FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in          Games  Calendar Log in to check your private messages    Error when applying "Hidden Pairs"          Sudoku Programmers Forum Index -> Solving sudoku View previous topic :: View next topic   Author Message Guepardo Joined: 14 Jan 2007 Posts: 5 : Items Posted: Sun Jan 14, 2007 4:59 pm    Post subject: Error when applying "Hidden Pairs" Hi, I found an error on rule "Hidden Quads" (http://www.angusj.com/sudoku/hints.php), this rule say: "If four candidates are restricted to four cells in a given group, then all other candidates in those four cells can be excluded." Here is the board and solution: http://new.photos.yahoo.com/guepardo_x02/album When we put numbers (blue numbers are the possible steps) based on the above rule, we found an error on 11 step! Thanks for any clues explaining this... Last edited by Guepardo on Mon Jan 15, 2007 3:04 pm; edited 1 time in total Back to top Guepardo Joined: 14 Jan 2007 Posts: 5 : Items Posted: Sun Jan 14, 2007 5:06 pm    Post subject: Sorry! I'm sharing the images in my album now! http://new.photos.yahoo.com/guepardo_x02/album If anybody can put these images in the post, that will be excellent! Last edited by Guepardo on Mon Jan 15, 2007 2:54 pm; edited 2 times in total Back to top Pat Joined: 06 Sep 2006 Posts: 128 : Items Posted: Mon Jan 15, 2007 12:04 pm    Post subject: re: Error when applying "Hidden Pairs" Guepardo wrote: Hi, I found an error on rule "Hidden Quads" ( http://www.angusj.com/sudoku/hints.php ), this rule say: "If four candidates are restricted to four cells in a given group, then all other candidates in those four cells can be excluded." Here is the board: http://us.f13.yahoofs.com/bc/441c5c6bm8961402d/bc/Sudoku/Error+01.jpg?bfv8kqFBz8AAjkT When we put numbers (blue numbers are the possible steps) based on the above rule, we found an error on 11 step! http://us.f13.yahoofs.com/bc/441c5c6bm8961402d/bc/Sudoku/Error+02.jpg?bfv8kqFB0ezGzBal And here is the solution board: http://us.f13.yahoofs.com/bc/441c5c6bm8961402d/bc/Sudoku/solution.jpg?bfORlqFBFFnt6hd Thanks for any clues explaining this... hi Guepardo, the images are not available, please start by posting the puzzle as text thanks Back to top daj95376 Joined: 05 Feb 2006 Posts: 349 : Items Posted: Mon Jan 15, 2007 5:50 pm    Post subject: Re: Error when applying "Hidden Pairs" Guepardo wrote: Hi, I found an error on rule "Hidden Quads" (http://www.angusj.com/sudoku/hints.php), this rule say: "If four candidates are restricted to four cells in a given group, then all other candidates in those four cells can be excluded." Here is the board and solution: http://new.photos.yahoo.com/guepardo_x02/album When we put numbers (blue numbers are the possible steps) based on the above rule, we found an error on 11 step! Thanks for any clues explaining this... There's no error in the rule! You don't have four candidates in only four cells. This means you don't have a Hidden Quad. Code:  *-----------------------------------------------------------*  | 3     18    5     | 4679  79    467   | 78    2     169   |  *-----------------------------------------------------------* Overlay any four candidates, and you don't get four cells. Code: candidate/cell 1   .   *   .   .   .   .   .   .   * 4   .   .   .   *   .   *   .   .   . 6   .   .   .   *   .   *   .   .   * 7   .   .   .   *   *   *   *   .   . 8   .   *   .   .   .   .   *   .   . 9   .   .   .   *   *   .   .   .   * BTW: The title for this thread doesn't match the content of your message. You need to step back and take a deep breath. Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         Sudoku Programmers Forum Index -> Solving sudoku All times are GMT Page 1 of 1   Jump to: Select a forum Sudoku----------------Solving sudokuSetting sudokuProgramming sudokuThe mathematics of sudokuExotic sudoku Library----------------PuzzlesSoftwareSudoku elsewhere Not sudoku----------------Random thoughtsForum feedback  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum   Powered by phpBB © 2001, 2005 phpBB Group Igloo Theme Version 1.0 :: Created By: Andrew Charron