     Sudoku Solution Path   Puzzle Copyright © Kevin Stone R1C4 can only be <2> R2C5 can only be <3> R2C6 can only be <8> R3C2 can only be <2> R3C6 can only be <6> R8C5 can only be <7> R5C5 can only be <5> R1C7 is the only square in row 1 that can be <6> R9C1 is the only square in row 9 that can be <3> R8C4 is the only square in row 8 that can be <3> R8C2 is the only square in column 2 that can be <1> R4C2 is the only square in column 2 that can be <3> R1C2 is the only square in column 2 that can be <8> R6C8 is the only square in column 8 that can be <8> R6C7 is the only square in row 6 that can be <3> R3C7 can only be <5> R3C8 can only be <3> R1C9 can only be <7> R1C1 can only be <5> R8C8 is the only square in row 8 that can be <5> Squares R6C1 and R6C6 in row 6 form a simple locked pair. These 2 squares both contain the 2 possibilities <79>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.    R6C3 - removing <79> from <2579> leaving <25>    R6C4 - removing <9> from <19> leaving <1>    R6C9 - removing <9> from <1259> leaving <125> Intersection of column 1 with block 4. The value <7> only appears in one or more of squares R4C1, R5C1 and R6C1 of column 1. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain this value.    R4C3 - removing <7> from <5789> leaving <589>    R5C2 - removing <7> from <679> leaving <69>    R5C3 - removing <7> from <2679> leaving <269> Intersection of row 5 with block 6. The value <7> only appears in one or more of squares R5C7, R5C8 and R5C9 of row 5. These squares are the ones that intersect with block 6. Thus, the other (non-intersecting) squares of block 6 cannot contain this value.    R4C7 - removing <7> from <179> leaving <19> R5C7 is the only square in column 7 that can be <7> R5C8 can only be <2> R6C9 can only be <5> R6C3 can only be <2> R2C9 is the only square in row 2 that can be <2> R4C3 is the only square in row 4 that can be <5> R4C1 is the only square in row 4 that can be <8> R8C1 can only be <9> R8C7 can only be <4> R6C1 can only be <7> R8C3 can only be <8> R2C7 can only be <1> R7C8 can only be <7> R2C8 can only be <4> R4C7 can only be <9> R4C4 can only be <4> R4C9 can only be <1> R9C9 can only be <9> R6C6 can only be <9> R9C6 can only be <4> R7C2 can only be <6> R9C8 can only be <1> R9C3 can only be <7> R4C6 can only be <7> R7C4 can only be <9> R7C3 can only be <4> R5C2 can only be <9> R2C3 can only be <9> R2C2 can only be <7> R5C3 can only be <6> [Puzzle Code = Sudoku-20200603-Hard-035622]    