The full reasoning can be found below the Sudoku.
Feb 13 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R2C4 can only be <2>
R2C8 is the only square in row 2 that can be <4>
R2C9 is the only square in row 2 that can be <3>
R1C1 is the only square in row 1 that can be <3>
R3C9 is the only square in row 3 that can be <6>
R4C4 is the only square in row 4 that can be <4>
R7C1 is the only square in row 7 that can be <4>
R7C5 is the only square in row 7 that can be <8>
R7C3 is the only square in row 7 that can be <9>
R7C2 is the only square in row 7 that can be <6>
R4C6 is the only square in row 4 that can be <6>
R9C6 can only be <2>
R8C6 can only be <9>
R8C5 can only be <7>
R9C4 can only be <6>
R6C3 is the only square in row 6 that can be <6>
R9C2 is the only square in row 9 that can be <3>
R8C7 is the only square in row 8 that can be <3>
R4C7 can only be <2>
R9C1 is the only square in column 1 that can be <7>
R9C9 can only be <1>
R9C3 can only be <5>
R2C3 can only be <1>
R2C5 can only be <5>
R3C3 can only be <2>
Squares R3C1 and R3C2 in row 3 form a simple naked 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.
R3C7 - removing <5> from <157> leaving <17>
R3C8 - removing <5> from <579> leaving <79>
Squares R4C1 and R4C2 in row 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <18>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R4C5 - removing <1> from <139> leaving <39>
Squares R6C4 and R6C9 in row 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <78>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R6C2 - removing <8> from <1258> leaving <125>
R6C6 - removing <8> from <158> leaving <15>
R6C8 - removing <7> from <37> leaving <3>
R4C8 can only be <9>
R4C5 can only be <3>
R3C8 can only be <7>
R3C7 can only be <1>
R3C5 can only be <9>
R1C7 can only be <5>
R1C8 can only be <2>
R7C7 can only be <7>
R1C9 can only be <9>
R7C8 can only be <5>
R1C4 can only be <8>
R5C5 can only be <2>
R6C5 can only be <1>
R6C6 can only be <5>
R6C2 can only be <2>
R5C6 can only be <8>
R7C9 can only be <2>
R1C6 can only be <1>
R6C4 can only be <7>
R5C1 can only be <5>
R5C9 can only be <7>
R5C4 can only be <9>
R6C9 can only be <8>
R8C2 can only be <1>
R8C1 can only be <2>
R4C2 can only be <8>
R4C1 can only be <1>
R3C2 can only be <5>
R3C1 can only be <8>
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