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Stuck on a Sudoku: what's the next move? Stuck on a Sudoku: what's the next move?
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07-10-2011 , 09:33 PM
#1
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dumbest smart person his mom knows
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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.
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07-10-2011 , 09:51 PM
#2
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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.
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07-10-2011 , 09:57 PM
#3
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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
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07-10-2011 , 10:01 PM
#4
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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.
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07-10-2011 , 10:14 PM
#5
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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.
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07-10-2011 , 10:21 PM
#6
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Yep! Nice one, bob.
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07-10-2011 , 10:24 PM
#7
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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.
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07-11-2011 , 12:01 AM
#8
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lock?
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07-11-2011 , 01:43 AM
#9
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I got so addicted to sudoku last year, literally doing about 20 a day.
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07-11-2011 , 02:15 AM
#10
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why can't r8c3 be 1?
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07-11-2011 , 04:20 AM
#11
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Quote:
Originally Posted by housenuts
why can't r8c3 be 1?
because of r8c5 and r8c6
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07-11-2011 , 08:35 PM
#12
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alternately: because then nowhere in the bottom middle could be 1.
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