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 Sudoku Solution Path    R3C6 can only be <1> R1C6 can only be <4> R4C5 is the only square in row 4 that can be <4> R7C9 is the only square in row 7 that can be <3> R7C4 is the only square in row 7 that can be <4> R9C9 is the only square in row 9 that can be <4> R8C2 is the only square in row 8 that can be <4> R9C7 is the only square in row 9 that can be <6> R9C1 is the only square in row 9 that can be <8> R9C3 is the only square in row 9 that can be <5> Squares R2C8 and R2C9 in row 2 form a simple locked pair. These 2 squares both contain the 2 possibilities <19>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.    R2C1 - removing <19> from <1369> leaving <36>    R2C3 - removing <1> from <136> leaving <36> Squares R2C1 and R2C3 in block 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <36>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.    R1C1 - removing <3> from <123579> leaving <12579>    R1C3 - removing <3> from <1237> leaving <127> Squares R2C8 and R2C9 in block 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <19>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.    R1C7 - removing <19> from <1279> leaving <27>    R1C9 - removing <19> from <15789> leaving <578>    R3C7 - removing <9> from <279> leaving <27>    R3C9 - removing <9> from <5789> leaving <578> R8C7 is the only square in column 7 that can be <1> R8C9 can only be <7> R8C1 can only be <2> R7C8 is the only square in row 7 that can be <2> R9C8 can only be <9> R9C4 can only be <2> R2C8 can only be <1> R2C9 can only be <9> R9C6 can only be <7> R6C4 can only be <3> R9C5 can only be <1> R4C6 can only be <6> R5C6 can only be <2> R5C4 can only be <8> R7C5 can only be <9> R1C4 can only be <9> R3C5 can only be <8> R3C9 can only be <5> R1C5 can only be <3> R1C9 can only be <8> R5C9 can only be <6> R6C9 can only be <1> R6C3 is the only square in row 6 that can be <6> R2C3 can only be <3> R2C1 can only be <6> R5C3 can only be <7> R5C5 can only be <5> R7C3 can only be <1> R6C5 can only be <7> R6C8 can only be <5> R6C2 can only be <2> R4C8 can only be <7> R7C1 can only be <7> R1C3 can only be <2> R1C7 can only be <7> R1C2 can only be <5> R3C7 can only be <2> R3C1 can only be <9> R1C1 can only be <1> R4C2 can only be <9> R3C2 can only be <7> R5C1 can only be <3> R4C7 can only be <3> R4C1 can only be <5> R5C7 can only be <9>