Solve with two middle adjacent empty sub-regions?

Advanced methods and approaches for solving Sudoku puzzles

Solve with two middle adjacent empty sub-regions?

Postby NotionCommotion » Thu Jul 23, 2015 5:46 am

Let's say I have a puzzle complete except for a sub-region to the left and right of the middle sub-region (have top and bottom sub-regions as well as four corner sub-regions complete).

What is a good strategy to proceed?
NotionCommotion
 
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