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Sudoku Solution Path

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R1C3 can only be <8>
R1C5 can only be <4>
R1C7 can only be <6>
R3C7 is the only square in row 3 that can be <4>
R3C1 is the only square in row 3 that can be <6>
R3C3 is the only square in row 3 that can be <9>
R4C5 is the only square in row 4 that can be <6>
R7C9 is the only square in row 7 that can be <6>
R9C7 is the only square in row 9 that can be <9>
R8C1 is the only square in row 8 that can be <9>
R2C3 is the only square in column 3 that can be <5>
Squares R8C3 and R9C3 in column 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <23>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R5C3 - removing <3> from <134> leaving <14>
   R7C3 - removing <23> from <1234> leaving <14>
Squares R8C3 and R9C3 in block 7 form a simple locked pair. These 2 squares both contain the 2 possibilities <23>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R7C1 - removing <3> from <1347> leaving <147>
Intersection of row 8 with block 9. The value <8> only appears in one or more of squares R8C7, R8C8 and R8C9 of row 8. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.
   R7C7 - removing <8> from <238> leaving <23>
Squares R9C3, R9C5, R8C3 and R8C5 form a Type-1 Unique Rectangle on <23>.
   R8C5 - removing <23> from <235> leaving <5>
R6C6 is the only square in row 6 that can be <5>
R6C1 is the only square in row 6 that can be <4>
R5C3 can only be <1>
R7C3 can only be <4>
R4C9 is the only square in row 4 that can be <1>
R3C2 is the only square in row 3 that can be <1>
R7C2 can only be <7>
R2C1 can only be <7>
R7C1 can only be <1>
R2C5 can only be <3>
R2C9 can only be <8>
R6C5 can only be <1>
R9C5 can only be <2>
R3C6 can only be <2>
R2C7 can only be <1>
R3C4 can only be <7>
R9C3 can only be <3>
R5C5 can only be <7>
R8C3 can only be <2>
R8C9 can only be <3>
R8C7 can only be <8>
R3C9 can only be <5>
R6C9 can only be <9>
R7C7 can only be <2>
R7C8 can only be <5>
R3C8 can only be <3>
R6C4 can only be <3>
R5C9 can only be <2>
R5C7 can only be <3>
R5C1 can only be <8>
R7C4 can only be <8>
R4C6 can only be <8>
R7C6 can only be <3>
R4C4 can only be <2>
R5C4 can only be <9>
R4C1 can only be <3>
R5C6 can only be <4>


 

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