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Sudoku Solution Path

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R8C6 is the only square in row 8 that can be <4>
R8C2 is the only square in column 2 that can be <9>
R1C5 is the only square in column 5 that can be <4>
R1C8 is the only square in column 8 that can be <8>
R9C9 is the only square in column 9 that can be <3>
R3C6 is the only square in block 2 that can be <7>
R3C4 is the only square in row 3 that can be <8>
R9C6 is the only square in block 8 that can be <2>
R6C6 can only be <1>
R7C4 is the only square in column 4 that can be <1>
R8C9 is the only square in block 9 that can be <5>
Squares R4C5 and R4C6 in row 4 form a simple locked pair. These 2 squares both contain the 2 possibilities <68>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R4C2 - removing <8> from <12358> leaving <1235>
   R4C4 - removing <6> from <256> leaving <25>
   R4C7 - removing <6> from <156> leaving <15>
   R4C8 - removing <6> from <12346> leaving <1234>
Squares R4C5 and R9C5 in column 5 form a simple locked pair. These 2 squares both contain the 2 possibilities <68>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R5C5 - removing <68> from <6789> leaving <79>
Intersection of column 1 with block 1. The values <34> 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 these values.
   R1C2 - removing <3> from <2367> leaving <267>
   R2C2 - removing <3> from <3567> leaving <567>
Intersection of column 3 with block 7. The value <6> 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.
   R9C2 - removing <6> from <15678> leaving <1578>
Intersection of column 7 with block 3. The value <7> only appears in one or more of squares R1C7, R2C7 and R3C7 of column 7. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.
   R2C8 - removing <7> from <1467> leaving <146>
Intersection of column 8 with block 6. The values <23> only appears in one or more of squares R4C8, R5C8 and R6C8 of column 8. These squares are the ones that intersect with block 6. Thus, the other (non-intersecting) squares of block 6 cannot contain these values.
   R5C9 - removing <2> from <1269> leaving <169>
Intersection of column 9 with block 3. The values <24> only appears in one or more of squares R1C9, R2C9 and R3C9 of column 9. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain these values.
   R2C8 - removing <4> from <146> leaving <16>
Squares R2C8 and R8C8 in column 8 form a simple locked pair. These 2 squares both contain the 2 possibilities <16>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R4C8 - removing <1> from <1234> leaving <234>
   R5C8 - removing <16> from <1269> leaving <29>
   R7C8 - removing <6> from <679> leaving <79>
   R9C8 - removing <16> from <167> leaving <7>
R7C8 can only be <9>
R7C9 can only be <6>
R5C8 can only be <2>
R7C6 can only be <8>
R8C8 can only be <1>
R8C1 can only be <2>
R2C8 can only be <6>
R2C4 can only be <3>
R7C1 can only be <7>
R4C6 can only be <6>
R9C5 can only be <6>
R8C3 can only be <6>
R3C1 can only be <4>
R9C3 can only be <5>
R5C3 can only be <7>
R4C5 can only be <8>
R1C4 can only be <6>
R3C9 can only be <2>
R3C2 can only be <6>
R1C9 can only be <9>
R5C5 can only be <9>
R5C9 can only be <1>
R6C5 can only be <7>
R2C9 can only be <4>
R4C7 can only be <5>
R1C1 can only be <3>
R2C1 can only be <5>
R1C7 can only be <7>
R2C2 can only be <7>
R5C1 can only be <8>
R2C7 can only be <1>
R1C2 can only be <2>
R4C4 can only be <2>
R5C7 can only be <6>
R6C7 can only be <9>
R5C2 can only be <5>
R9C1 can only be <1>
R9C2 can only be <8>
R6C2 can only be <3>
R4C3 can only be <4>
R6C4 can only be <5>
R6C8 can only be <4>
R4C2 can only be <1>
R6C3 can only be <2>
R4C8 can only be <3>


 

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