#1
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Need help with a Sudoku
12_ 346 57_
___ __5 _62 56_ 27_ __3 697 152 834 2_1 7__ 956 _53 _6_ 217 9_6 4_8 _25 __5 62_ ___ __2 597 641 Sorry I'm too ignorant to come up with a better way to display that. I got that far, then stumped. I took a few guesses, and solved the puzzle. But you're not supposed to guess on these things. Don't solve it for me, just tell me the next move, because I sure don't see it. |
#2
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Re: Need help with a Sudoku
I have been doing this for 25 mins now...can't find the next move either.....
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#3
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Re: Need help with a Sudoku
I think you might have filled this in wrong> i've put in ever possible number and it always comes down to guessing.
No it's right. |
#4
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Re: Need help with a Sudoku
what was the original? it ends up in no mans land in the end for me [img]/images/graemlins/confused.gif[/img]
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#5
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Re: Need help with a Sudoku
the numbers are right but it does come down to guessing. Let the bottom left quadrant, top line middle number be 1, betwwen the 9 and 6.
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#6
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Re: Need help with a Sudoku
The numbers are right and there is a unique solution. It seems to be a tough one. I didn't solve it but put it in my pocket sudoku which could solve it only by applying all its tricks. If you want to get the solution I'll post it in while...
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#7
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Re: Need help with a Sudoku
I entered it here: http://www.sudokusolver.co.uk/ and it said you have to guess.
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#8
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Re: Need help with a Sudoku
[ QUOTE ]
12_ 346 57_ ___ __5 _62 56_ 27_ __3 697 152 834 2_1 7__ 956 _53 _6_ 217 9_6 4_8 _25 __5 62_ ___ __2 597 641 Sorry I'm too ignorant to come up with a better way to display that. I got that far, then stumped. I took a few guesses, and solved the puzzle. But you're not supposed to guess on these things. Don't solve it for me, just tell me the next move, because I sure don't see it. [/ QUOTE ] In spots like this I play out options in my head until I run into a contradiction. ~D |
#9
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Re: Need help with a Sudoku
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#10
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Re: Need help with a Sudoku
Take these points under consideration:
__x ___ __h aax qq_ s__ __x __q sh_ ___ ___ ___ _B_ _F_ ___ b__ ___ ___ _C_ _E_ ___ cc_ ___ _gg dd_ ___ ___ The g squares are leaf squares. Although choosing them first (randomly) can force the rest of the puzzle, they only interact with one other square each, and again that other square has 8 and 9 as options (the h squares here). Hence, ignore the g squares. Tricks like this help you narrow down where you need to look. Similarly, the h, s, and x squares don't affect anywhere else, ie they are forced by the q squares. So, to conclude, the puzzle will have to be solved by the interactions among the bottom-left 6x6 subgrid (and maybe aa and qqq). An out is suggested by the common two-value pairs in the leftmost two columns. The a squares have to be 3 or 7. Note that there is no interaction with these two squares and anything else in the row; it is leaf-ish in that a forced restriction somewhere else is going to be easier to find. They are not true leaves because the 3 and 7 occur in different places elsewhere in the columns. Compare the gg and hh squares: the g squares are perfectly determined soley by the h squares. There's no internal restrictions or interactions there. Here, a interacts with b, c, and d squares. Now look at the sets aa, Bb, Ccc, and dd. For one column, where there's a 7 in one of the c squares, there's a 3 in a, an 8 in d, and a 4 in b. This reduces to: in a column where there's a 7 in a c square, there's a 4 in the respective b square. I'll call this the c7b4 column restriction. Now take BFEC. An 8 needs to be in either B or F, and a 3 in F or E, and a 1 in E or C. So BFEC is either 831x or x831. This 'forcing loop' puts restrictions on the Bb and Ccc squares. Next step, in white: <font color="white">combine the forced loop with the c7b4 column restriction: if BFEC is 831x, then C has to be 7, which contradicts the column restriction. Hence BFEC is x831.</font> |
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