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Sudoku Solution Path

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R7C3 can only be <8>
R7C7 can only be <4>
R9C3 can only be <3>
R5C1 is the only square in row 5 that can be <2>
R6C8 is the only square in row 6 that can be <2>
R6C4 is the only square in row 6 that can be <5>
R8C9 is the only square in row 8 that can be <3>
R8C2 is the only square in column 2 that can be <5>
R6C2 is the only square in column 2 that can be <4>
R2C9 is the only square in column 9 that can be <4>
Squares R3C3 and R3C7 in row 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <27>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R3C2 - removing <7> from <17> leaving <1>
   R3C6 - removing <27> from <2467> leaving <46>
Squares R1C7 and R3C7 in column 7 form a simple locked pair. These 2 squares both contain the 2 possibilities <27>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R4C7 - removing <7> from <789> leaving <89>
   R8C7 - removing <7> from <789> leaving <89>
R8C8 is the only square in row 8 that can be <7>
Squares R5C9 and R6C9 in column 9 form a simple locked pair. These 2 squares both contain the 2 possibilities <78>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R1C9 - removing <7> from <567> leaving <56>
   R4C9 - removing <78> from <1678> leaving <16>
   R9C9 - removing <8> from <158> leaving <15>
R9C6 is the only square in row 9 that can be <8>
R8C7 is the only square in row 8 that can be <8>
R4C7 can only be <9>
R9C1 is the only square in row 9 that can be <4>
R8C1 can only be <1>
R5C4 is the only square in column 4 that can be <8>
R5C9 can only be <7>
R5C5 can only be <9>
R5C6 can only be <3>
R6C9 can only be <8>
R6C1 can only be <9>
R8C5 can only be <2>
R4C6 can only be <7>
R6C3 can only be <7>
R3C3 can only be <2>
R8C6 can only be <4>
R8C4 can only be <9>
R3C6 can only be <6>
R3C7 can only be <7>
R2C3 can only be <9>
R3C4 can only be <4>
R7C6 can only be <5>
R2C4 can only be <3>
R1C7 can only be <2>
R7C8 can only be <1>
R2C6 can only be <2>
R9C5 can only be <1>
R7C4 can only be <6>
R4C8 can only be <6>
R9C9 can only be <5>
R9C8 can only be <9>
R1C9 can only be <6>
R1C1 can only be <3>
R4C9 can only be <1>
R2C8 can only be <5>
R1C4 can only be <1>
R2C5 can only be <7>
R1C2 can only be <7>
R4C1 can only be <8>
R1C5 can only be <5>
R2C2 can only be <8>
R2C1 can only be <6>
R4C2 can only be <3>


 

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