Threads: 94 Joined: Mar 2006 07-10-2006, 07:15 PM 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. Frank Wales Member Posts: 117 Threads: 6 Joined: Mar 2006 07-10-2006, 08:56 PM 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. Valentin Albillo Posting Freak Posts: 1,755 Threads: 112 Joined: Jan 2005 07-11-2006, 04:11 AM Have a look at this very interesting link (includes further references): Best regards from V. « Next Oldest | Next Newest »

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