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Common Answers

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Sudoku Solution Path

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R6C3 can only be <8>
R5C1 can only be <5>
R7C7 is the only square in row 7 that can be <5>
R1C5 is the only square in block 2 that can be <9>
R9C5 is the only square in block 8 that can be <1>
Squares R6C5 and R6C7 in row 6 form a simple locked pair. These 2 squares both contain the 2 possibilities <24>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R6C6 - removing <2> from <259> leaving <59>
Squares R4C3 and R5C3 in column 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <13>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R2C3 - removing <1> from <149> leaving <49>
   R3C3 - removing <1> from <1247> leaving <247>
   R7C3 - removing <3> from <2349> leaving <249>
   R8C3 - removing <3> from <2379> leaving <279>
Intersection of row 2 with block 3. The value <6> 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.
   R3C7 - removing <6> from <124678> leaving <12478>
   R3C8 - removing <6> from <24678> leaving <2478>
R2C7 is the only square in column 7 that can be <6>
Squares R2C1 and R2C8 in row 2 form a simple locked pair. These 2 squares both contain the 2 possibilities <48>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R2C2 - removing <8> from <1589> leaving <159>
   R2C3 - removing <4> from <49> leaving <9>
   R2C9 - removing <48> from <1458> leaving <15>
R8C2 is the only square in row 8 that can be <9>
R8C8 is the only square in row 8 that can be <3>
R7C2 is the only square in row 7 that can be <3>
R7C8 is the only square in row 7 that can be <6>
R7C3 is the only square in row 7 that can be <4>
R9C2 is the only square in row 9 that can be <6>
R2C1 is the only square in column 1 that can be <4>
R2C8 can only be <8>
R9C9 is the only square in column 9 that can be <4>
R9C8 can only be <2>
R9C1 can only be <8>
R1C8 can only be <7>
R3C8 can only be <4>
R1C1 can only be <2>
R1C9 can only be <5>
R8C1 can only be <7>
R3C3 can only be <7>
R1C2 can only be <8>
R2C9 can only be <1>
R2C2 can only be <5>
R8C9 can only be <8>
R3C7 can only be <2>
R8C3 can only be <2>
R6C7 can only be <4>
R6C5 can only be <2>
R8C7 can only be <1>
R5C9 can only be <2>
R3C2 can only be <1>
R7C5 can only be <8>
R7C4 can only be <9>
R3C5 can only be <6>
R5C5 can only be <3>
R5C3 can only be <1>
R4C5 can only be <4>
R7C6 can only be <2>
R6C4 can only be <5>
R5C6 can only be <8>
R4C3 can only be <3>
R5C7 can only be <7>
R3C6 can only be <5>
R4C6 can only be <1>
R4C4 can only be <7>
R5C4 can only be <6>
R4C7 can only be <8>
R6C6 can only be <9>
R3C4 can only be <8>


 

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