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.
Thursday, 11 March 2010
Solving Sudoku puzzles made easy (part 7)
My latest blogpost: Solving Sudoku puzzles made easy (part 7)Tweet this! Posted by Mark Wadsworth at 12:00
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