I am currently stuck at this point in the below Sudoku puzzle. What is my next move and why?
Thanks!
I am currently stuck at this point in the below Sudoku puzzle. What is my next move and why?
Thanks!
Firstly note in the bottom right with the cell currently only with 6 as a candidate, 1 is also a candidate, so the actual grid should look like this (there would be a lot more 1s, but for now lets just add this one):
Now in the second to bottom row,
we have a pair of cells with the only candidates being 1 and 6. This means that the numbers 1 and 6 MUST appear in one of these two cells, and using this, 1 and 6 can be removed from all the other candidates in this row. This method is known as a pointing pair. This leaves a naked 9 which can solve a row. The rest of the sudoku is simple after this, and I'll leave you to solve: