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Sudoku Solution Path

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R3C3 is the only square in row 3 that can be <3>
R3C7 is the only square in row 3 that can be <5>
R1C3 is the only square in row 1 that can be <5>
R4C5 is the only square in row 4 that can be <5>
R8C2 is the only square in column 2 that can be <4>
R7C3 is the only square in column 3 that can be <7>
R7C4 can only be <4>
R1C4 can only be <9>
Squares R1C6 and R3C6 in column 6 form a simple locked pair. These 2 squares both contain the 2 possibilities <24>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R5C6 - removing <4> from <4678> leaving <678>
   R6C6 - removing <4> from <3468> leaving <368>
   R8C6 - removing <2> from <237> leaving <37>
   R9C6 - removing <2> from <238> leaving <38>
R8C5 is the only square in block 8 that can be <2>
R8C8 can only be <3>
R8C6 can only be <7>
Intersection of column 1 with block 4. The value <8> only appears in one or more of squares R4C1, R5C1 and R6C1 of column 1. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain this value.
   R5C2 - removing <8> from <2689> leaving <269>
Intersection of column 1 with block 7. The values <59> only appears in one or more of squares R7C1, R8C1 and R9C1 of column 1. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain these values.
   R9C3 - removing <9> from <29> leaving <2>
R4C1 is the only square in column 1 that can be <2>
R4C9 can only be <3>
R6C9 can only be <4>
R6C5 can only be <1>
R6C3 can only be <6>
R2C5 can only be <7>
R4C4 can only be <8>
R2C4 can only be <1>
R5C5 can only be <4>
R4C7 can only be <1>
R5C4 can only be <7>
R9C4 can only be <3>
R5C6 can only be <6>
R5C2 can only be <9>
R6C6 can only be <3>
R6C1 can only be <8>
R2C3 can only be <9>
R9C6 can only be <8>
R5C3 can only be <1>
R3C2 can only be <2>
R3C6 can only be <4>
R3C9 can only be <9>
R1C6 can only be <2>
R1C9 can only be <6>
R1C2 can only be <8>
R2C9 can only be <2>
R2C8 can only be <8>
R1C7 can only be <4>
R2C2 can only be <6>
R9C7 can only be <9>
R5C8 can only be <2>
R5C7 can only be <8>
R7C8 can only be <5>
R7C1 can only be <6>
R9C8 can only be <4>
R9C1 can only be <5>
R8C7 can only be <6>
R7C7 can only be <2>
R8C1 can only be <9>


 

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