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Common Answers

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Sudoku Solution Path

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R3C7 is the only square in row 3 that can be <2>
R1C5 is the only square in row 1 that can be <2>
R6C3 is the only square in row 6 that can be <4>
R1C1 is the only square in row 1 that can be <4>
R8C7 is the only square in row 8 that can be <5>
R2C3 is the only square in row 2 that can be <5>
R1C9 is the only square in row 1 that can be <5>
R4C8 is the only square in row 4 that can be <5>
R5C1 is the only square in row 5 that can be <5>
R9C1 is the only square in row 9 that can be <2>
R9C9 is the only square in row 9 that can be <4>
R4C3 is the only square in column 3 that can be <3>
R1C6 is the only square in block 2 that can be <9>
Intersection of row 3 with block 1. The values <69> only appears in one or more of squares R3C1, R3C2 and R3C3 of row 3. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain these values.
   R1C3 - removing <6> from <167> leaving <17>
Intersection of row 7 with block 7. The values <67> only appears in one or more of squares R7C1, R7C2 and R7C3 of row 7. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain these values.
   R9C3 - removing <7> from <1789> leaving <189>
Intersection of row 7 with block 9. The value <3> only appears in one or more of squares R7C7, R7C8 and R7C9 of row 7. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.
   R9C7 - removing <3> from <1389> leaving <189>
Intersection of column 3 with block 7. The value <8> 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.
   R7C2 - removing <8> from <16789> leaving <1679>
Intersection of block 4 with column 2. The values <689> only appears in one or more of squares R4C2, R5C2 and R6C2 of block 4. These squares are the ones that intersect with column 2. Thus, the other (non-intersecting) squares of column 2 cannot contain these values.
   R3C2 - removing <69> from <1679> leaving <17>
   R7C2 - removing <69> from <1679> leaving <17>
Squares R1C3 and R3C2 in block 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <17>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R3C3 - removing <17> from <1679> leaving <69>
Squares R2C5 and R2C7 in row 2 and R4C5 and R4C7 in row 4 form a Simple X-Wing pattern on possibility <1>. All other instances of this possibility in columns 5 and 7 can be removed.
   R1C7 - removing <1> from <167> leaving <67>
   R5C5 - removing <1> from <13679> leaving <3679>
   R7C7 - removing <1> from <1389> leaving <389>
   R8C5 - removing <1> from <18> leaving <8>
   R9C5 - removing <1> from <1378> leaving <378>
   R9C7 - removing <1> from <189> leaving <89>
R8C3 can only be <1>
R1C3 can only be <7>
R7C2 can only be <7>
R1C7 can only be <6>
R3C2 can only be <1>
R1C4 can only be <1>
R2C7 can only be <1>
R2C5 can only be <6>
R4C7 can only be <9>
R3C9 can only be <3>
R3C8 can only be <7>
R4C2 can only be <6>
R9C7 can only be <8>
R9C3 can only be <9>
R7C7 can only be <3>
R7C9 can only be <1>
R9C4 can only be <7>
R4C5 can only be <1>
R6C8 can only be <3>
R5C6 can only be <3>
R5C8 can only be <1>
R9C6 can only be <1>
R5C9 can only be <8>
R5C2 can only be <9>
R6C7 can only be <7>
R7C8 can only be <9>
R7C1 can only be <6>
R3C3 can only be <6>
R9C5 can only be <3>
R5C4 can only be <6>
R3C1 can only be <9>
R7C3 can only be <8>
R5C5 can only be <7>
R6C2 can only be <8>
R6C5 can only be <9>


 

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