     Sudoku Solution Path   Copyright © Kevin Stone 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>    