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Sudoku Solution Path

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R2C1 can only be <6>
R1C9 is the only square in row 1 that can be <6>
R1C8 is the only square in row 1 that can be <2>
R9C7 is the only square in column 7 that can be <7>
R8C7 is the only square in column 7 that can be <6>
R8C9 is the only square in row 8 that can be <2>
R9C6 is the only square in row 9 that can be <2>
R4C7 is the only square in row 4 that can be <2>
R4C8 is the only square in column 8 that can be <9>
R9C2 is the only square in column 2 that can be <9>
R2C9 is the only square in column 9 that can be <9>
R2C5 can only be <5>
Squares R3C7 and R3C8 in row 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <35>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R3C2 - removing <3> from <134> leaving <14>
   R3C3 - removing <3> from <1348> leaving <148>
Intersection of row 4 with block 5. The value <5> only appears in one or more of squares R4C4, R4C5 and R4C6 of row 4. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain this value.
   R5C4 - removing <5> from <157> leaving <17>
   R5C6 - removing <5> from <3579> leaving <379>
Intersection of column 7 with block 6. The value <1> only appears in one or more of squares R4C7, R5C7 and R6C7 of column 7. These squares are the ones that intersect with block 6. Thus, the other (non-intersecting) squares of block 6 cannot contain this value.
   R5C9 - removing <1> from <1345> leaving <345>
   R6C9 - removing <1> from <134> leaving <34>
Intersection of column 8 with block 9. The values <48> only appears in one or more of squares R7C8, R8C8 and R9C8 of column 8. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain these values.
   R7C9 - removing <4> from <1345> leaving <135>
   R9C9 - removing <4> from <145> leaving <15>
Squares R1C2<13>, R3C2<14> and R8C2<34> in column 2 form a comprehensive locked triplet. These 3 squares can only contain the 3 possibilities <134>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R4C2 - removing <3> from <367> leaving <67>
   R7C2 - removing <134> from <13467> leaving <67>
R7C9 is the only square in row 7 that can be <1>
R9C9 can only be <5>
R5C7 is the only square in row 5 that can be <5>
R3C7 can only be <3>
R3C8 can only be <5>
R6C7 can only be <1>
R8C1 is the only square in row 8 that can be <5>
R9C3 is the only square in row 9 that can be <1>
R9C4 is the only square in row 9 that can be <6>
R6C4 can only be <8>
R7C5 can only be <8>
R7C6 can only be <5>
R3C5 can only be <1>
R7C4 can only be <4>
R3C2 can only be <4>
R1C5 can only be <9>
R1C4 can only be <7>
R7C8 can only be <3>
R7C1 can only be <7>
R4C4 can only be <5>
R5C4 can only be <1>
R1C6 can only be <8>
R5C5 can only be <2>
R1C1 can only be <3>
R3C3 can only be <8>
R8C2 can only be <3>
R6C5 can only be <6>
R7C2 can only be <6>
R4C2 can only be <7>
R8C3 can only be <4>
R1C2 can only be <1>
R8C8 can only be <8>
R9C1 can only be <8>
R9C8 can only be <4>
R5C1 can only be <4>
R4C6 can only be <3>
R4C3 can only be <6>
R6C6 can only be <9>
R5C9 can only be <3>
R6C1 can only be <2>
R5C3 can only be <9>
R6C9 can only be <4>
R6C3 can only be <3>
R5C6 can only be <7>


 

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