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Common Answers

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Sudoku Solution Path

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R2C5 can only be <2>
R2C4 can only be <9>
R2C6 can only be <3>
R2C7 can only be <4>
R2C2 can only be <1>
R3C8 is the only square in row 3 that can be <2>
R5C8 is the only square in row 5 that can be <1>
R7C6 is the only square in row 7 that can be <1>
R7C2 is the only square in row 7 that can be <9>
R1C1 is the only square in row 1 that can be <9>
R5C3 is the only square in row 5 that can be <9>
R6C8 is the only square in row 6 that can be <9>
R9C3 is the only square in row 9 that can be <1>
R8C5 is the only square in column 5 that can be <4>
R7C7 is the only square in column 7 that can be <7>
R8C3 is the only square in block 7 that can be <8>
R6C2 is the only square in row 6 that can be <8>
R6C3 is the only square in row 6 that can be <4>
R3C2 is the only square in row 3 that can be <4>
Squares R9C1 and R9C2 in row 9 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 row.
   R9C6 - removing <57> from <2567> leaving <26>
   R9C8 - removing <5> from <456> leaving <46>
   R9C9 - removing <5> from <245> leaving <24>
Intersection of row 3 with block 2. The values <58> only appears in one or more of squares R3C4, R3C5 and R3C6 of row 3. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain these values.
   R1C4 - removing <58> from <5678> leaving <67>
Intersection of row 5 with block 4. The value <7> only appears in one or more of squares R5C1, R5C2 and R5C3 of row 5. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain this value.
   R4C2 - removing <7> from <2567> leaving <256>
   R4C3 - removing <7> from <37> leaving <3>
R3C3 can only be <7>
R1C2 can only be <6>
R1C4 can only be <7>
R3C1 can only be <3>
R4C5 is the only square in row 4 that can be <7>
R6C7 is the only square in row 6 that can be <3>
R1C7 can only be <5>
R6C6 is the only square in row 6 that can be <2>
R9C6 can only be <6>
R9C8 can only be <4>
R3C6 can only be <5>
R8C4 can only be <5>
R9C9 can only be <2>
R5C9 can only be <5>
R8C6 can only be <7>
R7C9 can only be <3>
R7C8 can only be <5>
R1C9 can only be <8>
R8C8 can only be <6>
R4C4 can only be <6>
R7C5 can only be <8>
R4C8 can only be <8>
R1C8 can only be <3>
R4C9 can only be <4>
R4C7 can only be <2>
R3C4 can only be <8>
R6C5 can only be <5>
R4C2 can only be <5>
R5C7 can only be <6>
R5C1 can only be <7>
R6C1 can only be <6>
R7C4 can only be <2>
R3C5 can only be <6>
R9C2 can only be <7>
R5C2 can only be <2>
R9C1 can only be <5>


 

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