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Common Answers

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Sudoku Solution Path

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R2C8 is the only square in row 2 that can be <8>
R2C4 is the only square in row 2 that can be <9>
R4C8 is the only square in row 4 that can be <2>
R5C4 is the only square in row 5 that can be <7>
R5C7 is the only square in row 5 that can be <9>
R9C7 can only be <5>
R9C5 can only be <4>
R9C8 can only be <9>
R4C6 is the only square in row 4 that can be <4>
R4C5 is the only square in row 4 that can be <3>
R6C5 is the only square in row 6 that can be <9>
R8C2 is the only square in row 8 that can be <9>
R7C5 is the only square in column 5 that can be <8>
R8C3 is the only square in row 8 that can be <8>
R5C6 is the only square in row 5 that can be <8>
R5C1 is the only square in row 5 that can be <5>
R6C2 is the only square in row 6 that can be <8>
R8C9 is the only square in row 8 that can be <3>
R2C3 is the only square in column 3 that can be <4>
R2C6 is the only square in column 6 that can be <3>
R2C2 is the only square in row 2 that can be <5>
Squares R8C4 and R8C6 in row 8 form a simple locked pair. These 2 squares both contain the 2 possibilities <56>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R8C7 - removing <6> from <267> leaving <27>
   R8C8 - removing <6> from <467> leaving <47>
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.
   R1C7 - removing <6> from <267> leaving <27>
   R1C8 - removing <6> from <567> leaving <57>
   R3C8 - removing <6> from <14567> leaving <1457>
   R3C9 - removing <6> from <146> leaving <14>
R2C7 is the only square in column 7 that can be <6>
Intersection of column 1 with block 1. The value <1> only appears in one or more of squares R1C1, R2C1 and R3C1 of column 1. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.
   R3C2 - removing <1> from <167> leaving <67>
Squares R8C4, R8C6, R6C4 and R6C6 form a Type-1 Unique Rectangle on <56>.
   R6C4 - removing <56> from <156> leaving <1>
R6C8 can only be <6>
R4C4 can only be <6>
R6C6 can only be <5>
R5C9 can only be <1>
R4C2 can only be <1>
R8C4 can only be <5>
R5C3 can only be <6>
R2C9 can only be <2>
R3C9 can only be <4>
R8C6 can only be <6>
R2C1 can only be <1>
R1C7 can only be <7>
R7C9 can only be <6>
R9C2 can only be <3>
R1C3 can only be <3>
R9C3 can only be <1>
R1C8 can only be <5>
R8C7 can only be <2>
R1C5 can only be <6>
R3C8 can only be <1>
R3C1 can only be <7>
R3C2 can only be <6>
R3C5 can only be <5>
R1C2 can only be <2>
R8C1 can only be <4>
R7C2 can only be <7>
R7C8 can only be <4>
R7C1 can only be <2>
R8C8 can only be <7>


 

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