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Sudoku Solution Path

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R2C2 can only be <6>
R1C5 is the only square in row 1 that can be <5>
R2C3 is the only square in row 2 that can be <3>
R4C6 is the only square in row 4 that can be <5>
R5C6 is the only square in row 5 that can be <6>
R6C4 is the only square in row 6 that can be <3>
R5C9 is the only square in row 5 that can be <3>
R6C5 is the only square in row 6 that can be <9>
R2C7 is the only square in row 2 that can be <9>
R3C4 is the only square in row 3 that can be <9>
R5C1 is the only square in row 5 that can be <9>
R5C2 is the only square in row 5 that can be <5>
R7C1 is the only square in row 7 that can be <5>
R8C3 is the only square in row 8 that can be <6>
R9C7 is the only square in row 9 that can be <5>
R9C9 is the only square in row 9 that can be <9>
Squares R4C3 and R6C3 in column 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <47>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R1C3 - removing <4> from <248> leaving <28>
R1C1 is the only square in row 1 that can be <4>
Intersection of row 1 with block 3. The value <1> only appears in one or more of squares R1C7, R1C8 and R1C9 of row 1. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.
   R3C8 - removing <1> from <12478> leaving <2478>
   R3C9 - removing <1> from <127> leaving <27>
Intersection of column 8 with block 9. The value <1> only appears in one or more of squares R7C8, R8C8 and R9C8 of column 8. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.
   R7C9 - removing <1> from <127> leaving <27>
   R8C7 - removing <1> from <1278> leaving <278>
R1C9 is the only square in column 9 that can be <1>
Intersection of block 7 with row 9. The value <2> only appears in one or more of squares R9C1, R9C2 and R9C3 of block 7. These squares are the ones that intersect with row 9. Thus, the other (non-intersecting) squares of row 9 cannot contain this value.
   R9C5 - removing <2> from <128> leaving <18>
Squares R3C6 and R7C6 in column 6 and R3C9 and R7C9 in column 9 form a Simple X-Wing pattern on possibility <2>. All other instances of this possibility in rows 3 and 7 can be removed.
   R3C1 - removing <2> from <12> leaving <1>
   R7C4 - removing <2> from <248> leaving <48>
   R3C8 - removing <2> from <2478> leaving <478>
   R7C8 - removing <2> from <1278> leaving <178>
R3C2 can only be <8>
R9C1 can only be <2>
R1C3 can only be <2>
R9C3 can only be <8>
R9C5 can only be <1>
R1C7 can only be <8>
R4C7 is the only square in row 4 that can be <1>
R6C7 can only be <7>
R6C3 can only be <4>
R8C7 can only be <2>
R5C8 can only be <2>
R8C5 can only be <8>
R7C9 can only be <7>
R5C4 can only be <8>
R2C8 can only be <4>
R6C6 can only be <1>
R4C3 can only be <7>
R7C2 can only be <1>
R3C9 can only be <2>
R8C8 can only be <1>
R5C5 can only be <7>
R7C4 can only be <4>
R8C2 can only be <7>
R7C8 can only be <8>
R2C5 can only be <2>
R3C8 can only be <7>
R3C6 can only be <4>
R7C6 can only be <2>
R4C4 can only be <2>
R4C5 can only be <4>

 

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