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Common Answers

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Sudoku Solution Path

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R5C5 is the only square in row 5 that can be <5>
R1C3 is the only square in row 1 that can be <5>
R6C8 is the only square in row 6 that can be <5>
R4C4 is the only square in column 4 that can be <9>
R4C8 can only be <3>
Squares R4C6 and R4C7 in row 4 form a simple locked pair. These 2 squares both contain the 2 possibilities <26>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R4C2 - removing <2> from <248> leaving <48>
   R4C3 - removing <2> from <248> leaving <48>
Intersection of row 5 with block 4. The value <3> 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.
   R6C3 - removing <3> from <1237> leaving <127>
Intersection of column 5 with block 8. The value <6> only appears in one or more of squares R7C5, R8C5 and R9C5 of column 5. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain this value.
   R7C6 - removing <6> from <1256> leaving <125>
   R8C6 - removing <6> from <136> leaving <13>
Intersection of column 8 with block 3. The value <9> only appears in one or more of squares R1C8, R2C8 and R3C8 of column 8. 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 <9> from <2789> leaving <278>
   R3C9 - removing <9> from <1249> leaving <124>
Intersection of column 9 with block 9. The value <6> only appears in one or more of squares R7C9, R8C9 and R9C9 of column 9. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.
   R8C7 - removing <6> from <14689> leaving <1489>
   R9C7 - removing <6> from <167> leaving <17>
R9C5 is the only square in row 9 that can be <6>
R7C5 can only be <2>
R1C5 can only be <8>
R3C5 can only be <3>
R9C3 is the only square in row 9 that can be <3>
R5C1 is the only square in row 5 that can be <3>
R9C2 is the only square in row 9 that can be <2>
R1C7 is the only square in row 1 that can be <2>
R4C7 can only be <6>
R4C6 can only be <2>
R6C7 can only be <1>
R6C2 can only be <7>
R5C7 can only be <9>
R9C7 can only be <7>
R9C8 can only be <1>
R7C8 can only be <8>
R6C4 can only be <3>
R5C9 can only be <2>
R5C3 can only be <1>
R6C3 can only be <2>
R1C2 can only be <9>
R6C6 can only be <6>
R7C2 can only be <1>
R8C7 can only be <4>
R8C4 can only be <1>
R2C7 can only be <8>
R7C9 can only be <6>
R1C8 can only be <7>
R3C8 can only be <9>
R8C3 can only be <8>
R7C6 can only be <5>
R7C4 can only be <4>
R7C1 can only be <7>
R8C9 can only be <9>
R8C1 can only be <6>
R4C3 can only be <4>
R8C6 can only be <3>
R3C4 can only be <2>
R2C4 can only be <5>
R4C2 can only be <8>
R2C3 can only be <7>
R2C1 can only be <2>
R3C1 can only be <8>
R2C6 can only be <1>
R2C9 can only be <4>
R3C6 can only be <7>
R3C9 can only be <1>
R3C2 can only be <4>


 

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