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Sudoku Solution Path

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R1C5 can only be <3>
R9C5 can only be <6>
R3C5 can only be <7>
R7C5 can only be <5>
R1C7 is the only square in row 1 that can be <5>
R2C7 is the only square in row 2 that can be <4>
R4C8 is the only square in row 4 that can be <8>
R5C6 is the only square in row 5 that can be <6>
R6C4 is the only square in row 6 that can be <3>
R8C1 is the only square in row 8 that can be <4>
R4C3 is the only square in column 3 that can be <7>
R4C4 is the only square in row 4 that can be <5>
R5C2 is the only square in row 5 that can be <5>
R8C3 is the only square in row 8 that can be <5>
R6C6 is the only square in column 6 that can be <7>
R5C4 can only be <9>
R4C6 can only be <2>
R4C1 can only be <9>
R7C4 is the only square in column 4 that can be <7>
R8C7 is the only square in column 7 that can be <7>
Squares R9C4 and R9C6 in row 9 form a simple locked pair. These 2 squares both contain the 2 possibilities <48>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R9C1 - removing <8> from <1238> leaving <123>
   R9C7 - removing <8> from <189> leaving <19>
Intersection of row 1 with block 1. The value <2> only appears in one or more of squares R1C1, R1C2 and R1C3 of row 1. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.
   R3C3 - removing <2> from <2369> leaving <369>
Intersection of row 7 with block 7. The value <6> only appears in one or more of squares R7C1, R7C2 and R7C3 of row 7. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.
   R8C2 - removing <6> from <68> leaving <8>
R7C1 can only be <1>
R5C1 can only be <2>
R5C8 can only be <7>
R9C1 can only be <3>
R6C2 can only be <1>
R5C9 can only be <1>
R6C9 can only be <9>
R2C2 can only be <9>
R6C7 can only be <2>
R9C8 can only be <9>
R2C1 can only be <8>
R9C3 can only be <2>
R9C7 can only be <1>
R2C8 can only be <3>
R7C7 can only be <8>
R7C2 can only be <6>
R2C3 can only be <1>
R2C9 can only be <7>
R8C8 can only be <6>
R7C3 can only be <9>
R1C2 can only be <2>
R3C7 can only be <9>
R8C9 can only be <3>
R3C8 can only be <2>
R1C3 can only be <6>
R1C9 can only be <8>
R3C3 can only be <3>
R1C4 can only be <4>
R3C9 can only be <6>
R3C6 can only be <8>
R1C6 can only be <9>
R9C4 can only be <8>
R9C6 can only be <4>


 

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