Oct 24 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R3C1 is the only square in row 3 that can be <9>
R7C9 is the only square in row 7 that can be <9>
R7C5 is the only square in row 7 that can be <7>
R7C6 is the only square in row 7 that can be <8>
R6C2 is the only square in row 6 that can be <8>
R8C8 is the only square in row 8 that can be <5>
R9C4 is the only square in row 9 that can be <5>
R4C1 is the only square in column 1 that can be <6>
R4C9 can only be <2>
R6C9 can only be <4>
R8C9 can only be <6>
R9C9 can only be <7>
R6C6 is the only square in row 6 that can be <2>
R7C2 is the only square in row 7 that can be <6>
R9C6 is the only square in row 9 that can be <6>
R1C6 is the only square in column 6 that can be <3>
R4C4 is the only square in column 4 that can be <3>
R4C8 is the only square in row 4 that can be <8>
Squares R8C5 and R8C6 in row 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <14>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R8C2 - removing <1> from <123> leaving <23>
R8C3 - removing <14> from <1234> leaving <23>
Squares R8C2 and R8C3 in block 7 form a simple naked 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.
R9C3 - removing <2> from <124> leaving <14>
Squares R7C3 and R9C3 in column 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <14>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R1C3 - removing <14> from <12457> leaving <257>
R4C3 - removing <1> from <15> leaving <5>
R5C3 - removing <1> from <1579> leaving <579>
R6C3 - removing <1> from <139> leaving <39>
R4C7 can only be <1>
R6C7 can only be <9>
R5C8 can only be <6>
R6C3 can only be <3>
R5C7 can only be <5>
R6C1 can only be <1>
R8C3 can only be <2>
R8C2 can only be <3>
R1C3 can only be <7>
R5C3 can only be <9>
R1C1 can only be <4>
R5C2 can only be <7>
R3C2 can only be <2>
R1C4 can only be <1>
R1C7 can only be <2>
R2C1 can only be <3>
R1C2 can only be <5>
R9C7 can only be <4>
R2C8 can only be <4>
R2C7 can only be <7>
R3C8 can only be <3>
R7C8 can only be <1>
R3C5 can only be <4>
R2C2 can only be <1>
R3C4 can only be <7>
R8C5 can only be <1>
R7C3 can only be <4>
R9C8 can only be <2>
R8C6 can only be <4>
R5C5 can only be <8>
R5C6 can only be <1>
R9C3 can only be <1>
R2C4 can only be <8>
R3C7 can only be <6>
R5C4 can only be <4>
R2C5 can only be <2>
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