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Common Answers

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Sudoku Solution Path

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R1C7 can only be <8>
R9C3 can only be <8>
R4C3 can only be <9>
R7C3 can only be <5>
R3C3 can only be <4>
R1C6 is the only square in row 1 that can be <4>
R4C4 is the only square in row 4 that can be <7>
R4C6 is the only square in row 4 that can be <1>
R5C8 is the only square in row 5 that can be <9>
R8C6 is the only square in row 8 that can be <5>
R9C8 is the only square in row 9 that can be <4>
Squares R1C8 and R2C8 in column 8 form a simple locked pair. These 2 squares both contain the 2 possibilities <57>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R6C8 - removing <5> from <3568> leaving <368>
   R7C8 - removing <7> from <1378> leaving <138>
   R8C8 - removing <7> from <1367> leaving <136>
R5C9 is the only square in block 6 that can be <5>
R6C7 is the only square in block 6 that can be <2>
R7C7 can only be <3>
R3C7 can only be <6>
R3C9 can only be <3>
Intersection of row 4 with block 6. The value <6> only appears in one or more of squares R4C7, R4C8 and R4C9 of row 4. These squares are the ones that intersect with block 6. Thus, the other (non-intersecting) squares of block 6 cannot contain this value.
   R6C8 - removing <6> from <368> leaving <38>
Squares R6C6 and R6C8 in row 6 form a simple locked pair. These 2 squares both contain the 2 possibilities <38>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R6C1 - removing <38> from <3568> leaving <56>
   R6C2 - removing <38> from <3458> leaving <45>
R5C1 is the only square in column 1 that can be <3>
R4C2 can only be <8>
R4C9 can only be <6>
R5C2 can only be <4>
R4C8 can only be <3>
R8C9 can only be <7>
R9C9 can only be <2>
R6C2 can only be <5>
R6C1 can only be <6>
R7C9 can only be <8>
R6C8 can only be <8>
R6C4 can only be <4>
R6C6 can only be <3>
R7C8 can only be <1>
R7C1 can only be <7>
R8C8 can only be <6>
Squares R8C2 and R9C2 in column 2 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.
   R1C2 - removing <1> from <127> leaving <27>
   R3C2 - removing <1> from <19> leaving <9>
R3C6 can only be <8>
R5C6 can only be <2>
R2C5 can only be <2>
R5C4 can only be <6>
R7C6 can only be <9>
R7C4 can only be <2>
R2C2 can only be <7>
R1C5 can only be <1>
R5C5 can only be <8>
R9C4 can only be <1>
R9C2 can only be <3>
R3C4 can only be <5>
R8C5 can only be <3>
R1C1 can only be <5>
R2C8 can only be <5>
R1C2 can only be <2>
R2C1 can only be <8>
R2C4 can only be <9>
R1C8 can only be <7>
R3C1 can only be <1>
R8C2 can only be <1>
R9C5 can only be <6>


 

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