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Sudoku Solution Path

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R7C9 is the only square in column 9 that can be <4>
Intersection of row 1 with block 3. The value <2> only appears in one or more of squares R1C7, R1C8 and R1C9 of row 1. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.
   R3C7 - removing <2> from <1236789> leaving <136789>
   R3C8 - removing <2> from <12678> leaving <1678>
Intersection of row 9 with block 7. The value <5> only appears in one or more of squares R9C1, R9C2 and R9C3 of row 9. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.
   R7C2 - removing <5> from <1359> leaving <139>
   R7C3 - removing <5> from <1235789> leaving <123789>
Intersection of column 1 with block 1. The value <6> 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 this value.
   R2C3 - removing <6> from <13679> leaving <1379>
   R3C3 - removing <6> from <1345679> leaving <134579>
Intersection of block 8 with row 7. The values <15> only appears in one or more of squares R7C4, R7C5 and R7C6 of block 8. These squares are the ones that intersect with row 7. Thus, the other (non-intersecting) squares of row 7 cannot contain these values.
   R7C1 - removing <1> from <179> leaving <79>
   R7C2 - removing <1> from <139> leaving <39>
   R7C3 - removing <1> from <123789> leaving <23789>
   R7C7 - removing <1> from <126789> leaving <26789>
   R7C8 - removing <1> from <12678> leaving <2678>
Squares R1C2 and R7C2 in column 2 form a simple locked pair. These 2 squares both contain the 2 possibilities <39>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R3C2 - removing <39> from <13459> leaving <145>
   R5C2 - removing <9> from <49> leaving <4>
R4C3 can only be <1>
R4C4 can only be <5>
R3C3 is the only square in row 3 that can be <4>
R3C2 is the only square in row 3 that can be <5>
R9C2 can only be <1>
R5C7 is the only square in row 5 that can be <5>
R7C5 is the only square in row 7 that can be <5>
R8C7 is the only square in row 8 that can be <1>
R2C1 is the only square in row 2 that can be <1>
R2C7 is the only square in row 2 that can be <6>
R3C8 is the only square in row 3 that can be <1>
R3C1 is the only square in row 3 that can be <6>
R7C8 is the only square in row 7 that can be <6>
R9C3 is the only square in row 9 that can be <5>
R7C3 is the only square in column 3 that can be <2>
R7C7 is the only square in row 7 that can be <8>
R4C7 can only be <4>
R4C5 can only be <2>
R6C7 can only be <7>
R6C6 can only be <1>
R9C7 can only be <2>
R5C8 can only be <8>
R9C8 can only be <7>
R1C8 can only be <2>
R8C9 can only be <9>
R4C6 can only be <8>
R6C4 can only be <9>
R8C1 can only be <7>
R2C9 can only be <7>
R3C9 can only be <8>
R6C3 can only be <6>
R8C5 can only be <3>
R7C1 can only be <9>
R8C3 can only be <8>
R2C5 can only be <9>
R7C6 can only be <7>
R2C3 can only be <3>
R3C5 can only be <7>
R3C4 can only be <3>
R5C5 can only be <6>
R5C3 can only be <9>
R6C5 can only be <4>
R7C2 can only be <3>
R1C2 can only be <9>
R7C4 can only be <1>
R5C6 can only be <3>
R1C7 can only be <3>
R1C3 can only be <7>
R3C7 can only be <9>
R3C6 can only be <2>
R5C4 can only be <7>


 

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