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Sudoku Solution Path

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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>


 

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