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Sudoku Solution Path

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R7C9 can only be <6>
R1C3 is the only square in row 1 that can be <4>
R5C3 can only be <5>
R5C2 can only be <2>
R5C8 can only be <6>
R2C8 is the only square in row 2 that can be <1>
R3C6 is the only square in row 3 that can be <7>
R3C5 is the only square in row 3 that can be <2>
R8C5 can only be <5>
R6C6 is the only square in row 6 that can be <6>
R7C1 is the only square in row 7 that can be <5>
R3C2 is the only square in row 3 that can be <5>
R8C9 is the only square in row 8 that can be <4>
R8C2 is the only square in row 8 that can be <6>
R3C3 is the only square in column 3 that can be <9>
R3C9 can only be <8>
R6C9 can only be <1>
R4C9 can only be <9>
R5C7 can only be <4>
R5C5 can only be <9>
R2C5 can only be <4>
R7C5 can only be <1>
R4C2 is the only square in row 4 that can be <1>
R7C4 is the only square in row 7 that can be <9>
R9C3 is the only square in row 9 that can be <1>
R1C8 is the only square in column 8 that can be <5>
Intersection of row 7 with block 9. The value <2> only appears in one or more of squares R7C7, R7C8 and R7C9 of row 7. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.
   R8C8 - removing <2> from <238> leaving <38>
Intersection of column 8 with block 9. The value <3> only appears in one or more of squares R7C8, R8C8 and R9C8 of column 8. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.
   R7C7 - removing <3> from <237> leaving <27>
   R9C7 - removing <3> from <378> leaving <78>
Squares R6C3 and R8C3 in column 3 and R6C8 and R8C8 in column 8 form a Simple X-Wing pattern on possibility <8>. All other instances of this possibility in rows 6 and 8 can be removed.
   R6C1 - removing <8> from <348> leaving <34>
Squares R1C6, R1C7, R2C6 and R2C7 form a Type-4 Unique Rectangle on <39>.
   R2C6 - removing <3> from <359> leaving <59>
   R2C7 - removing <3> from <369> leaving <69>
Squares R6C8 (XY), R7C8 (XZ) and R6C3 (YZ) form an XY-Wing pattern on <3>. All squares that are buddies of both the XZ and YZ squares cannot be <3>.
   R7C3 - removing <3> from <37> leaving <7>
R7C7 can only be <2>
R7C8 can only be <3>
R4C7 can only be <8>
R8C8 can only be <8>
R8C3 can only be <3>
R6C8 can only be <2>
R9C7 can only be <7>
R9C4 can only be <3>
R4C1 can only be <4>
R6C4 can only be <4>
R8C6 can only be <2>
R6C3 can only be <8>
R9C2 can only be <8>
R8C4 can only be <7>
R4C6 can only be <5>
R2C2 can only be <3>
R2C4 can only be <5>
R3C1 can only be <6>
R2C6 can only be <9>
R2C7 can only be <6>
R1C6 can only be <3>
R2C1 can only be <8>
R3C7 can only be <3>
R1C7 can only be <9>
R4C4 can only be <2>
R6C1 can only be <3>


 

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