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Sudoku Solution Path

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R1C6 can only be <2>
R2C5 is the only square in row 2 that can be <1>
R3C1 is the only square in row 3 that can be <9>
R8C2 is the only square in row 8 that can be <5>
R1C1 is the only square in row 1 that can be <5>
R2C7 is the only square in row 2 that can be <5>
R9C7 is the only square in row 9 that can be <1>
Squares R3C4 and R3C5 in row 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <35>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R3C3 - removing <3> from <237> leaving <27>
Squares R7C1 and R9C1 in column 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <46>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R2C1 - removing <6> from <268> leaving <28>
   R4C1 - removing <4> from <248> leaving <28>
Squares R7C1 and R9C1 in block 7 form a simple locked pair. These 2 squares both contain the 2 possibilities <46>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R7C2 - removing <4> from <347> leaving <37>
   R8C3 - removing <6> from <367> leaving <37>
Intersection of row 3 with block 3. The value <8> only appears in one or more of squares R3C7, R3C8 and R3C9 of row 3. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.
   R2C8 - removing <8> from <268> leaving <26>
Intersection of column 4 with block 5. The values <27> only appears in one or more of squares R4C4, R5C4 and R6C4 of column 4. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain these values.
   R4C5 - removing <2> from <2469> leaving <469>
   R6C5 - removing <2> from <23459> leaving <3459>
Intersection of column 7 with block 6. The value <8> only appears in one or more of squares R4C7, R5C7 and R6C7 of column 7. These squares are the ones that intersect with block 6. Thus, the other (non-intersecting) squares of block 6 cannot contain this value.
   R5C8 - removing <8> from <46789> leaving <4679>
   R6C8 - removing <8> from <489> leaving <49>
   R6C9 - removing <8> from <48> leaving <4>
R6C8 can only be <9>
R6C7 can only be <8>
R7C1 is the only square in row 7 that can be <4>
R9C1 can only be <6>
R9C4 can only be <3>
R9C9 can only be <8>
R3C4 can only be <5>
R7C6 can only be <9>
R9C8 can only be <4>
R3C5 can only be <3>
R6C4 can only be <2>
R6C5 can only be <5>
R6C3 can only be <1>
R5C6 can only be <8>
R4C6 can only be <1>
R6C6 can only be <3>
R3C8 is the only square in row 3 that can be <8>
R8C7 is the only square in row 8 that can be <9>
Squares R4C4 and R4C7 in row 4 form a simple locked pair. These 2 squares both contain the 2 possibilities <67>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R4C5 - removing <6> from <469> leaving <49>
Squares R5C4 and R5C8 in row 5 form a simple locked pair. These 2 squares both contain the 2 possibilities <67>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R5C5 - removing <6> from <469> leaving <49>
Intersection of block 3 with column 9. The value <7> only appears in one or more of squares R1C9, R2C9 and R3C9 of block 3. These squares are the ones that intersect with column 9. Thus, the other (non-intersecting) squares of column 9 cannot contain this value.
   R7C9 - removing <7> from <2367> leaving <236>
   R8C9 - removing <7> from <2367> leaving <236>
Squares R5C2, R5C5, R4C2 and R4C5 form a Type-1 Unique Rectangle on <49>.
   R4C2 - removing <49> from <489> leaving <8>
R4C1 can only be <2>
R2C2 can only be <3>
R7C2 can only be <7>
R4C3 can only be <4>
R2C1 can only be <8>
R4C5 can only be <9>
R5C2 can only be <9>
R5C5 can only be <4>
R7C7 can only be <6>
R1C2 can only be <4>
R8C3 can only be <3>
R7C5 can only be <2>
R4C7 can only be <7>
R8C9 can only be <2>
R8C5 can only be <6>
R8C8 can only be <7>
R3C9 can only be <7>
R7C9 can only be <3>
R3C3 can only be <2>
R1C9 can only be <6>
R4C4 can only be <6>
R5C8 can only be <6>
R5C4 can only be <7>
R2C8 can only be <2>
R1C3 can only be <7>
R2C3 can only be <6>


 

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