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Sudoku Solution Path

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R3C3 can only be <6>
R5C9 can only be <4>
R7C3 can only be <4>
R2C3 can only be <1>
R8C3 can only be <5>
R5C4 is the only square in row 5 that can be <7>
R6C5 is the only square in row 6 that can be <8>
R7C2 is the only square in row 7 that can be <7>
R3C2 can only be <2>
R3C7 can only be <9>
R3C8 can only be <7>
R7C7 can only be <3>
R7C8 can only be <9>
R9C9 can only be <6>
R2C1 is the only square in row 2 that can be <7>
R1C1 is the only square in column 1 that can be <4>
Squares R4C4 and R4C8 in row 4 form a simple locked pair. These 2 squares both contain the 2 possibilities <35>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R4C6 - removing <3> from <1234> leaving <124>
Squares R1C2 and R2C2 in column 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 column.
   R8C2 - removing <3> from <1369> leaving <169>
   R9C2 - removing <3> from <139> leaving <19>
R9C1 is the only square in row 9 that can be <3>
Squares R4C8 and R6C8 in column 8 form a simple locked pair. These 2 squares both contain the 2 possibilities <35>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R1C8 - removing <3> from <368> leaving <68>
   R2C8 - removing <3> from <3468> leaving <468>
Squares R4C4, R4C8, R6C4 and R6C8 form a Type-1 Unique Rectangle on <35>.
   R6C4 - removing <35> from <356> leaving <6>
R6C2 can only be <4>
R2C4 can only be <9>
R5C5 can only be <9>
R2C6 can only be <2>
R8C4 can only be <3>
R2C7 can only be <4>
R1C5 can only be <6>
R8C7 can only be <2>
R5C6 can only be <1>
R9C5 can only be <4>
R5C1 can only be <6>
R4C6 can only be <4>
R6C6 can only be <3>
R4C2 can only be <1>
R6C8 can only be <5>
R4C4 can only be <5>
R4C8 can only be <3>
R8C9 can only be <8>
R2C9 can only be <3>
R9C8 can only be <1>
R4C5 can only be <2>
R8C6 can only be <9>
R9C2 can only be <9>
R8C8 can only be <4>
R1C8 can only be <8>
R1C2 can only be <3>
R2C8 can only be <6>
R2C2 can only be <8>
R1C9 can only be <2>
R8C1 can only be <1>
R8C2 can only be <6>


 

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