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Sudoku Solution Path

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R3C3 can only be <8>
R3C7 can only be <5>
R5C7 can only be <2>
R7C3 can only be <9>
R7C5 can only be <5>
R3C5 can only be <7>
R7C7 can only be <1>
R5C9 can only be <7>
R5C3 can only be <6>
R1C1 is the only square in row 1 that can be <5>
R2C8 is the only square in row 2 that can be <7>
R4C4 is the only square in row 4 that can be <2>
R9C8 is the only square in row 9 that can be <8>
R8C1 is the only square in column 1 that can be <7>
R8C9 is the only square in column 9 that can be <5>
Squares R5C4 and R5C6 in row 5 form a simple locked pair. These 2 squares both contain the 2 possibilities <48>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R5C5 - removing <4> from <349> leaving <39>
Squares R6C4 and R6C8 in row 6 form a simple locked pair. These 2 squares both contain the 2 possibilities <56>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R6C5 - removing <6> from <136> leaving <13>
   R6C6 - removing <5> from <157> leaving <17>
Squares R5C6 and R8C6 in column 6 form a simple locked pair. These 2 squares both contain the 2 possibilities <48>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R2C6 - removing <4> from <145> leaving <15>
Squares R5C4, R5C6, R8C4 and R8C6 form a Type-1 Unique Rectangle on <48>.
   R8C4 - removing <48> from <468> leaving <6>
R8C2 can only be <3>
R6C4 can only be <5>
R9C5 can only be <4>
R9C9 can only be <3>
R1C5 can only be <1>
R8C6 can only be <8>
R9C1 can only be <2>
R8C8 can only be <4>
R1C2 can only be <2>
R6C5 can only be <3>
R2C6 can only be <5>
R2C4 can only be <4>
R4C6 can only be <7>
R4C2 can only be <9>
R6C6 can only be <1>
R6C8 can only be <6>
R6C2 can only be <7>
R5C5 can only be <9>
R4C8 can only be <5>
R5C6 can only be <4>
R1C8 can only be <3>
R9C2 can only be <6>
R2C1 can only be <9>
R1C9 can only be <4>
R2C9 can only be <2>
R2C2 can only be <1>
R5C1 can only be <3>
R5C4 can only be <8>
R4C5 can only be <6>


 

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