Reduce Block Possibilities

In a Sudoku block, if any cell has an identified value, then no other cells in that block can have these values as their possibility.The unsolved cells in the block get reduced with the possible values other than these identified values.

An illustration for the above concept.

In the above block, since the values 8,5 and 7 are already present in the cells 1,3 and 6. No other cells in that block can have these values as their possibility.

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