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 Sudoku Solution Path   R3C3 can only be <2> R4C4 can only be <1> R4C6 can only be <2> R5C1 can only be <9> R5C9 can only be <6> R6C4 can only be <8> R6C6 can only be <9> R9C5 can only be <8> R5C4 can only be <5> R4C5 can only be <3> R5C2 can only be <3> R5C6 can only be <4> R5C5 can only be <7> R5C8 can only be <1> R6C5 can only be <6> R8C5 can only be <1> R2C2 is the only square in row 2 that can be <1> Squares R1C1 and R1C8 in row 1 and R9C1 and R9C8 in row 9 form a Simple X-Wing pattern on possibility <6>. All other instances of this possibility in columns 1 and 8 can be removed.    R2C1 - removing <6> from <468> leaving <48>    R2C8 - removing <6> from <23689> leaving <2389>    R8C1 - removing <6> from <468> leaving <48>    R8C8 - removing <6> from <35689> leaving <3589> Squares R2C1 and R8C1 in column 1 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 column.    R1C1 - removing <4> from <467> leaving <67> Squares R3C2 and R3C7 in row 3 and R7C2 and R7C7 in row 7 form a Simple X-Wing pattern on possibility <7>. All other instances of this possibility in columns 2 and 7 can be removed.    R1C2 - removing <7> from <479> leaving <49>    R9C2 - removing <7> from <57> leaving <5> Squares R3C7 (XYZ), R3C8 (XZ) and R7C7 (YZ) form an XYZ-Wing pattern on <8>. All squares that are buddies of all three squares cannot be <8>.    R2C7 - removing <8> from <68> leaving <6> R2C3 can only be <9> R7C3 can only be <3> R1C2 can only be <4> R8C3 can only be <6> R9C1 can only be <7> R9C9 can only be <2> R1C1 can only be <6> R9C8 can only be <6> R2C9 can only be <3> R1C5 can only be <2> R2C1 can only be <8> R1C8 can only be <9> R2C5 can only be <4> R1C9 can only be <7> R7C8 can only be <8> R8C1 can only be <4> R3C2 can only be <7> R2C8 can only be <2> R8C9 can only be <9> R7C2 can only be <9> R7C7 can only be <7> R3C8 can only be <5> R8C7 can only be <5> R8C8 can only be <3> R3C7 can only be <8> R8C2 can only be <8>

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