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Sudoku Solution Path

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R2C4 can only be <7>
R4C8 can only be <4>
R5C5 can only be <3>
R5C6 can only be <7>
R6C5 can only be <9>
R8C4 can only be <6>
R5C4 can only be <4>
R4C2 can only be <9>
R6C8 can only be <1>
R5C9 can only be <2>
R5C1 can only be <6>
R6C2 can only be <4>
R4C5 can only be <8>
R1C1 is the only square in row 1 that can be <3>
Squares R2C1 and R2C7 in row 2 and R8C1 and R8C7 in row 8 form a Simple X-Wing pattern on possibility <2>. All other instances of this possibility in columns 1 and 7 can be removed.
   R3C1 - removing <2> from <29> leaving <9>
   R9C1 - removing <2> from <1249> leaving <149>
   R9C7 - removing <2> from <245> leaving <45>
R2C9 is the only square in row 2 that can be <9>
R9C3 is the only square in row 9 that can be <9>
R1C3 is the only square in column 3 that can be <7>
Squares R1C2 and R1C5 in row 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 row.
   R1C7 - removing <5> from <458> leaving <48>
   R1C9 - removing <5> from <456> leaving <46>
Intersection of row 1 with block 3. The values <468> only appears in one or more of squares R1C7, R1C8 and R1C9 of row 1. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain these values.
   R2C7 - removing <8> from <258> leaving <25>
Squares R9C1<14>, R9C5<15> and R9C7<45> in row 9 form a comprehensive locked triplet. These 3 squares can only contain the 3 possibilities <145>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R9C2 - removing <15> from <1257> leaving <27>
   R9C9 - removing <145> from <14567> leaving <67>
Squares R3C2 and R3C9 in row 3 and R7C2 and R7C9 in row 7 form a Simple X-Wing pattern on possibility <5>. All other instances of this possibility in columns 2 and 9 can be removed.
   R1C2 - removing <5> from <15> leaving <1>
   R8C9 - removing <5> from <145> leaving <14>
R1C5 can only be <5>
R9C5 can only be <1>
R2C6 can only be <1>
R8C6 can only be <5>
R8C3 can only be <8>
R9C1 can only be <4>
R2C3 can only be <5>
R7C1 can only be <1>
R9C7 can only be <5>
R2C7 can only be <2>
R3C2 can only be <2>
R2C1 can only be <8>
R8C7 can only be <4>
R3C8 can only be <7>
R9C2 can only be <7>
R3C9 can only be <5>
R7C8 can only be <8>
R7C9 can only be <7>
R8C1 can only be <2>
R1C8 can only be <6>
R7C2 can only be <5>
R9C9 can only be <6>
R8C9 can only be <1>
R1C7 can only be <8>
R9C8 can only be <2>
R1C9 can only be <4>


 

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