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Sudoku Solution Path

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R1C9 can only be <8>
R9C1 can only be <4>
R3C7 can only be <1>
R7C3 can only be <5>
R3C3 can only be <6>
R1C5 is the only square in row 1 that can be <6>
R1C3 is the only square in row 1 that can be <7>
R2C5 is the only square in row 2 that can be <7>
R4C9 is the only square in row 4 that can be <5>
R5C9 can only be <2>
R7C9 can only be <9>
R9C9 can only be <7>
R8C9 can only be <6>
R4C8 is the only square in row 4 that can be <9>
R6C4 is the only square in row 6 that can be <6>
R6C7 is the only square in row 6 that can be <7>
R8C5 is the only square in row 8 that can be <9>
R8C4 is the only square in column 4 that can be <5>
R8C8 is the only square in column 8 that can be <1>
Squares R1C1 and R5C1 in column 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <15>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R2C1 - removing <1> from <1289> leaving <289>
   R3C1 - removing <5> from <258> leaving <28>
Intersection of row 4 with block 5. The value <2> only appears in one or more of squares R4C4, R4C5 and R4C6 of row 4. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain this value.
   R6C6 - removing <2> from <234> leaving <34>
Squares R6C3 and R6C6 in row 6 form a simple locked pair. These 2 squares both contain the 2 possibilities <34>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R6C2 - removing <4> from <249> leaving <29>
Squares R5C5 and R7C5 in column 5 and R5C8 and R7C8 in column 8 form a Simple X-Wing pattern on possibility <4>. All other instances of this possibility in rows 5 and 7 can be removed.
   R5C2 - removing <4> from <45> leaving <5>
   R7C7 - removing <4> from <2348> leaving <238>
R5C1 can only be <1>
R3C2 can only be <2>
R3C1 can only be <8>
R3C5 can only be <3>
R6C2 can only be <9>
R5C5 can only be <4>
R1C1 can only be <5>
R5C8 can only be <3>
R7C5 can only be <2>
R6C6 can only be <3>
R7C8 can only be <4>
R4C7 can only be <4>
R6C1 can only be <2>
R2C2 can only be <4>
R6C3 can only be <4>
R9C5 can only be <1>
R8C7 can only be <8>
R8C6 can only be <4>
R7C7 can only be <3>
R9C4 can only be <3>
R1C6 can only be <1>
R4C6 can only be <2>
R2C3 can only be <1>
R3C6 can only be <5>
R2C1 can only be <9>
R4C4 can only be <1>
R2C6 can only be <8>
R4C3 can only be <3>
R7C4 can only be <8>
R9C7 can only be <2>
R2C4 can only be <2>


 

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