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It seems to me that there is more than one posibility for the next move, I find it hard to know what. Can you teach me find the options?

[678]9[4678],[478]12,5[46]3
5[24678]1,3[78][48],[678]9[24678]
[2378]]23478][23478],596,[78][24]1

[12367][23467]9,[467][367][34],[1367]85
[3678][34678][3478],251,9[346][467]
[1367]5[347],[4678][3678]9,2[1346]467]

4[2378][3578],9[2368][38],[1368][12356][268]
[238]1[2358],[68][2368]7,4[2356]9
9[238]6,145,[38]7[28]

You have a candidate 6 in r1c3 that can't be there (as there's a 6 in r9c3), but it doesn't help much. I put this into Sudoku Susser, which needs Nishio to solve it. In other words, it's really hard. Perhaps someone who understands these ridiculously complex methods can be more helpful.

Kites wrote:It seems to me that there is more than one posibility for the next move, I find it hard to know what. Can you teach me find the options?

[678]9[4678],[478]12,5[46]3
5[24678]1,3[78][48],[678]9[24678]
[2378]]23478][23478],596,[78][24]1

[12367][23467]9,[467][367][34],[1367]85
[3678][34678][3478],251,9[346][467]
[1367]5[347],[4678][3678]9,2[1346]467]

4[2378][3578],9[2368][38],[1368][12356][268]
[238]1[2358],[68][2368]7,4[2356]9
9[238]6,145,[38]7[28]

Have a look at the 2's - there seems to be an 'x-wing' pattern (row 2 and 9) - which means that candidate 2 can be excluded from all cells in column two and nine except those in row 2 and 9.

Ocean wrote:

Kites wrote:It seems to me that there is more than one posibility for the next move, I find it hard to know what. Can you teach me find the options?

[678]9[4678],[478]12,5[46]3
5[24678]1,3[78][48],[678]9[24678]
[2378]]23478][23478],596,[78][24]1

[12367][23467]9,[467][367][34],[1367]85
[3678][34678][3478],251,9[346][467]
[1367]5[347],[4678][3678]9,2[1346]467]

4[2378][3578],9[2368][38],[1368][12356][268]
[238]1[2358],[68][2368]7,4[2356]9
9[238]6,145,[38]7[28]

Have a look at the 2's - there seems to be an 'x-wing' pattern (row 2 and 9) - which means that candidate 2 can be excluded from all cells in column two and nine except those in row 2 and 9.

Thank you very much for pointing 'x-wing' - this puzzle is solved now!

PaulIQ164 wrote:You have a candidate 6 in r1c3 that can't be there (as there's a 6 in r9c3), but it doesn't help much. I put this into Sudoku Susser, which needs Nishio to solve it. In other words, it's really hard. Perhaps someone who understands these ridiculously complex methods can be more helpful.

Thanks Paul, you were right about the 6.