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Sudoku Solution Path

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R1C5 can only be <1>
R2C4 can only be <2>
R3C1 can only be <8>
R4C4 can only be <4>
R8C6 can only be <4>
R5C5 can only be <6>
R2C6 can only be <6>
R6C4 can only be <8>
R2C5 can only be <7>
R4C6 can only be <1>
R4C2 can only be <6>
R4C8 can only be <5>
R6C6 can only be <2>
R3C8 can only be <7>
R8C4 can only be <9>
R5C1 is the only square in row 5 that can be <4>
R7C1 is the only square in row 7 that can be <6>
R8C7 is the only square in row 8 that can be <6>
R8C5 is the only square in row 8 that can be <5>
R9C5 can only be <8>
Squares R1C1 and R1C7 in row 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <39>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R1C3 - removing <3> from <234> leaving <24>
   R1C9 - removing <9> from <249> leaving <24>
Squares R5C2 and R6C2 in column 2 form a simple locked pair. These 2 squares both contain the 2 possibilities <13>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R2C2 - removing <3> from <359> leaving <59>
   R8C2 - removing <1> from <128> leaving <28>
Intersection of column 7 with block 3. The value <3> only appears in one or more of squares R1C7, R2C7 and R3C7 of column 7. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.
   R2C8 - removing <3> from <349> leaving <49>
Squares R6C2, R6C8, R5C2 and R5C8 form a Type-1 Unique Rectangle on <13>.
   R5C8 - removing <13> from <139> leaving <9>
R5C9 can only be <1>
R2C8 can only be <4>
R5C2 can only be <3>
R6C8 can only be <3>
R6C2 can only be <1>
R2C3 can only be <3>
R7C8 can only be <8>
R1C9 can only be <2>
R7C2 can only be <9>
R8C8 can only be <1>
R8C3 can only be <2>
R1C3 can only be <4>
R3C9 can only be <5>
R9C3 can only be <1>
R1C1 can only be <9>
R3C2 can only be <2>
R9C9 can only be <9>
R2C7 can only be <9>
R7C9 can only be <4>
R2C2 can only be <5>
R9C1 can only be <3>
R8C2 can only be <8>
R9C7 can only be <5>
R1C7 can only be <3>


 

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