     Sudoku Solution Path   Copyright © Kevin Stone R6C3 can only be <6> R7C4 can only be <1> R4C3 can only be <2> R9C3 can only be <7> R7C6 can only be <6> R7C1 can only be <3> R7C9 can only be <9> R1C3 can only be <3> R3C1 can only be <4> R3C9 is the only square in row 3 that can be <3> R8C9 is the only square in row 8 that can be <7> R9C2 is the only square in row 9 that can be <4> R1C7 is the only square in column 7 that can be <7> R2C2 is the only square in column 2 that can be <7> R1C2 is the only square in column 2 that can be <8> Squares R1C1 and R2C1 in column 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <29>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.    R5C1 - removing <9> from <159> leaving <15> Squares R3C4 and R3C6 in block 2 form a simple locked pair. These 2 squares both contain the 2 possibilities <78>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.    R2C4 - removing <8> from <248> leaving <24>    R2C6 - removing <8> from <2489> leaving <249> Squares R1C8 and R1C9 in block 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <14>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.    R2C8 - removing <4> from <468> leaving <68>    R2C9 - removing <4> from <468> leaving <68> R1C9 is the only square in column 9 that can be <4> R1C8 can only be <1> Intersection of row 5 with block 5. The values <29> only appears in one or more of squares R5C4, R5C5 and R5C6 of row 5. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain these values.    R4C5 - removing <9> from <69> leaving <6>    R4C6 - removing <9> from <1479> leaving <147>    R6C5 - removing <9> from <589> leaving <58>    R6C6 - removing <9> from <1489> leaving <148> R5C9 is the only square in row 5 that can be <6> R2C9 can only be <8> R2C8 can only be <6> R9C9 can only be <1> R9C7 can only be <6> R9C1 can only be <5> R5C1 can only be <1> R8C2 can only be <1> R8C1 can only be <6> R4C2 can only be <9> R4C7 can only be <1> R6C2 can only be <5> R6C7 can only be <9> R6C5 can only be <8> R9C5 can only be <2> R9C8 can only be <8> R1C5 can only be <9> R8C6 can only be <8> R8C8 can only be <2> R1C1 can only be <2> R5C5 can only be <5> R5C4 can only be <2> R8C4 can only be <5> R3C6 can only be <7> R2C1 can only be <9> R3C4 can only be <8> R4C6 can only be <4> R4C8 can only be <3> R2C6 can only be <2> R6C6 can only be <1> R6C4 can only be <3> R4C4 can only be <7> R6C8 can only be <4> R5C6 can only be <9> R2C4 can only be <4> [Puzzle Code = Sudoku-20190212-Hard-197130]    