     Sudoku Solution Path   Copyright © Kevin Stone R3C9 is the only square in row 3 that can be <6> R9C7 is the only square in column 7 that can be <7> R1C9 is the only square in column 9 that can be <3> Intersection of column 4 with block 5. The value <4> only appears in one or more of squares R4C4, R5C4 and R6C4 of column 4. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain this value.    R4C5 - removing <4> from <2458> leaving <258>    R5C5 - removing <4> from <124578> leaving <12578>    R6C5 - removing <4> from <1468> leaving <168> Intersection of block 2 with row 2. The value <9> only appears in one or more of squares R2C4, R2C5 and R2C6 of block 2. These squares are the ones that intersect with row 2. Thus, the other (non-intersecting) squares of row 2 cannot contain this value.    R2C1 - removing <9> from <2789> leaving <278>    R2C2 - removing <9> from <1289> leaving <128>    R2C8 - removing <9> from <1259> leaving <125> Intersection of block 6 with row 5. The value <8> only appears in one or more of squares R5C7, R5C8 and R5C9 of block 6. These squares are the ones that intersect with row 5. Thus, the other (non-intersecting) squares of row 5 cannot contain this value.    R5C1 - removing <8> from <248> leaving <24>    R5C3 - removing <8> from <28> leaving <2>    R5C4 - removing <8> from <45789> leaving <4579>    R5C5 - removing <8> from <12578> leaving <1257> R5C1 can only be <4> R3C5 is the only square in row 3 that can be <4> R1C2 is the only square in row 1 that can be <4> R9C2 is the only square in column 2 that can be <9> R7C7 is the only square in row 7 that can be <9> R3C7 can only be <8> R3C3 can only be <3> R1C7 can only be <1> R1C3 can only be <8> R5C7 can only be <5> R3C1 can only be <9> R9C3 can only be <5> R4C8 can only be <4> R7C3 can only be <1> R1C5 can only be <7> R5C5 can only be <1> R2C6 can only be <9> R2C4 can only be <8> R5C6 can only be <7> R1C1 can only be <2> R6C8 can only be <1> R5C9 can only be <8> R5C4 can only be <9> R1C8 can only be <9> R2C1 can only be <7> R7C1 can only be <6> R2C2 can only be <1> R4C4 can only be <5> R6C4 can only be <4> R8C4 can only be <7> R8C1 can only be <8> R9C1 can only be <3> R8C2 can only be <2> R8C6 can only be <6> R8C8 can only be <5> R6C6 can only be <3> R9C5 can only be <2> R8C9 can only be <1> R2C8 can only be <2> R7C9 can only be <2> R9C8 can only be <6> R9C9 can only be <4> R4C5 can only be <8> R7C5 can only be <5> R2C9 can only be <5> R4C2 can only be <3> R6C5 can only be <6> R6C2 can only be <8> R4C6 can only be <2> [Puzzle Code = Sudoku-20200523-Hard-096052]    