Thursday, 11 March 2010

Solving Sudoku puzzles made easy (part 7)

In the previous part, we noted where 1 and 4 could go in the centre box, i.e. in row six, so we know without even looking that the 5 must go in the only empty space left in row six.
That then leaves you with only one place where the 5 can go in the bottom-right box.
In row six, we now only have 1,2 and 4 missing. There's only one place that the 2 can go, so do that, and note where the 1 and 4 could go for future reference.
While we're at it, we can also write down where the 1,6 and 7 could go in the middle-right box for future reference.
In the next part, we'll attack row nine (the bottom row), so write down the missing numbers 2,4,6,9 in the margin.
Full series here.

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