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Sudoku Solution Path

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R3C6 can only be <2>
R4C4 can only be <5>
R4C6 can only be <9>
R5C5 can only be <4>
R5C9 can only be <6>
R9C5 can only be <7>
R6C6 can only be <1>
R3C4 can only be <7>
R5C1 can only be <2>
R4C7 can only be <7>
R6C4 can only be <2>
R7C6 can only be <3>
R9C9 can only be <2>
R1C5 can only be <5>
R7C4 can only be <1>
R9C1 can only be <4>
R4C3 can only be <6>
R6C7 can only be <3>
R8C7 can only be <1>
R6C3 can only be <7>
R9C7 can only be <8>
R9C3 can only be <1>
R3C1 is the only square in row 3 that can be <6>
R3C8 is the only square in row 3 that can be <8>
R7C7 is the only square in row 7 that can be <6>
R7C8 is the only square in row 7 that can be <4>
R7C3 is the only square in row 7 that can be <8>
Squares R2C2 and R2C8 in row 2 and R8C2 and R8C8 in row 8 form a Simple X-Wing pattern on possibility <7>. All other instances of this possibility in columns 2 and 8 can be removed.
   R7C2 - removing <7> from <579> leaving <59>
Squares R3C2 and R7C2 in column 2 form a simple locked pair. These 2 squares both contain the 2 possibilities <59>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R2C2 - removing <5> from <257> leaving <27>
   R8C2 - removing <5> from <257> leaving <27>
Squares R2C3 and R2C8 in row 2 and R8C3 and R8C8 in row 8 form a Simple X-Wing pattern on possibility <5>. All other instances of this possibility in columns 3 and 8 can be removed.
   R3C3 - removing <5> from <345> leaving <34>
Squares R1C1 (XY), R2C2 (XZ) and R1C7 (YZ) form an XY-Wing pattern on <2>. All squares that are buddies of both the XZ and YZ squares cannot be <2>.
   R1C3 - removing <2> from <23> leaving <3>
   R2C7 - removing <2> from <24> leaving <4>
R1C9 can only be <7>
R3C3 can only be <4>
R1C1 can only be <9>
R7C9 can only be <5>
R2C8 can only be <5>
R3C7 can only be <9>
R2C3 can only be <2>
R8C8 can only be <7>
R3C9 can only be <3>
R3C2 can only be <5>
R1C7 can only be <2>
R7C2 can only be <9>
R8C2 can only be <2>
R7C1 can only be <7>
R2C2 can only be <7>
R8C3 can only be <5>

 

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