Sudoku Solution Path    R1C9 is the only square in row 1 that can be <2> R9C9 can only be <9> R8C9 can only be <4> R3C9 can only be <1> R5C9 can only be <5> R1C5 is the only square in row 1 that can be <8> R9C1 is the only square in row 9 that can be <7> Squares R1C1 and R1C4 in row 1 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 row.    R1C2 - removing <14> from <1347> leaving <37>    R1C3 - removing <1> from <137> leaving <37> Squares R3C7 and R3C8 in row 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <46>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.    R3C3 - removing <6> from <356> leaving <35>    R3C5 - removing <4> from <3459> leaving <359> R2C3 is the only square in block 1 that can be <6> R4C3 can only be <9> R7C1 is the only square in column 1 that can be <9> R5C1 is the only square in column 1 that can be <8> R3C3 is the only square in column 3 that can be <5> R6C5 is the only square in column 5 that can be <5> Squares R7C5 and R9C5 in column 5 form a simple locked pair. These 2 squares both contain the 2 possibilities <16>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.    R4C5 - removing <6> from <346> leaving <34>    R5C5 - removing <16> from <13469> leaving <349> Squares R3C7 and R3C8 in block 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <46>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.    R2C7 - removing <4> from <478> leaving <78>    R2C8 - removing <4> from <478> leaving <78> Squares R7C5 and R9C5 in block 8 form a simple locked pair. These 2 squares both contain the 2 possibilities <16>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.    R7C4 - removing <16> from <126> leaving <2>    R9C6 - removing <1> from <128> leaving <28> R9C6 can only be <8> R4C8 is the only square in row 4 that can be <2> R9C8 can only be <6> R9C5 can only be <1> R9C7 can only be <2> R3C8 can only be <4> R3C7 can only be <6> R6C8 can only be <7> R2C8 can only be <8> R5C8 can only be <3> R7C5 can only be <6> R2C7 can only be <7> R4C5 is the only square in row 4 that can be <3> R3C5 can only be <9> R3C6 can only be <3> R5C5 can only be <4> R5C7 can only be <9> R4C4 can only be <6> R6C7 can only be <4> R6C2 can only be <1> R4C2 can only be <4> R5C4 can only be <1> R5C3 can only be <7> R5C6 can only be <2> R1C4 can only be <4> R6C6 can only be <9> R7C2 can only be <3> R8C6 can only be <5> R7C7 can only be <8> R1C2 can only be <7> R8C2 can only be <2> R8C3 can only be <8> R7C3 can only be <1> R8C7 can only be <3> R8C4 can only be <9> R2C6 can only be <1> R1C3 can only be <3> R5C2 can only be <6> R1C1 can only be <1> R2C4 can only be <5> R2C1 can only be <4>