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 Sudoku Solution Path   R1C7 is the only square in row 1 that can be <2> R2C7 is the only square in row 2 that can be <5> R4C9 is the only square in row 4 that can be <3> R8C9 is the only square in row 8 that can be <4> R2C9 can only be <9> R2C1 can only be <3> R2C8 can only be <4> R5C8 can only be <8> R4C1 is the only square in row 4 that can be <8> R6C7 is the only square in row 6 that can be <9> R8C2 is the only square in row 8 that can be <8> R3C6 is the only square in column 6 that can be <5> R3C5 is the only square in row 3 that can be <8> R4C4 is the only square in column 4 that can be <5> R9C8 is the only square in column 8 that can be <9> R6C5 is the only square in block 5 that can be <7> R1C4 is the only square in row 1 that can be <7> Squares R1C8 and R3C8 in block 3 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.    R3C7 - removing <6> from <167> leaving <17>    R3C9 - removing <6> from <167> leaving <17> Squares R3C7 and R3C9 in row 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <17>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.    R3C1 - removing <1> from <169> leaving <69>    R3C3 - removing <1> from <1469> leaving <469> Squares R3C1 and R8C1 in column 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <69>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.    R6C1 - removing <6> from <126> leaving <12>    R7C1 - removing <69> from <2679> leaving <27> Squares R8C1 and R8C3 in block 7 form a simple locked pair. These 2 squares both contain the 2 possibilities <69>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.    R7C2 - removing <6> from <56> leaving <5>    R7C3 - removing <69> from <235679> leaving <2357>    R9C2 - removing <6> from <16> leaving <1>    R9C3 - removing <6> from <12367> leaving <1237> R5C2 can only be <4> R5C7 can only be <1> R1C2 can only be <6> R5C9 can only be <2> R3C7 can only be <7> R5C1 can only be <7> R6C9 can only be <6> R7C9 can only be <7> R4C7 can only be <4> R7C1 can only be <2> R3C9 can only be <1> R1C8 can only be <3> R3C1 can only be <9> R3C8 can only be <6> R3C3 can only be <4> R8C1 can only be <6> R3C4 can only be <3> R1C3 can only be <1> R9C4 can only be <6> R4C5 can only be <2> R5C3 can only be <5> R7C3 can only be <3> R6C1 can only be <1> R9C3 can only be <7> R8C3 can only be <9> R9C7 can only be <8> R7C4 can only be <4> R9C6 can only be <2> R7C7 can only be <6> R6C3 can only be <2> R4C3 can only be <6> R9C5 can only be <3> R6C6 can only be <4> R1C6 can only be <9> R7C5 can only be <9> R7C6 can only be <8> R1C5 can only be <4>

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