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 Sudoku Solution Path    Copyright © Kevin Stone R2C1 is the only square in row 2 that can be <5> R3C4 is the only square in row 3 that can be <4> R1C8 is the only square in row 1 that can be <4> R5C6 is the only square in row 5 that can be <4> R5C4 is the only square in row 5 that can be <6> R9C2 is the only square in row 9 that can be <1> R2C7 is the only square in column 7 that can be <3> R5C7 is the only square in column 7 that can be <1> R5C9 is the only square in column 9 that can be <2> Intersection of row 2 with block 2. The value <2> only appears in one or more of squares R2C4, R2C5 and R2C6 of row 2. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain this value.    R1C4 - removing <2> from <237> leaving <37> Intersection of row 2 with block 3. The value <6> only appears in one or more of squares R2C7, R2C8 and R2C9 of row 2. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.    R3C9 - removing <6> from <678> leaving <78> Intersection of column 1 with block 1. The value <3> only appears in one or more of squares R1C1, R2C1 and R3C1 of column 1. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.    R1C2 - removing <3> from <239> leaving <29>    R3C2 - removing <3> from <36> leaving <6> Squares R8C2 and R8C3 in row 8 form a simple locked pair. These 2 squares both contain the 2 possibilities <25>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.    R8C1 - removing <2> from <268> leaving <68>    R8C5 - removing <25> from <23578> leaving <378> R2C5 is the only square in column 5 that can be <2> R2C4 can only be <7> R2C8 can only be <6> R1C4 can only be <3> R2C9 can only be <1> R4C4 can only be <5> R3C5 can only be <8> R3C9 can only be <7> R1C6 can only be <1> R3C1 can only be <3> R1C9 can only be <8> R9C4 can only be <2> R5C3 is the only square in row 5 that can be <5> R8C3 can only be <2> R8C2 can only be <5> R6C5 is the only square in row 6 that can be <1> R6C2 is the only square in row 6 that can be <2> R1C2 can only be <9> R1C3 can only be <7> R4C2 can only be <3> R1C1 can only be <2> R6C3 can only be <9> R6C8 can only be <7> R5C1 can only be <7> R6C6 can only be <3> R4C7 can only be <8> R4C8 can only be <9> R9C7 can only be <7> R4C5 can only be <7> R5C5 can only be <9> R8C5 can only be <3> R8C9 can only be <6> R7C5 can only be <5> R8C1 can only be <8> R9C9 can only be <9> R7C9 can only be <3> R7C8 can only be <8> R7C6 can only be <6> R9C8 can only be <5> R8C6 can only be <7> R9C1 can only be <6> R9C6 can only be <8> R7C1 can only be <9> [Puzzle Code = Sudoku-20191117-Hard-046327]

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