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Common Answers

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Sudoku Solution Path

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R8C2 can only be <8>
R8C3 can only be <9>
R8C8 can only be <3>
R8C4 can only be <1>
R9C1 is the only square in row 9 that can be <1>
R1C2 is the only square in column 2 that can be <4>
R9C3 is the only square in column 3 that can be <5>
R9C2 is the only square in row 9 that can be <2>
R7C2 is the only square in column 2 that can be <7>
R7C1 can only be <6>
R4C4 is the only square in row 4 that can be <6>
Intersection of row 2 with block 3. The value <5> only appears in one or more of squares R2C7, R2C8 and R2C9 of row 2. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.
   R1C7 - removing <5> from <1256> leaving <126>
   R1C8 - removing <5> from <259> leaving <29>
   R1C9 - removing <5> from <15679> leaving <1679>
Intersection of row 6 with block 4. The values <68> only appears in one or more of squares R6C1, R6C2 and R6C3 of row 6. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain these values.
   R4C1 - removing <8> from <378> leaving <37>
Squares R3C1<789>, R3C3<78> and R3C4<89> in row 3 form a comprehensive locked triplet. These 3 squares can only contain the 3 possibilities <789>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R3C5 - removing <9> from <129> leaving <12>
   R3C8 - removing <9> from <249> leaving <24>
   R3C9 - removing <79> from <1479> leaving <14>
R1C9 is the only square in column 9 that can be <7>
R9C9 is the only square in column 9 that can be <6>
R7C9 is the only square in column 9 that can be <9>
R7C5 can only be <4>
R7C6 can only be <8>
R7C7 can only be <5>
R2C7 can only be <6>
R2C2 can only be <3>
R2C6 can only be <9>
R6C2 can only be <6>
R2C8 can only be <5>
R3C4 can only be <8>
R3C3 can only be <7>
R3C1 can only be <9>
R5C3 can only be <2>
R5C7 can only be <4>
R6C3 can only be <8>
R5C6 can only be <7>
R9C7 can only be <8>
R6C1 can only be <3>
R1C3 can only be <6>
R9C8 can only be <4>
R3C8 can only be <2>
R1C1 can only be <8>
R3C5 can only be <1>
R1C8 can only be <9>
R4C8 can only be <8>
R1C7 can only be <1>
R5C4 can only be <9>
R9C6 can only be <3>
R6C4 can only be <5>
R4C1 can only be <7>
R6C9 can only be <1>
R1C4 can only be <3>
R6C5 can only be <2>
R3C9 can only be <4>
R4C9 can only be <5>
R4C7 can only be <2>
R9C5 can only be <9>
R1C6 can only be <2>
R4C5 can only be <3>
R4C6 can only be <1>
R9C4 can only be <7>
R6C6 can only be <4>
R1C5 can only be <5>


 

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