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Common Answers

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Sudoku Solution Path

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R2C8 can only be <2>
R6C4 can only be <6>
R6C6 can only be <1>
R3C4 can only be <5>
R4C4 can only be <8>
R6C3 can only be <3>
R4C6 can only be <7>
R7C6 can only be <6>
R1C5 can only be <7>
R7C4 can only be <9>
R5C5 can only be <5>
R3C6 can only be <4>
R6C7 can only be <4>
R2C5 can only be <6>
R2C2 can only be <7>
R3C9 is the only square in row 3 that can be <7>
R5C8 is the only square in row 5 that can be <3>
R3C7 is the only square in row 3 that can be <3>
R3C8 is the only square in row 3 that can be <1>
R7C8 can only be <8>
R8C8 can only be <4>
R7C2 is the only square in row 7 that can be <3>
R7C3 is the only square in row 7 that can be <7>
R1C7 is the only square in column 7 that can be <8>
Squares R3C1<28>, R5C1<18> and R7C1<12> in column 1 form a comprehensive locked triplet. These 3 squares can only contain the 3 possibilities <128>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R9C1 - removing <18> from <1489> leaving <49>
Squares R2C3 and R2C7 in row 2 and R8C3 and R8C7 in row 8 form a Simple X-Wing pattern on possibility <9>. All other instances of this possibility in columns 3 and 7 can be removed.
   R1C3 - removing <9> from <459> leaving <45>
   R9C3 - removing <9> from <1489> leaving <148>
   R9C7 - removing <9> from <169> leaving <16>
Squares R4C7 and R9C7 in column 7 form a simple locked pair. These 2 squares both contain the 2 possibilities <16>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R7C7 - removing <1> from <125> leaving <25>
   R8C7 - removing <1> from <129> leaving <29>
Squares R5C1 and R5C9 in row 5 and R7C1 and R7C9 in row 7 form a Simple X-Wing pattern on possibility <1>. All other instances of this possibility in columns 1 and 9 can be removed.
   R9C9 - removing <1> from <169> leaving <69>
Squares R4C3 (XY), R5C1 (XZ) and R3C3 (YZ) form an XY-Wing pattern on <8>. All squares that are buddies of both the XZ and YZ squares cannot be <8>.
   R3C1 - removing <8> from <28> leaving <2>
R7C1 can only be <1>
R7C9 can only be <5>
R5C1 can only be <8>
R7C7 can only be <2>
R1C9 can only be <9>
R1C1 can only be <4>
R9C9 can only be <6>
R2C7 can only be <5>
R2C3 can only be <9>
R5C2 can only be <6>
R5C9 can only be <1>
R3C2 can only be <8>
R4C3 can only be <1>
R4C7 can only be <6>
R8C7 can only be <9>
R8C3 can only be <8>
R9C7 can only be <1>
R1C3 can only be <5>
R9C1 can only be <9>
R3C3 can only be <6>
R8C2 can only be <2>
R8C5 can only be <1>
R9C3 can only be <4>
R9C5 can only be <8>


 

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