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Common Answers

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Sudoku Solution Path

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R5C4 can only be <1>
R5C6 can only be <8>
R6C6 can only be <9>
R4C6 can only be <4>
R3C6 can only be <6>
R6C7 is the only square in row 6 that can be <1>
R1C1 is the only square in column 1 that can be <4>
R2C1 is the only square in column 1 that can be <6>
R9C6 is the only square in column 6 that can be <2>
R4C7 is the only square in column 7 that can be <8>
R1C8 is the only square in column 8 that can be <7>
Squares R4C4 and R6C4 in column 4 form a simple locked pair. These 2 squares both contain the 2 possibilities <37>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R1C4 - removing <3> from <359> leaving <59>
   R3C4 - removing <3> from <349> leaving <49>
   R7C4 - removing <7> from <567> leaving <56>
   R9C4 - removing <7> from <45679> leaving <4569>
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 <2356> leaving <236>
   R1C9 - removing <5> from <2569> leaving <269>
Intersection of row 7 with block 8. The value <1> only appears in one or more of squares R7C4, R7C5 and R7C6 of row 7. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain this value.
   R8C5 - removing <1> from <149> leaving <49>
   R9C5 - removing <1> from <1479> leaving <479>
Intersection of column 7 with block 3. The value <2> 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.
   R1C9 - removing <2> from <269> leaving <69>
Intersection of column 7 with block 9. The value <5> only appears in one or more of squares R7C7, R8C7 and R9C7 of column 7. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.
   R8C8 - removing <5> from <125> leaving <12>
   R8C9 - removing <5> from <245> leaving <24>
   R9C8 - removing <5> from <135> leaving <13>
   R9C9 - removing <5> from <456> leaving <46>
R8C2 is the only square in row 8 that can be <5>
R5C2 can only be <2>
R5C8 can only be <5>
R2C8 can only be <3>
R6C9 can only be <7>
R6C4 can only be <3>
R4C9 can only be <2>
R9C8 can only be <1>
R3C7 can only be <2>
R1C7 can only be <6>
R8C9 can only be <4>
R6C1 can only be <8>
R4C4 can only be <7>
R8C5 can only be <9>
R9C9 can only be <6>
R8C8 can only be <2>
R1C9 can only be <9>
R1C4 can only be <5>
R2C9 can only be <5>
R6C3 can only be <5>
R8C1 can only be <1>
R2C5 can only be <8>
R1C6 can only be <1>
R7C4 can only be <6>
R9C4 can only be <4>
R7C6 can only be <5>
R2C2 can only be <9>
R1C5 can only be <3>
R7C7 can only be <3>
R7C3 can only be <7>
R9C7 can only be <5>
R9C5 can only be <7>
R3C4 can only be <9>
R7C5 can only be <1>
R1C2 can only be <8>
R3C5 can only be <4>
R3C3 can only be <3>
R4C3 can only be <9>
R4C1 can only be <3>
R9C3 can only be <8>
R9C2 can only be <3>
R1C3 can only be <2>
R9C1 can only be <9>


 

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