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Sudoku Solution Path

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R7C8 is the only square in row 7 that can be <3>
R7C2 is the only square in row 7 that can be <1>
R8C5 is the only square in row 8 that can be <6>
R2C3 is the only square in column 3 that can be <1>
R9C8 is the only square in column 8 that can be <9>
R5C2 is the only square in column 2 that can be <9>
R8C1 is the only square in column 1 that can be <9>
Squares R1C8 and R3C8 in column 8 form a simple locked pair. These 2 squares both contain the 2 possibilities <15>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R4C8 - removing <15> from <1568> leaving <68>
   R5C8 - removing <15> from <14568> leaving <468>
   R6C8 - removing <5> from <458> leaving <48>
Squares R4C3 and R4C8 in row 4 form a simple locked pair. These 2 squares both contain the 2 possibilities <68>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R4C2 - removing <8> from <258> leaving <25>
   R4C5 - removing <8> from <158> leaving <15>
   R4C7 - removing <8> from <1258> leaving <125>
Squares R6C3 and R6C8 in row 6 form a simple locked pair. These 2 squares both contain the 2 possibilities <48>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R6C2 - removing <48> from <2458> leaving <25>
   R6C5 - removing <8> from <358> leaving <35>
   R6C7 - removing <8> from <2358> leaving <235>
R9C2 is the only square in column 2 that can be <8>
R9C9 can only be <5>
R3C2 is the only square in column 2 that can be <4>
R1C2 is the only square in column 2 that can be <7>
R7C5 is the only square in column 5 that can be <8>
R7C4 can only be <2>
R7C6 can only be <9>
R2C4 can only be <5>
R2C1 can only be <2>
R8C4 can only be <7>
R3C6 can only be <2>
R8C3 can only be <4>
R3C4 can only be <1>
R9C5 can only be <4>
R9C1 can only be <7>
R8C6 can only be <5>
R1C1 can only be <5>
R3C5 can only be <7>
R3C8 can only be <5>
R5C4 can only be <8>
R1C5 can only be <3>
R1C8 can only be <1>
R6C3 can only be <8>
R5C6 can only be <3>
R5C1 can only be <4>
R2C5 can only be <9>
R6C5 can only be <5>
R2C6 can only be <4>
R1C9 can only be <2>
R5C8 can only be <6>
R5C9 can only be <1>
R5C3 can only be <7>
R4C8 can only be <8>
R5C7 can only be <5>
R8C9 can only be <8>
R6C8 can only be <4>
R4C3 can only be <6>
R6C2 can only be <2>
R4C5 can only be <1>
R8C7 can only be <1>
R2C9 can only be <3>
R2C7 can only be <8>
R4C7 can only be <2>
R6C7 can only be <3>
R4C2 can only be <5>


 

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