Observe how by locking the two cells valued at 3-7 in the # 2 grid (upper center).
We can deduce that the lower left cell is also an 8-9 value cell.
This action creates two locked cells in a column, valued 8-9.
"We may deduce that the values 8-9 in the column are figured to be either square and by consequence we can continue solving the rest of such column, in search of the other values.
Scroll up to the next post, please.
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