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Sudoku Solution Path

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R3C5 can only be <2>
R7C5 can only be <7>
R3C1 can only be <5>
R7C4 can only be <4>
R5C5 can only be <1>
R1C3 can only be <8>
R5C4 can only be <7>
R5C6 can only be <2>
R1C4 can only be <1>
R3C2 can only be <6>
R8C4 can only be <6>
R2C3 can only be <7>
R2C1 can only be <2>
R1C2 can only be <3>
R1C8 can only be <5>
R1C9 can only be <2>
R2C6 is the only square in row 2 that can be <6>
R6C2 is the only square in row 6 that can be <7>
R6C7 is the only square in row 6 that can be <2>
R4C2 is the only square in row 4 that can be <2>
R8C1 is the only square in row 8 that can be <7>
R9C8 is the only square in row 9 that can be <7>
Squares R3C8 and R7C8 in column 8 form a simple locked pair. These 2 squares both contain the 2 possibilities <89>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R2C8 - removing <89> from <3489> leaving <34>
   R4C8 - removing <8> from <1468> leaving <146>
   R6C8 - removing <8> from <18> leaving <1>
Squares R6C9 and R7C9 in column 9 form a simple locked pair. These 2 squares both contain the 2 possibilities <58>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R2C9 - removing <8> from <348> leaving <34>
   R8C9 - removing <5> from <345> leaving <34>
Squares R2C8 and R2C9 in row 2 form a simple locked pair. These 2 squares both contain the 2 possibilities <34>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R2C7 - removing <34> from <3489> leaving <89>
Intersection of column 2 with block 7. The values <89> only appears in one or more of squares R7C2, R8C2 and R9C2 of column 2. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain these values.
   R8C3 - removing <9> from <159> leaving <15>
Squares R8C3 and R8C6 in row 8 form a simple locked pair. These 2 squares both contain the 2 possibilities <15>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R8C2 - removing <5> from <459> leaving <49>
   R8C7 - removing <5> from <3459> leaving <349>
Squares R2C7 and R4C6 form a remote locked pair. <89> can be removed from any square that is common to their groups.
   R4C7 - removing <8> from <48> leaving <4>
R4C1 can only be <1>
R4C8 can only be <6>
R5C8 can only be <3>
R5C7 can only be <5>
R2C8 can only be <4>
R2C9 can only be <3>
R8C9 can only be <4>
R4C3 can only be <9>
R9C1 can only be <4>
R4C6 can only be <8>
R6C3 can only be <5>
R3C6 can only be <9>
R6C4 can only be <9>
R5C2 can only be <4>
R5C3 can only be <6>
R9C7 can only be <8>
R6C9 can only be <8>
R8C3 can only be <1>
R2C4 can only be <8>
R7C9 can only be <5>
R8C6 can only be <5>
R9C6 can only be <1>
R8C2 can only be <9>
R9C2 can only be <5>
R2C7 can only be <9>
R7C8 can only be <9>
R8C7 can only be <3>
R3C8 can only be <8>
R7C2 can only be <8>


 

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