Interaction strategy for solving sudoku
Advanced strategies
Line, block and column interactions
The configuration of certain area can limit candidates to a line or a column for a block. This technique consists in using the interaction on the other blocks: this candidate is to be eliminated from this line or this column for the aligned blocks.
Example
Example of interaction between areas:
The interaction relates to the 7.
In the block of right-hand side, the 7 is on the top line since it is not candidate in other boxes of this block. We must eliminate the 7 on this same line in the other aligned blocks.
Strategies list
Elimination of candidates by interaction in the same area
Elimination of candidates by interaction in several areas
Elimination of candidates by interaction in all the puzzle
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