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Here is the sudoku - I could think the following only.

The top number box 3 coloumn wise should have some number - 6,7,3 (in some order). The box 3 column 2 -- 2,5,8 ( in some order), and box 3 column 3 - 1,4,9 in some order. Rest, I am really not able to identify what is wrong.

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I am really clueless here, I am not able to think further. What logic am I missing here?

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    $\begingroup$ Try typing it into an online sudoku solver. $\endgroup$ – ghosts_in_the_code Jan 2 '16 at 9:29
  • $\begingroup$ First, for each cell, anotate which number you can use. $\endgroup$ – Xwtek Jan 2 '16 at 11:06
  • $\begingroup$ If anybody wans to try to solve this sudoku himself: asudoku.com/… $\endgroup$ – VLAS Feb 8 '16 at 13:10
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Hints (that should be sufficient to allow simple reduction of possibilities):

In the second row, first box, you have a cell with possible numbers (4,6), and one with (1,6). In the second row, last column, you have a cell with (1,4) as possible numbers.

Thus, no other cells in this row can be (1,4,6), which nets you a 7 somewhere in the upper right 3x3 box.

After that, check around for other 7s - you should be able to find two immediately. Then check twos - you should find one. Carry through to completion.

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  • $\begingroup$ But 7 can come even on the second box, 2 nd row 3rd column. Also, 7 can come on third box - 2 nd row 1st column and 2nd column. So, in the second row - series - 2,7,8 can go anywhere. Sorry, I haven't understood about 7 yet. Please elaborate a bit. $\endgroup$ – dexterous Jan 2 '16 at 22:37
  • $\begingroup$ @dexterous_stranger I think emrakul messed up, because 146 is taken, the only number left for the first number second row third box is 7. From there it works $\endgroup$ – DrunkWolf Jan 3 '16 at 9:56
  • $\begingroup$ @DrunkWolf By "upper right box," I meant to refer to the upper-right set of nine squares; I've edited to clarify. $\endgroup$ – user20 Jan 3 '16 at 10:18
  • $\begingroup$ @Emrakul ah that makes sense then :) I do the occasional sudoku but am fairly unfamiliar with how people describe them :) $\endgroup$ – DrunkWolf Jan 3 '16 at 10:20
  • $\begingroup$ @DrunkWolf no worries! :] There are formal names that nobody uses, and I don't even think I'm using them here... but oh well, it needed to be clearer, so thanks! $\endgroup$ – user20 Jan 3 '16 at 10:22
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