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Sudoku Solution Path

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R5C3 can only be <2>
R7C5 can only be <8>
R7C8 can only be <6>
R9C5 can only be <4>
R7C2 can only be <7>
R1C5 can only be <5>
R8C6 can only be <2>
R3C5 can only be <9>
R8C4 can only be <3>
R1C2 is the only square in row 1 that can be <4>
R2C9 is the only square in row 2 that can be <6>
R2C8 is the only square in row 2 that can be <7>
R4C4 is the only square in row 4 that can be <9>
R5C5 is the only square in row 5 that can be <6>
R5C1 is the only square in row 5 that can be <3>
R2C2 is the only square in row 2 that can be <3>
R6C4 is the only square in row 6 that can be <2>
R6C6 is the only square in row 6 that can be <7>
R5C9 is the only square in row 5 that can be <7>
R8C8 is the only square in row 8 that can be <4>
R8C2 is the only square in row 8 that can be <6>
R9C8 is the only square in column 8 that can be <9>
Squares R2C4 and R2C6 in row 2 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.
   R2C7 - removing <8> from <158> leaving <15>
Squares R4C2 and R6C2 in column 2 form a simple locked pair. These 2 squares both contain the 2 possibilities <18>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R9C2 - removing <8> from <258> leaving <25>
Intersection of column 9 with block 9. The value <5> only appears in one or more of squares R7C9, R8C9 and R9C9 of column 9. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.
   R8C7 - removing <5> from <158> leaving <18>
Squares R2C4, R2C6, R5C4 and R5C6 form a Type-1 Unique Rectangle on <48>.
   R5C6 - removing <48> from <458> leaving <5>
R5C7 can only be <8>
R4C6 can only be <8>
R5C4 can only be <4>
R8C7 can only be <1>
R6C8 can only be <3>
R6C5 can only be <1>
R4C8 can only be <5>
R2C7 can only be <5>
R2C3 can only be <9>
R3C8 can only be <2>
R3C2 can only be <5>
R1C8 can only be <8>
R4C2 can only be <1>
R2C6 can only be <4>
R2C4 can only be <8>
R6C2 can only be <8>
R4C5 can only be <3>
R1C9 can only be <1>
R1C1 can only be <2>
R2C1 can only be <1>
R8C3 can only be <5>
R9C2 can only be <2>
R8C9 can only be <8>
R8C1 can only be <9>
R9C9 can only be <5>
R9C1 can only be <8>


 

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