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Sudoku Solution Path

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R2C4 can only be <1>
R7C4 can only be <5>
R6C4 can only be <4>
R8C4 can only be <7>
R5C5 can only be <1>
R6C5 can only be <6>
R4C5 can only be <3>
R4C6 can only be <5>
R1C7 is the only square in row 1 that can be <1>
R2C3 is the only square in row 2 that can be <3>
R3C1 is the only square in row 3 that can be <7>
R1C5 is the only square in row 1 that can be <7>
R3C9 is the only square in row 3 that can be <4>
R4C8 is the only square in row 4 that can be <6>
R4C2 is the only square in row 4 that can be <7>
R5C8 is the only square in row 5 that can be <7>
R8C7 is the only square in row 8 that can be <3>
R9C5 is the only square in row 9 that can be <4>
R9C9 is the only square in row 9 that can be <7>
R1C3 is the only square in column 3 that can be <6>
R2C6 is the only square in row 2 that can be <6>
Squares R8C5 and R8C6 in row 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 row.
   R8C1 - removing <89> from <1589> leaving <15>
   R8C2 - removing <89> from <5689> leaving <56>
   R8C8 - removing <89> from <12589> leaving <125>
Squares R1C1 and R1C2 in block 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <59>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R2C1 - removing <59> from <4589> leaving <48>
   R2C2 - removing <59> from <24589> leaving <248>
   R3C3 - removing <9> from <289> leaving <28>
Intersection of row 4 with block 4. The value <1> only appears in one or more of squares R4C1, R4C2 and R4C3 of row 4. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain this value.
   R6C3 - removing <1> from <12589> leaving <2589>
R4C3 is the only square in column 3 that can be <1>
R4C1 can only be <4>
R4C7 can only be <2>
R2C1 can only be <8>
R2C5 can only be <9>
R3C3 can only be <2>
R8C5 can only be <8>
R3C6 can only be <8>
R3C8 can only be <9>
R2C2 can only be <4>
R8C6 can only be <9>
R5C7 is the only square in row 5 that can be <4>
R6C2 is the only square in row 6 that can be <2>
R6C3 is the only square in row 6 that can be <9>
R9C7 is the only square in row 9 that can be <9>
R7C7 can only be <8>
R6C7 can only be <5>
R9C8 can only be <5>
R9C3 can only be <8>
R2C8 can only be <2>
R2C9 can only be <5>
R8C8 can only be <1>
R6C9 can only be <1>
R6C8 can only be <8>
R7C9 can only be <6>
R7C2 can only be <9>
R8C9 can only be <2>
R8C1 can only be <5>
R5C3 can only be <5>
R5C2 can only be <8>
R7C1 can only be <1>
R1C2 can only be <5>
R8C2 can only be <6>
R1C1 can only be <9>


 

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