| This is the sequence: 1 in GM, then 4 in IM, then 4 in GL, then 8 in GK, then 5 in IM, then 5 in FK, then 8 in BL, then 2 in AK, then 6 in FR, then 9 in AR, then 8 in AP. Therefore, there are only 2 blank cells left in row A: Cells AO & AQ. According to sudoku rules, we must have the numbers 1 through 9 in every row. Hence, we know the number 6 must be in either cell AO or AQ, but quick examination indicates that we can’t put the number 6 in cell AO because there’s a 6 in cell IO on the same colum. We can’t put the number 6 in cell AQ either, because there’s a 6 in GQ on the same column.
The inevitable conclusion for this sudoku sequence is apparent: The number 1 cannot be in cell GM, for it would lead to this wrong sequence. We now know with certainty that the number in cell GM must
be 4.
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