     Sudoku Solution Path   Copyright © Kevin Stone R1C2 can only be <3> R1C3 can only be <9> R5C1 is the only square in row 5 that can be <9> R5C3 is the only square in row 5 that can be <3> R7C9 is the only square in row 7 that can be <9> R2C7 is the only square in row 2 that can be <9> R8C4 is the only square in row 8 that can be <9> R4C3 is the only square in column 3 that can be <2> R3C7 is the only square in column 7 that can be <3> R2C4 is the only square in column 4 that can be <3> R9C4 is the only square in column 4 that can be <8> Squares R2C2 and R3C2 in column 2 form a simple locked pair. These 2 squares both contain the 2 possibilities <17>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.    R5C2 - removing <17> from <1478> leaving <48>    R8C2 - removing <17> from <1478> leaving <48> Squares R4C7 and R9C7 in column 7 form a simple locked pair. These 2 squares both contain the 2 possibilities <17>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.    R5C7 - removing <17> from <1678> leaving <68>    R6C7 - removing <17> from <1678> leaving <68> Squares R2C2 and R3C2 in block 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <17>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.    R2C1 - removing <17> from <1257> leaving <25>    R3C1 - removing <17> from <1257> leaving <25> Squares R5C7 and R6C7 in block 6 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.    R5C8 - removing <68> from <12568> leaving <125>    R5C9 - removing <68> from <1245678> leaving <12457>    R6C9 - removing <68> from <14678> leaving <147> R6C7 is the only square in row 6 that can be <6> R5C7 can only be <8> R5C2 can only be <4> R8C2 can only be <8> R6C1 is the only square in row 6 that can be <8> R7C8 is the only square in row 7 that can be <8> R7C3 is the only square in row 7 that can be <6> R4C4 is the only square in column 4 that can be <4> R4C9 is the only square in row 4 that can be <5> R1C9 can only be <8> R2C6 is the only square in row 2 that can be <8> R6C9 is the only square in row 6 that can be <4> R8C6 is the only square in column 6 that can be <2> R9C8 is the only square in row 9 that can be <2> R5C8 can only be <1> R8C8 can only be <6> R4C7 can only be <7> R2C8 can only be <5> R2C1 can only be <2> R4C1 can only be <1> R9C7 can only be <1> R5C9 can only be <2> R9C5 can only be <4> R8C9 can only be <7> R3C1 can only be <5> R3C4 can only be <6> R3C9 can only be <1> R5C4 can only be <5> R2C5 can only be <7> R3C2 can only be <7> R2C9 can only be <6> R7C1 can only be <3> R6C3 can only be <7> R5C6 can only be <7> R5C5 can only be <6> R6C6 can only be <1> R8C3 can only be <1> R7C6 can only be <5> R7C5 can only be <1> R1C6 can only be <4> R8C1 can only be <4> R9C1 can only be <7> R1C5 can only be <5> R8C5 can only be <3> R2C2 can only be <1> R3C5 can only be <2> [Puzzle Code = Sudoku-20180613-Hard-037146]    