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 Sudoku Solution Path    R1C7 can only be <7> R4C2 can only be <4> R5C7 is the only square in row 5 that can be <2> R5C1 is the only square in row 5 that can be <7> R1C2 is the only square in column 2 that can be <2> R7C3 is the only square in column 3 that can be <4> R7C6 can only be <3> R7C2 is the only square in row 7 that can be <1> R3C3 is the only square in column 3 that can be <1> R9C7 is the only square in column 7 that can be <6> R1C8 is the only square in column 8 that can be <4> R5C9 is the only square in column 9 that can be <5> R4C8 can only be <8> R4C5 can only be <5> Squares R2C1 and R2C9 in row 2 form a simple locked pair. These 2 squares both contain the 2 possibilities <38>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.    R2C4 - removing <3> from <234> leaving <24>    R2C5 - removing <3> from <1234> leaving <124> Squares R8C1 and R8C9 in row 8 form a simple locked pair. These 2 squares both contain the 2 possibilities <38>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.    R8C4 - removing <8> from <48> leaving <4>    R8C5 - removing <8> from <4689> leaving <469> R2C4 can only be <2> R7C5 is the only square in row 7 that can be <2> Squares R8C5 and R8C6 in block 8 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.    R9C5 - removing <9> from <789> leaving <78> Squares R2C5, R2C6, R5C5 and R5C6 form a Type-1 Unique Rectangle on <14>.    R5C5 - removing <14> from <1348> leaving <38> R5C6 is the only square in row 5 that can be <4> R2C6 can only be <1> R2C5 can only be <4> R5C8 is the only square in row 5 that can be <1> R6C8 can only be <9> R6C2 can only be <3> R6C5 can only be <1> Squares R8C5, R8C6, R3C5 and R3C6 form a Type-1 Unique Rectangle on <69>.    R3C5 - removing <69> from <3679> leaving <37> R3C6 is the only square in row 3 that can be <9> R8C6 can only be <6> R8C5 can only be <9> R3C2 is the only square in row 3 that can be <6> R5C2 can only be <9> R1C3 can only be <3> R5C3 can only be <6> R9C2 can only be <8> R9C5 can only be <7> R8C1 can only be <3> R9C8 can only be <3> R3C5 can only be <3> R7C4 can only be <8> R9C3 can only be <9> R3C8 can only be <5> R8C9 can only be <8> R1C5 can only be <6> R2C1 can only be <8> R2C9 can only be <3> R3C4 can only be <7> R5C5 can only be <8> R3C7 can only be <8> R7C8 can only be <7> R5C4 can only be <3> R7C7 can only be <5>