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Common Answers

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Sudoku Solution Path

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R9C9 can only be <2>
R2C2 is the only square in row 2 that can be <1>
R1C4 is the only square in row 1 that can be <1>
R1C6 is the only square in row 1 that can be <4>
R1C1 is the only square in row 1 that can be <6>
R3C7 is the only square in row 3 that can be <2>
R5C5 is the only square in row 5 that can be <2>
R8C9 is the only square in row 8 that can be <1>
R4C7 is the only square in row 4 that can be <1>
R7C3 is the only square in row 7 that can be <1>
R7C5 is the only square in row 7 that can be <8>
R9C1 is the only square in row 9 that can be <8>
R3C5 is the only square in column 5 that can be <6>
R7C7 is the only square in column 7 that can be <7>
R7C6 can only be <3>
R9C8 can only be <4>
R8C8 can only be <3>
R7C4 can only be <4>
R3C4 is the only square in row 3 that can be <3>
Squares R5C4 and R5C6 in row 5 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.
   R5C2 - removing <5> from <345> leaving <34>
   R5C3 - removing <5> from <589> leaving <89>
Squares R2C5 and R8C5 in column 5 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.
   R4C5 - removing <5> from <345> leaving <34>
   R6C5 - removing <5> from <345> leaving <34>
Squares R6C5 and R6C7 in row 6 form a simple locked pair. These 2 squares both contain the 2 possibilities <34>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R6C1 - removing <34> from <3457> leaving <57>
   R6C9 - removing <3> from <358> leaving <58>
Squares R5C7 and R6C7 in block 6 form a simple locked pair. These 2 squares both contain the 2 possibilities <34>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R4C9 - removing <3> from <359> leaving <59>
Squares R4C3 and R4C9 in row 4 form a simple locked pair. These 2 squares both contain the 2 possibilities <59>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R4C1 - removing <5> from <345> leaving <34>
Intersection of column 2 with block 7. The value <5> only appears in one or more of squares R7C2, R8C2 and R9C2 of column 2. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.
   R8C1 - removing <5> from <457> leaving <47>
Squares R5C4, R5C6, R9C4 and R9C6 form a Type-1 Unique Rectangle on <56>.
   R9C6 - removing <56> from <567> leaving <7>
R9C2 can only be <5>
R3C6 can only be <5>
R8C5 can only be <5>
R3C3 can only be <7>
R5C6 can only be <6>
R2C5 can only be <7>
R5C4 can only be <5>
R9C4 can only be <6>
R2C8 can only be <9>
R2C9 can only be <3>
R5C8 can only be <8>
R2C1 can only be <5>
R1C9 can only be <8>
R1C2 can only be <3>
R5C3 can only be <9>
R1C8 can only be <7>
R6C9 can only be <5>
R6C1 can only be <7>
R6C3 can only be <8>
R4C9 can only be <9>
R5C2 can only be <4>
R4C3 can only be <5>
R5C7 can only be <3>
R8C2 can only be <7>
R4C1 can only be <3>
R6C7 can only be <4>
R8C1 can only be <4>
R6C5 can only be <3>
R4C5 can only be <4>


 

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