Combined Possibility Reduction

In a sudoku block , if n number of cells have combination of values that are common between them. Then those possibilities can't be present in any other cells of that block.

An illustration for the above concept.

In the above row block, the possible values {1,6,7} are present as three different combinations {1,7} {1,6} and {6,7} among three cells. And hence, these values can be removed from the possibilities of others cells in the block.

Figure: A Row-Block from 9x9 sudoku.

Algorithm Links

• Reducing Block Possibilities
• Finding Unique Possibilities
• Block Overlap Reduction
• Repeated Possibility Reduction
• Combined Possibility Reduction
• Apply Possibility Reduction

Consecutive Sudoku Algorithms

• Apply Consecutive Constraint
• Consecutive Chain Min-Max Reduction
• Consecutive Chain Neighbor Reduction

Greater Sudoku Algorithms

• Apply Greater Sudoku Constraint
• Greater Sudoku Neighbor Reduction
• Greater Sudoku Graph Reduction