     Sudoku Solution Path   Sudoku Puzzle © Kevin Stone R2C2 is the only square in row 2 that can be <7> R3C7 is the only square in row 3 that can be <7> R5C5 is the only square in row 5 that can be <3> R5C3 is the only square in row 5 that can be <7> R6C1 can only be <2> R5C6 is the only square in row 5 that can be <2> R6C5 is the only square in row 6 that can be <7> R7C1 is the only square in row 7 that can be <7> R7C5 is the only square in block 8 that can be <1> Squares R4C2 and R5C2 in column 2 form a simple locked pair. These 2 squares both contain the 2 possibilities <45>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.    R7C2 - removing <4> from <2469> leaving <269>    R8C2 - removing <4> from <3469> leaving <369>    R9C2 - removing <4> from <1349> leaving <139> Intersection of row 2 with block 3. The value <3> only appears in one or more of squares R2C7, R2C8 and R2C9 of row 2. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.    R1C8 - removing <3> from <12368> leaving <1268>    R1C9 - removing <3> from <368> leaving <68> R2C9 is the only square in column 9 that can be <3> Squares R1C7 and R1C9 in row 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <68>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.    R1C2 - removing <6> from <12369> leaving <1239>    R1C6 - removing <8> from <189> leaving <19>    R1C8 - removing <68> from <1268> leaving <12> Squares R1C7 and R1C9 in block 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <68>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.    R2C8 - removing <6> from <156> leaving <15>    R3C8 - removing <68> from <124568> leaving <1245>    R3C9 - removing <68> from <4568> leaving <45> R2C5 is the only square in row 2 that can be <6> Intersection of column 4 with block 8. The values <49> only appears in one or more of squares R7C4, R8C4 and R9C4 of column 4. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain these values.    R8C5 - removing <9> from <89> leaving <8> R8C1 can only be <6> R3C1 can only be <1> R9C1 can only be <8> R3C2 is the only square in row 3 that can be <6> R3C6 is the only square in row 3 that can be <8> R4C9 is the only square in row 4 that can be <8> R1C9 can only be <6> R1C7 can only be <8> R4C2 is the only square in row 4 that can be <4> R5C2 can only be <5> R5C4 is the only square in row 5 that can be <8> R7C8 is the only square in row 7 that can be <8> R7C7 is the only square in row 7 that can be <6> R5C7 can only be <4> R5C8 can only be <6> R9C7 can only be <5> R6C8 can only be <5> R6C4 can only be <6> R2C8 can only be <1> R7C9 can only be <4> R2C6 can only be <5> R1C8 can only be <2> R3C9 can only be <5> R3C8 can only be <4> R4C6 can only be <9> R3C5 can only be <9> R3C3 can only be <2> R4C5 can only be <5> R1C6 can only be <1> R7C3 can only be <9> R7C2 can only be <2> R7C4 can only be <5> R1C3 can only be <3> R8C2 can only be <3> R8C8 can only be <9> R1C2 can only be <9> R9C2 can only be <1> R9C3 can only be <4> R8C4 can only be <4> R9C8 can only be <3> R9C4 can only be <9>    