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 Sudoku Solution Path    R1C5 can only be <1> R2C4 can only be <2> R3C1 can only be <8> R4C4 can only be <4> R8C6 can only be <4> R5C5 can only be <6> R2C6 can only be <6> R6C4 can only be <8> R2C5 can only be <7> R4C6 can only be <1> R4C2 can only be <6> R4C8 can only be <5> R6C6 can only be <2> R3C8 can only be <7> R8C4 can only be <9> R5C1 is the only square in row 5 that can be <4> R7C1 is the only square in row 7 that can be <6> R8C7 is the only square in row 8 that can be <6> R8C5 is the only square in row 8 that can be <5> R9C5 can only be <8> Squares R1C1 and R1C7 in row 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <39>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.    R1C3 - removing <3> from <234> leaving <24>    R1C9 - removing <9> from <249> leaving <24> Squares R5C2 and R6C2 in column 2 form a simple locked pair. These 2 squares both contain the 2 possibilities <13>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.    R2C2 - removing <3> from <359> leaving <59>    R8C2 - removing <1> from <128> leaving <28> Intersection of column 7 with block 3. The value <3> only appears in one or more of squares R1C7, R2C7 and R3C7 of column 7. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.    R2C8 - removing <3> from <349> leaving <49> Squares R6C2, R6C8, R5C2 and R5C8 form a Type-1 Unique Rectangle on <13>.    R5C8 - removing <13> from <139> leaving <9> R5C9 can only be <1> R2C8 can only be <4> R5C2 can only be <3> R6C8 can only be <3> R6C2 can only be <1> R2C3 can only be <3> R7C8 can only be <8> R1C9 can only be <2> R7C2 can only be <9> R8C8 can only be <1> R8C3 can only be <2> R1C3 can only be <4> R3C9 can only be <5> R9C3 can only be <1> R1C1 can only be <9> R3C2 can only be <2> R9C9 can only be <9> R2C7 can only be <9> R7C9 can only be <4> R2C2 can only be <5> R9C1 can only be <3> R8C2 can only be <8> R9C7 can only be <5> R1C7 can only be <3>