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Common Answers

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Sudoku Solution Path

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R1C9 is the only square in row 1 that can be <5>
R1C8 is the only square in row 1 that can be <3>
R2C5 is the only square in row 2 that can be <3>
R2C6 is the only square in row 2 that can be <6>
R4C4 is the only square in row 4 that can be <4>
R4C3 is the only square in row 4 that can be <9>
R5C4 is the only square in column 4 that can be <8>
R4C7 is the only square in column 7 that can be <3>
R6C7 is the only square in column 7 that can be <5>
R2C8 is the only square in column 8 that can be <9>
R2C9 is the only square in column 9 that can be <8>
Squares R2C1 and R2C4 in row 2 form a simple locked pair. These 2 squares both contain the 2 possibilities <12>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R2C2 - removing <2> from <247> leaving <47>
   R2C7 - removing <1> from <147> leaving <47>
Intersection of column 4 with block 8. The value <7> only appears in one or more of squares R7C4, R8C4 and R9C4 of column 4. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain this value.
   R8C6 - removing <7> from <24579> leaving <2459>
   R9C6 - removing <7> from <2579> leaving <259>
Intersection of column 7 with block 3. The value <7> only appears in one or more of squares R1C7, R2C7 and R3C7 of column 7. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.
   R3C8 - removing <7> from <147> leaving <14>
Intersection of block 3 with row 3. The value <1> only appears in one or more of squares R3C7, R3C8 and R3C9 of block 3. These squares are the ones that intersect with row 3. Thus, the other (non-intersecting) squares of row 3 cannot contain this value.
   R3C3 - removing <1> from <127> leaving <27>
   R3C5 - removing <1> from <124> leaving <24>
Intersection of column 3 with block 7. The value <1> only appears in one or more of squares R7C3, R8C3 and R9C3 of column 3. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.
   R8C1 - removing <1> from <1269> leaving <269>
   R9C1 - removing <1> from <129> leaving <29>
Intersection of column 5 with block 8. The value <1> only appears in one or more of squares R7C5, R8C5 and R9C5 of column 5. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain this value.
   R8C4 - removing <1> from <1279> leaving <279>
   R9C4 - removing <1> from <1279> leaving <279>
R9C8 is the only square in row 9 that can be <1>
R3C8 can only be <4>
R7C7 can only be <4>
R3C5 can only be <2>
R2C7 can only be <7>
R2C2 can only be <4>
R3C7 can only be <1>
R3C3 can only be <7>
R5C5 can only be <5>
R7C5 can only be <1>
R2C4 can only be <1>
R8C5 can only be <4>
R1C2 can only be <8>
R2C1 can only be <2>
R1C4 can only be <9>
R1C1 can only be <1>
R7C2 can only be <2>
R1C6 can only be <4>
R9C1 can only be <9>
R7C3 can only be <8>
R4C2 can only be <7>
R8C3 can only be <1>
R6C3 can only be <2>
R8C1 can only be <6>
R4C9 can only be <2>
R5C2 can only be <6>
R5C8 can only be <7>
R6C1 can only be <8>
R5C6 can only be <2>
R6C8 can only be <6>
R8C8 can only be <2>
R6C6 can only be <7>
R8C4 can only be <7>
R9C6 can only be <5>
R8C9 can only be <3>
R9C4 can only be <2>
R8C2 can only be <5>
R9C9 can only be <7>
R9C2 can only be <3>
R8C6 can only be <9>


 

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