SudoCue Users
A forum for users of the SudoCue programs and the services of SudoCue.Net

Author Message
Gilbert
New kid on the Grid

Joined: 13 Jul 2006
Posts: 2
Location: NYC

 Posted: Thu Jul 13, 2006 12:45 pm    Post subject: Locked Candidates (type 2) question Dear Sudocue fans, Under "Sudoku Solving Guide", there is an example for "Locked Candidates (type 2)". Could someone please explain why box 5 can't have 7 in Column 4 or Column 6 (highlighted in red). With all the given digits shown, I somehow failed to understand this topic. Thank you in advance Gilbert_________________Gilbert
David Bryant
Gold Member

Joined: 20 Jan 2006
Posts: 86

 Posted: Thu Jul 13, 2006 5:25 pm    Post subject: "Locked candidates (type 2)" Hi, Gilbert! I'll try to explain it for you. In the example column 5 has four cells filled in, and five empty cells (r2c5, r4c5, r5c5, r6c5, and r8c5). There's a "7" at r2c3, and another "7" at r8c9. -- Clearly the "7" in column 5 cannot appear at r2c5, because of the "7" at r2c3. -- Similarly, the "7" in column 5 cannot appear at r8c5, because of the "7" at r8c9. -- Therefore the "7" in column 5 must appear at r4c5, r5c5, or r6c5. In other words, the "7" in column 5 has to lie in box 5. -- But saying that the "7" in column 5 lies in box 5 means the same thing as saying that the "7" in box 5 lies in column 5. And since the "7" in box 5 has to be in column 5, it can't possibly be in column 4 or in column 6. I hope that clears it up for you. dcb
Gilbert
New kid on the Grid

Joined: 13 Jul 2006
Posts: 2
Location: NYC

 Posted: Fri Jul 14, 2006 9:48 pm    Post subject: Hey David, I finally got it, many thanks! I think I am getting hooked with Soducue now._________________Gilbert
 Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First
 All times are GMT Page 1 of 1

 Jump to: Select a forum SudoCue - the Website----------------Daily Sudoku Nightmare & ArchiveClueless SpecialsClueless ExplosionsWeekly AssassinsTexas Jigsaw KillersSudoku LiteX-FilesDaily WindokuDaily Jigsaw SudokuSolving Guide & GlossarySamurai ContestGeneral Website Comments Sudoku - the Community----------------Help Me! I'm stuck!Solving Techniques & TipsWebsitesSoftwarePuzzlesPublicationsOff-Topic SudoCue - the Software----------------SupportWishlistCommentsReleases
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