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Sudoku Solution Path

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Copyright © Kevin Stone

R3C9 is the only square in row 3 that can be <6>
R9C7 is the only square in column 7 that can be <7>
R1C9 is the only square in column 9 that can be <3>
Intersection of column 4 with block 5. The value <4> 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 this value.
   R4C5 - removing <4> from <2458> leaving <258>
   R5C5 - removing <4> from <124578> leaving <12578>
   R6C5 - removing <4> from <1468> leaving <168>
Intersection of block 2 with row 2. The value <9> only appears in one or more of squares R2C4, R2C5 and R2C6 of block 2. These squares are the ones that intersect with row 2. Thus, the other (non-intersecting) squares of row 2 cannot contain this value.
   R2C1 - removing <9> from <2789> leaving <278>
   R2C2 - removing <9> from <1289> leaving <128>
   R2C8 - removing <9> from <1259> leaving <125>
Intersection of block 6 with row 5. The value <8> only appears in one or more of squares R5C7, R5C8 and R5C9 of block 6. These squares are the ones that intersect with row 5. Thus, the other (non-intersecting) squares of row 5 cannot contain this value.
   R5C1 - removing <8> from <248> leaving <24>
   R5C3 - removing <8> from <28> leaving <2>
   R5C4 - removing <8> from <45789> leaving <4579>
   R5C5 - removing <8> from <12578> leaving <1257>
R5C1 can only be <4>
R3C5 is the only square in row 3 that can be <4>
R1C2 is the only square in row 1 that can be <4>
R9C2 is the only square in column 2 that can be <9>
R7C7 is the only square in row 7 that can be <9>
R3C7 can only be <8>
R3C3 can only be <3>
R1C7 can only be <1>
R1C3 can only be <8>
R5C7 can only be <5>
R3C1 can only be <9>
R9C3 can only be <5>
R4C8 can only be <4>
R7C3 can only be <1>
R1C5 can only be <7>
R5C5 can only be <1>
R2C6 can only be <9>
R2C4 can only be <8>
R5C6 can only be <7>
R1C1 can only be <2>
R6C8 can only be <1>
R5C9 can only be <8>
R5C4 can only be <9>
R1C8 can only be <9>
R2C1 can only be <7>
R7C1 can only be <6>
R2C2 can only be <1>
R4C4 can only be <5>
R6C4 can only be <4>
R8C4 can only be <7>
R8C1 can only be <8>
R9C1 can only be <3>
R8C2 can only be <2>
R8C6 can only be <6>
R8C8 can only be <5>
R6C6 can only be <3>
R9C5 can only be <2>
R8C9 can only be <1>
R2C8 can only be <2>
R7C9 can only be <2>
R9C8 can only be <6>
R9C9 can only be <4>
R4C5 can only be <8>
R7C5 can only be <5>
R2C9 can only be <5>
R4C2 can only be <3>
R6C5 can only be <6>
R6C2 can only be <8>
R4C6 can only be <2>

[Puzzle Code = Sudoku-20200523-Hard-096052]

 

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