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 Sudoku Solution Path    Copyright © Kevin Stone R8C9 can only be <8> R9C4 can only be <2> R8C8 can only be <9> R8C7 can only be <5> R6C5 is the only square in row 6 that can be <9> R9C8 is the only square in row 9 that can be <7> R1C4 is the only square in row 1 that can be <7> R9C2 is the only square in row 9 that can be <4> R7C5 is the only square in column 5 that can be <1> R3C5 is the only square in column 5 that can be <2> R5C6 is the only square in column 6 that can be <4> R4C8 is the only square in column 8 that can be <4> R4C3 is the only square in row 4 that can be <1> R5C8 is the only square in row 5 that can be <1> R8C1 is the only square in row 8 that can be <1> R6C8 is the only square in column 8 that can be <8> Squares R6C3 and R8C3 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.    R2C3 - removing <3> from <357> leaving <57>    R3C3 - removing <3> from <378> leaving <78>    R7C3 - removing <3> from <358> leaving <58> Squares R1C8 and R2C8 in block 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <36>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.    R2C7 - removing <36> from <2369> leaving <29>    R2C9 - removing <6> from <267> leaving <27>    R3C7 - removing <36> from <3469> leaving <49>    R3C9 - removing <6> from <467> leaving <47> Squares R8C2 and R8C3 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 <358> leaving <58> Squares R7C1 and R7C3 in row 7 form a simple locked pair. These 2 squares both contain the 2 possibilities <58>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.    R7C6 - removing <58> from <3589> leaving <39> R9C6 is the only square in column 6 that can be <8> R9C5 can only be <5> R1C6 is the only square in column 6 that can be <5> R1C2 is the only square in row 1 that can be <9> R2C7 is the only square in row 2 that can be <9> R3C7 can only be <4> R3C9 can only be <7> R7C7 can only be <6> R3C3 can only be <8> R2C9 can only be <2> R7C9 can only be <4> R4C7 can only be <3> R5C9 can only be <6> R7C3 can only be <5> R6C7 can only be <2> R5C4 can only be <3> R6C3 can only be <3> R7C1 can only be <8> R2C3 can only be <7> R5C5 can only be <8> R7C4 can only be <9> R5C1 can only be <5> R4C5 can only be <6> R6C2 can only be <6> R8C3 can only be <2> R7C6 can only be <3> R3C4 can only be <6> R3C6 can only be <9> R8C2 can only be <3> R3C1 can only be <3> R1C5 can only be <3> R4C2 can only be <8> R5C2 can only be <2> R2C2 can only be <5> R1C8 can only be <6> R2C8 can only be <3> R2C1 can only be <6> [Puzzle Code = Sudoku-20191021-Hard-006921]

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