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 07-10-2011, 09:33 PM #1 youtalkfunny dumbest smart person his mom knows     Join Date: Oct 2002 Location: I can't believe it, either! Posts: 20,676 Stuck on a Sudoku: what's the next move? I took a 50/50 guess on one, and it worked, but that's not how you're supposed to do these things. TIA. Last edited by youtalkfunny; 07-10-2011 at 10:01 PM.
 07-10-2011, 09:51 PM #2 Aicirt Pooh-Bah     Join Date: Sep 2004 Posts: 5,017 Re: Stuck on a Sudoku: what's the next move? Don't have a move yet, but just thinking out loud: Spoiler: You know the 6 in the top right corner must be in the bottom row of that 3x3 square. You know this because the 6 in the upper left must come from the top two rows and the six from the upper middle square must be in the top two rows. I feel like I'm explaining that really badly, but hopefully that makes sense.
 07-10-2011, 09:57 PM #3 youtalkfunny dumbest smart person his mom knows     Join Date: Oct 2002 Location: I can't believe it, either! Posts: 20,676 Re: Stuck on a Sudoku: what's the next move? that's the hard way to say it. the easy way is, "In the third row, the first available open space can't be a 6, as that column already has a 6, so the six must go in one of the other two available spaces" EDIT: oh wait, i see, erase the other tiny 6's in the 3x3 EDIT: Edited pic, Took out the tiny other 6's in upper right 3x3
 07-10-2011, 10:01 PM #4 Aicirt Pooh-Bah     Join Date: Sep 2004 Posts: 5,017 Re: Stuck on a Sudoku: what's the next move? Yeah that is a better way of stating it :P. And yes that is the conclusion I was hinting at and didn't explicitly state, lol.
 07-10-2011, 10:14 PM #5 bobman0330 Carpal \'Tunnel     Join Date: Aug 2004 Posts: 23,161 Re: Stuck on a Sudoku: what's the next move? Spoiler: r5c3, r6c3, and r9c3 are the only cells in c3 that can be either 1, 3, or 7. Therefore, they cannot be anything other than 1, 3, or 7. That means that the only remaining cell in the bottom left that can be 5 is r8c3.
 07-10-2011, 10:21 PM #6 Aicirt Pooh-Bah     Join Date: Sep 2004 Posts: 5,017 Re: Stuck on a Sudoku: what's the next move? Yep! Nice one, bob.
 07-10-2011, 10:24 PM #7 youtalkfunny dumbest smart person his mom knows     Join Date: Oct 2002 Location: I can't believe it, either! Posts: 20,676 Re: Stuck on a Sudoku: what's the next move? Wow, never would have found that. Nice call, BM EDIT TO ADD: Confirm that after bob's secret step, the puzzle solves itself. Last edited by youtalkfunny; 07-10-2011 at 10:32 PM.
 07-11-2011, 12:01 AM #8 WinEvryRacex Carpal \'Tunnel     Join Date: Nov 2007 Location: Gone Posts: 12,923 Re: Stuck on a Sudoku: what's the next move? lock?
 07-11-2011, 01:43 AM #9 kioshk Nixonian     Join Date: Oct 2006 Location: now Watergate does not bother me Posts: 90,163 Re: Stuck on a Sudoku: what's the next move? I got so addicted to sudoku last year, literally doing about 20 a day.
 07-11-2011, 02:15 AM #10 housenuts Carpal \'Tunnel     Join Date: Jul 2004 Location: Come With Me If You Want To Lift Posts: 31,549 Re: Stuck on a Sudoku: what's the next move? why can't r8c3 be 1?
07-11-2011, 04:20 AM   #11
mute
Carpal \'Tunnel

Join Date: Apr 2005
Location: Denmark
Posts: 11,815
Re: Stuck on a Sudoku: what's the next move?

Quote:
 Originally Posted by housenuts why can't r8c3 be 1?
because of r8c5 and r8c6

 07-11-2011, 08:35 PM #12 RoundTower ɹǝʍoʇpunoɹ     Join Date: Feb 2005 Location: soah made my profile Posts: 14,560 Re: Stuck on a Sudoku: what's the next move? alternately: because then nowhere in the bottom middle could be 1.

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