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Sudoku Solution Path

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Puzzle Copyright © Kevin Stone

R2C8 is the only square in row 2 that can be <2>
R6C5 is the only square in row 6 that can be <6>
R6C8 is the only square in row 6 that can be <1>
R5C5 is the only square in row 5 that can be <1>
R5C6 is the only square in row 5 that can be <2>
R5C4 is the only square in row 5 that can be <9>
R5C2 is the only square in row 5 that can be <5>
R2C1 is the only square in row 2 that can be <5>
R5C3 is the only square in row 5 that can be <8>
R6C4 is the only square in row 6 that can be <7>
R2C4 can only be <4>
R4C8 is the only square in row 4 that can be <7>
R9C8 can only be <8>
R7C8 is the only square in row 7 that can be <5>
R2C7 is the only square in column 7 that can be <8>
Squares R7C3 and R7C7 in row 7 form a simple locked pair. These 2 squares both contain the 2 possibilities <46>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R7C2 - removing <46> from <2468> leaving <28>
Squares R4C2 and R6C2 in column 2 form a simple locked pair. These 2 squares both contain the 2 possibilities <34>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R1C2 - removing <3> from <389> leaving <89>
   R2C2 - removing <3> from <13679> leaving <1679>
   R3C2 - removing <3> from <13679> leaving <1679>
   R8C2 - removing <4> from <1246789> leaving <126789>
Squares R1C1 and R1C2 in row 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <89>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R1C8 - removing <9> from <349> leaving <34>
R3C8 is the only square in column 8 that can be <9>
R8C8 is the only square in column 8 that can be <6>
R7C7 can only be <4>
R7C3 can only be <6>
R5C7 can only be <3>
R5C8 can only be <4>
R8C7 can only be <1>
R1C8 can only be <3>
R3C7 can only be <6>
R9C9 can only be <7>
R8C9 can only be <3>
R1C9 can only be <4>
R2C9 can only be <1>
R2C2 is the only square in row 2 that can be <6>
R3C2 is the only square in row 3 that can be <1>
R9C2 can only be <9>
R9C1 can only be <1>
R1C2 can only be <8>
R8C1 can only be <8>
R1C1 can only be <9>
R7C2 can only be <2>
R7C5 can only be <8>
R8C2 can only be <7>
R4C5 can only be <3>
R8C4 can only be <5>
R8C3 can only be <4>
R8C6 can only be <9>
R4C4 can only be <8>
R8C5 can only be <2>
R2C6 can only be <3>
R2C3 can only be <7>
R6C6 can only be <4>
R3C5 can only be <7>
R3C3 can only be <3>
R2C5 can only be <9>
R4C2 can only be <4>
R6C2 can only be <3>
R4C6 can only be <5>

[Puzzle Code = Sudoku-20200525-Hard-125515]

 

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