When two cells forming a _Naked Pair_ (two identical candidates confined to two cells) are located in two overlapping houses (e.g., a row and a
block, or a column and a block), this is termed a Locked Pair. Candidates can be eliminated from both houses.
Example 1
Cells R3C7 and R3C9 form a Locked Pair in Row 3 (R3) and Block 3 (B3). This eliminates candidate 2 from R3C3 (within the row) and R1C9 (within the
block).
Example 2
A Locked Pair in Row 8 (R8) and Block 8 (B8) removes 18 candidates across both houses.
My Profile
