     Sudoku Solution Path   Copyright © Kevin Stone R9C3 can only be <1> R3C8 is the only square in row 3 that can be <6> R4C2 is the only square in row 4 that can be <7> R3C1 is the only square in row 3 that can be <7> R1C9 is the only square in row 1 that can be <7> R6C8 is the only square in row 6 that can be <8> R6C4 is the only square in row 6 that can be <2> R6C5 is the only square in row 6 that can be <5> R9C2 is the only square in row 9 that can be <5> R8C2 can only be <9> R8C3 can only be <2> R7C2 can only be <3> R6C2 can only be <4> R9C1 can only be <6> R6C3 can only be <9> R6C1 can only be <3> R3C3 can only be <4> R5C1 can only be <1> R2C1 can only be <2> R1C1 can only be <9> R3C6 is the only square in row 3 that can be <2> R8C4 is the only square in row 8 that can be <5> R7C7 is the only square in row 7 that can be <5> R4C8 is the only square in column 8 that can be <9> R9C8 is the only square in column 8 that can be <3> Intersection of column 5 with block 5. The value <4> only appears in one or more of squares R4C5, R5C5 and R6C5 of column 5. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain this value.    R4C6 - removing <4> from <134> leaving <13>    R5C4 - removing <4> from <3469> leaving <369>    R5C6 - removing <4> from <3469> leaving <369> Intersection of column 4 with block 2. The value <4> only appears in one or more of squares R1C4, R2C4 and R3C4 of column 4. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain this value.    R2C6 - removing <4> from <1348> leaving <138> Intersection of column 8 with block 3. The value <4> only appears in one or more of squares R1C8, R2C8 and R3C8 of column 8. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.    R1C7 - removing <4> from <248> leaving <28>    R2C7 - removing <4> from <48> leaving <8> R1C7 can only be <2> R4C7 can only be <4> R4C5 can only be <1> R5C9 can only be <3> R4C9 can only be <2> R4C6 can only be <3> R2C6 can only be <1> R2C8 can only be <4> R8C6 can only be <4> R1C4 can only be <4> R3C4 can only be <9> R2C4 can only be <3> R1C8 can only be <1> R3C5 can only be <8> R5C4 can only be <6> R3C2 can only be <1> R7C5 can only be <9> R5C6 can only be <9> R7C4 can only be <1> R5C5 can only be <4> R7C8 can only be <2> R7C9 can only be <8> R7C6 can only be <6> R9C9 can only be <4> R8C9 can only be <1> R9C6 can only be <8> R1C2 can only be <8> [Puzzle Code = Sudoku-20190416-Hard-028105]    