FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in          Games  Calendar Log in to check your private messages    Solving wapati's grids by guessing Goto page Previous  1, 2, 3          Sudoku Programmers Forum Index -> Puzzles View previous topic :: View next topic   Author Message hobiwan Joined: 11 Feb 2008 Posts: 83 : Items Posted: Tue Feb 12, 2008 6:51 pm    Post subject: Frank wrote: 1.. My browser FireFox 2.0.0.12 has a strange behaviour when it is activated under Linux/Ubuntu 7.10: columns are not vertically aligned, as shown below, while no problems arise under Windows-Xp. I don't have your configuration available, but from your picture it seems as if there was a problem with the font (digits are slightly wider than the rest). You should try another font. Back to top Frank Joined: 24 Jan 2008 Posts: 29 : Location: Italy Items Posted: Wed Feb 13, 2008 6:58 am    Post subject: Thanks hobiwan I've just ended to try the following combinations: serif 16 sanserif 16 FreeMono 16 BitStream Vera Sans 16 and 20 and refreshing the page. No alignment appeared. Unfortunately, Ubuntu fonts don't include equally spaced characters, like Courier or Courier New. Thanks again. Back to top Frank Joined: 24 Jan 2008 Posts: 29 : Location: Italy Items Posted: Wed Feb 13, 2008 9:43 am    Post subject: Trial $ Error grid in only two shots !! Is it nice? See the solution here: http://img29.picoodle.com/img/img29/4/2/13/f_1615215m_49ea2f0.jpg Code: # # Source: Puzzle Designer of `The Su Doku Assistant`(v1.9) #         seed 1615, 21 starting cells, 5 grade of difficulty #         symmetric grid #         (max.grade of diff.=6, often not for human minds!) # 8 . .|. . .|. . 3 . 6 .|. 5 .|. 4 . . . .|2 . 9|. . . -----+-----+----- . . 1|. . .|9 . . . 2 .|. 4 .|. 6 . . . 5|. . .|7 . . -----+-----+----- . . .|5 . 1|. . . . 4 .|. 6 .|. 2 . 3 . .|. . .|. . 8 # #    ----- 1st Tree ----- #    3B3 (alias 3E3) #     | #     +-- 2G1 (alias 2B1) (mark ^) #         which reaches the target # Back to top Frank Joined: 24 Jan 2008 Posts: 29 : Location: Italy Items Posted: Sun Feb 17, 2008 9:04 pm    Post subject: A long discussion has been carried out here: http://www.sudoku.org.uk/SudokuThread.asp?fid=4&sid=10069&p1=1&p2=10 It concerns the so-called extreme #71 grid Here is my solution, reached in 4 nodes: http://img37.picoodle.com/img/img37/4/2/17/f_extreme71m_974957e.jpg Code: 2 . .|1 . 9|4 . . . 8 .|. . 3|. . . . . 7|. 8 .|. . . -----+-----+----- 9 2 .|5 . .|. . . 6 . .|. . .|. . 1 . . .|. . 4|. 2 5 -----+-----+----- . . .|. 2 .|8 . . . . .|9 . .|. 7 . . . 8|4 . 1|. . 3 # #    ----- 1st Tree ----- #    5G6 (alias 5C6) [contradiction] #    5C6 definitive  (circled) # #    ----- 2nd Tree ----- #    7G6 (alias 7D6) #     | #     +-- 3H5 (alias 3E5) (mark ^) [contradiction] #     +-- 3E5 (mark o) #          | #          +-- 3C7 (alias 3D7) (mark ~) [contradiction] #          +-- 3D7 (squared mark) #               | #               +-- 3F3 (alias 3A3) (mark //) [contradiction] #               +-- 3A3 which solves the puzzle # Back to top gsf Joined: 18 Aug 2005 Posts: 411 : Location: NJ USA Items Posted: Sun Feb 17, 2008 9:34 pm    Post subject: Code: #    ----- 1st Tree ----- #    5G6 (alias 5C6) [contradiction] #    5C6 definitive  (circled) where is the description of how you decided on { 5G6 5C6 } as the first move? Back to top Frank Joined: 24 Jan 2008 Posts: 29 : Location: Italy Items Posted: Mon Feb 18, 2008 7:47 am    Post subject: gsf wrote: [code] where is the description of how you decided on { 5G6 5C6 } as the first move? Simply in column 6, after logic moves: C6 -> 56 D6 -> 67 G6 -> 567 At the failure of 5G6, 5C6 becomes valid and it has been circled in order to be distinguished from logical numbers (top-left angles). Bye, Frank Back to top Frank Joined: 24 Jan 2008 Posts: 29 : Location: Italy Items Posted: Wed Feb 20, 2008 3:58 pm    Post subject: Grid #12 from Glenn Fowler's huge database (sudoku section): FNBTXYW-1-constrained puzzle sample (100000) URL: http://www.research.att.com/~gsf/ Code: # # 81-digit line #12 # 1......89..67....3....2....2......983..81..6.....4..17..8....3.6.15...4.94.6..... # My solution is shown below and takes only one shot: 1C4 (alias 1G4), being in the same column 4: C4->19; F4->29; G4->129 http://img37.picoodle.com/img/img37/4/2/20/f_glenn12m_84e2090.jpg Back to top north55 Joined: 02 Dec 2006 Posts: 43 : Items Posted: Fri Feb 22, 2008 4:04 am    Post subject: Frank, if my roof leaks, if my car won't start, if my back hurts so much I cannot stand up.... I would never get a "guessor". If you would, well, goodbye. Back to top Frank Joined: 24 Jan 2008 Posts: 29 : Location: Italy Items Posted: Fri Feb 22, 2008 5:25 am    Post subject: north55 wrote: Frank, if my roof leaks, if my car won't start, if my back hurts so much I cannot stand up.... I would never get a "guessor". If you would, well, goodbye. Good luck Back to top Frank Joined: 24 Jan 2008 Posts: 29 : Location: Italy Items Posted: Sat Feb 23, 2008 6:46 am    Post subject: Code:           +--------------------------------------------------+           |            L  A  S  T     G R I D                |           |                                                  |           |  (one month of sudoku divertissment is enough!)  |           |                                                  |           +--------------------------------------------------+ The proposed puzzle is typical for understanding the main difference beetween brute force method and guess, as applied by me! In fact, the choice of the initial value has the same importance of what happens in numerical analysis on dealing with Newton-Raphson iteration, in order to find the convergence to one root. Probably, this grid is evaluated (through computer programs) as diabolic, nightmare, insane. Really, the appropriate choice of the initial guess goes to the target in only one shot, as shown here: http://img26.picoodle.com/img/img26/4/2/22/f_2333215fm_88b6160.jpg Code: # Source: Puzzle Designer of `The Su Doku Assistant`(v2.08) #         seed 2333, 21 starting cells, 5 grade of difficulty #         symmetric grid (max.grade of diff.=6) . . .|7 6 4|. . . . 2 .|. 9 .|. 4 . . . .|. . .|. . . -----+-----+----- . . 8|. . .|7 . . . 4 7|. 2 .|6 5 . . . 1|. . .|8 . . -----+-----+----- . . .|. . .|. . . . 3 .|. 5 .|. 2 . . . .|6 7 1|. . . #         8G5 (alias 8C5) solves the puzzle            # For private contacts, please see my email address in one of my previous posts. Best wishes, Frank Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         Sudoku Programmers Forum Index -> Puzzles All times are GMT Goto page Previous  1, 2, 3 Page 3 of 3   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