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Sudoku Solution Path

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R1C4 can only be <8>
R2C3 can only be <3>
R2C7 can only be <8>
R3C5 can only be <9>
R7C5 can only be <8>
R2C1 can only be <9>
R2C9 can only be <4>
R3C4 can only be <4>
R5C5 can only be <5>
R5C3 can only be <2>
R5C7 can only be <9>
R3C6 can only be <1>
R1C6 can only be <3>
R4C9 is the only square in row 4 that can be <8>
R4C7 is the only square in row 4 that can be <1>
R1C8 is the only square in row 1 that can be <1>
R6C1 is the only square in row 6 that can be <3>
R7C9 is the only square in row 7 that can be <1>
R7C2 is the only square in row 7 that can be <3>
R8C1 is the only square in row 8 that can be <8>
R9C3 is the only square in row 9 that can be <1>
R9C8 is the only square in row 9 that can be <8>
Squares R6C7 and R6C9 in row 6 form a simple locked pair. These 2 squares both contain the 2 possibilities <56>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R6C3 - removing <5> from <457> leaving <47>
Squares R3C1 and R7C1 in column 1 and R3C8 and R7C8 in column 8 form a Simple X-Wing pattern on possibility <6>. All other instances of this possibility in rows 3 and 7 can be removed.
   R7C4 - removing <6> from <267> leaving <27>
   R3C9 - removing <6> from <256> leaving <25>
R9C4 is the only square in column 4 that can be <6>
R9C6 is the only square in row 9 that can be <9>
R6C4 is the only square in row 6 that can be <9>
Squares R7C4 and R7C6 in row 7 form a simple locked pair. These 2 squares both contain the 2 possibilities <27>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R7C1 - removing <7> from <567> leaving <56>
Squares R6C3, R6C6, R4C3 and R4C6 form a Type-4 Unique Rectangle on <47>.
   R4C3 - removing <7> from <457> leaving <45>
   R4C6 - removing <7> from <247> leaving <24>
Squares R3C9 (XY), R8C9 (XZ) and R3C8 (YZ) form an XY-Wing pattern on <6>. All squares that are buddies of both the XZ and YZ squares cannot be <6>.
   R7C8 - removing <6> from <56> leaving <5>
R7C1 can only be <6>
R3C8 can only be <6>
R9C7 can only be <7>
R9C2 can only be <5>
R8C3 can only be <7>
R6C3 can only be <4>
R1C2 can only be <2>
R1C7 can only be <5>
R3C2 can only be <7>
R1C3 can only be <6>
R6C7 can only be <6>
R3C9 can only be <2>
R3C1 can only be <5>
R8C9 can only be <6>
R6C6 can only be <7>
R4C3 can only be <5>
R7C6 can only be <2>
R4C4 can only be <2>
R6C9 can only be <5>
R8C7 can only be <2>
R7C4 can only be <7>
R4C6 can only be <4>
R4C1 can only be <7>


 

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