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Sudoku Solution Path

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R5C6 can only be <2>
R8C5 can only be <2>
R9C3 can only be <9>
R8C4 can only be <9>
R8C6 can only be <1>
R7C6 can only be <8>
R2C6 can only be <9>
R2C2 can only be <7>
R3C6 can only be <5>
R2C4 can only be <2>
R2C5 can only be <8>
R2C8 can only be <4>
R1C2 is the only square in row 1 that can be <5>
R3C8 is the only square in row 3 that can be <8>
R1C3 is the only square in row 1 that can be <8>
R1C5 is the only square in row 1 that can be <6>
R5C5 can only be <4>
R3C4 can only be <7>
R3C5 can only be <3>
R7C4 can only be <4>
R5C4 can only be <6>
R7C5 can only be <7>
R9C5 can only be <5>
R3C9 is the only square in row 3 that can be <1>
R4C1 is the only square in row 4 that can be <5>
R6C7 is the only square in row 6 that can be <8>
R9C2 is the only square in row 9 that can be <4>
R4C9 is the only square in row 4 that can be <4>
R6C1 is the only square in row 6 that can be <4>
Squares R9C7 and R9C8 in block 9 form a simple locked pair. These 2 squares both contain the 2 possibilities <17>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R7C8 - removing <1> from <1369> leaving <369>
Intersection of column 3 with block 4. The values <367> only appears in one or more of squares R4C3, R5C3 and R6C3 of column 3. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain these values.
   R4C2 - removing <36> from <1236> leaving <12>
   R6C2 - removing <6> from <269> leaving <29>
Squares R1C8<39>, R7C8<369> and R8C8<36> in column 8 form a comprehensive locked triplet. These 3 squares can only contain the 3 possibilities <369>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R4C8 - removing <36> from <1236> leaving <12>
   R6C8 - removing <69> from <2679> leaving <27>
R4C3 is the only square in row 4 that can be <6>
R6C3 can only be <7>
R6C8 can only be <2>
R5C3 can only be <3>
R6C2 can only be <9>
R4C8 can only be <1>
R4C2 can only be <2>
R4C7 can only be <3>
R9C8 can only be <7>
R5C9 can only be <9>
R5C1 can only be <1>
R5C7 can only be <7>
R6C9 can only be <6>
R3C2 can only be <6>
R7C9 can only be <3>
R8C8 can only be <6>
R8C2 can only be <3>
R7C8 can only be <9>
R9C7 can only be <1>
R3C1 can only be <9>
R7C2 can only be <1>
R1C7 can only be <9>
R7C1 can only be <6>
R1C8 can only be <3>


 

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