Dec 13 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R6C5 can only be <7>
R8C5 can only be <6>
R5C5 can only be <8>
R2C5 can only be <2>
R4C5 can only be <3>
R1C8 is the only square in row 1 that can be <3>
R6C4 is the only square in row 6 that can be <9>
R8C4 can only be <1>
R9C4 can only be <3>
R8C6 can only be <9>
R8C2 can only be <2>
R7C6 can only be <8>
R7C1 is the only square in row 7 that can be <3>
R2C6 is the only square in column 6 that can be <7>
Squares R4C1 and R8C1 in column 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <47>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R5C1 - removing <47> from <2457> leaving <25>
R6C1 - removing <4> from <245> leaving <25>
Squares R5C1 and R6C1 in column 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <25>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R3C1 - removing <25> from <2589> leaving <89>
R9C1 - removing <5> from <589> leaving <89>
Squares R1C3 and R3C3 in column 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <25>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R5C3 - removing <25> from <124567> leaving <1467>
R9C3 - removing <5> from <56> leaving <6>
R9C7 can only be <9>
R9C1 can only be <8>
R2C7 can only be <6>
R2C4 can only be <5>
R2C8 can only be <8>
R9C2 can only be <5>
R3C1 can only be <9>
R6C2 can only be <1>
R2C9 can only be <9>
R5C4 can only be <4>
R1C6 can only be <4>
R3C2 can only be <8>
R3C4 can only be <6>
R4C6 can only be <1>
R4C2 can only be <6>
R7C2 can only be <9>
R5C3 can only be <7>
R5C6 can only be <5>
R8C3 can only be <4>
R4C1 can only be <4>
R5C1 can only be <2>
R8C1 can only be <7>
R7C3 can only be <1>
R4C8 can only be <7>
R4C9 can only be <8>
R5C7 can only be <1>
R6C1 can only be <5>
R5C9 can only be <6>
R1C7 can only be <2>
R1C3 can only be <5>
R7C7 can only be <4>
R3C8 can only be <4>
R3C7 can only be <7>
R3C9 can only be <5>
R6C8 can only be <2>
R3C3 can only be <2>
R1C9 can only be <1>
R6C9 can only be <4>
R7C8 can only be <6>
R7C9 can only be <2>
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