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Sudoku Solution Path

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R2C5 can only be <3>
R9C6 can only be <3>
R4C5 can only be <7>
R5C5 can only be <4>
R8C5 can only be <5>
R6C5 can only be <8>
R9C4 can only be <7>
R2C2 is the only square in row 2 that can be <6>
R6C6 is the only square in row 6 that can be <5>
R6C4 is the only square in row 6 that can be <9>
R1C4 can only be <6>
R1C6 can only be <9>
R8C8 is the only square in row 8 that can be <7>
Squares R3C2 and R7C2 in column 2 form a simple locked pair. These 2 squares both contain the 2 possibilities <38>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R5C2 - removing <3> from <123> leaving <12>
   R8C2 - removing <3> from <123> leaving <12>
Intersection of block 4 with column 1. The value <3> only appears in one or more of squares R4C1, R5C1 and R6C1 of block 4. These squares are the ones that intersect with column 1. Thus, the other (non-intersecting) squares of column 1 cannot contain this value.
   R1C1 - removing <3> from <2348> leaving <248>
   R3C1 - removing <3> from <3489> leaving <489>
   R7C1 - removing <3> from <348> leaving <48>
Squares R1C3 and R8C3 in column 3 and R1C7 and R8C7 in column 7 form a Simple X-Wing pattern on possibility <3>. All other instances of this possibility in rows 1 and 8 can be removed.
   R1C9 - removing <3> from <2348> leaving <248>
Squares R3C1 and R3C9 in row 3 and R7C1 and R7C9 in row 7 form a Simple X-Wing pattern on possibility <4>. All other instances of this possibility in columns 1 and 9 can be removed.
   R1C1 - removing <4> from <248> leaving <28>
   R1C9 - removing <4> from <248> leaving <28>
   R9C1 - removing <4> from <1249> leaving <129>
   R9C9 - removing <4> from <124> leaving <12>
Squares R1C1 and R1C9 in row 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <28>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R1C3 - removing <2> from <234> leaving <34>
   R1C7 - removing <2> from <234> leaving <34>
Squares R3C9 (XYZ), R3C2 (XZ) and R1C7 (YZ) form an XYZ-Wing pattern on <3>. All squares that are buddies of all three squares cannot be <3>.
   R3C8 - removing <3> from <39> leaving <9>
R2C8 can only be <1>
R2C7 can only be <2>
R2C3 can only be <9>
R1C9 can only be <8>
R1C1 can only be <2>
R4C6 is the only square in row 4 that can be <2>
R5C6 can only be <6>
R5C8 can only be <3>
R5C4 can only be <1>
R7C8 can only be <6>
R6C9 can only be <1>
R6C1 can only be <3>
R4C9 can only be <6>
R9C9 can only be <2>
R9C3 can only be <4>
R5C2 can only be <2>
R4C4 can only be <3>
R4C1 can only be <1>
R9C7 can only be <1>
R1C3 can only be <3>
R7C1 can only be <8>
R9C1 can only be <9>
R8C7 can only be <3>
R1C7 can only be <4>
R8C3 can only be <2>
R3C2 can only be <8>
R3C9 can only be <3>
R3C1 can only be <4>
R7C2 can only be <3>
R7C9 can only be <4>
R8C2 can only be <1>


 

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