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Three Sudoku squares in a row help solve puzzle

Word puzzle query [Game solving Strategies forum] contributed by Rob Puzzle

The answers are not as clear cut as I thought. I'm having a problem getting the remaining answer. Any suggestions?

See also : C Shape
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Block of Three (re: Word puzzle query) contributed by Rob Puzzle

The key reason why a block of three in a row or column is that it forces allocation in just one adjacent row or column set of three, narrowing down the options substantially.

Also if you look along the block of three into the adjacent Sudoku regions you know that all these numbers must occur in either of the remaining two sub-rows/columns.

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