Dec 12 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R1C9 can only be <1>
R9C1 can only be <1>
R2C9 can only be <6>
R8C1 can only be <8>
R1C8 is the only square in row 1 that can be <8>
R3C4 is the only square in row 3 that can be <8>
R5C5 is the only square in row 5 that can be <7>
R5C1 is the only square in column 1 that can be <6>
Squares R1C1 and R2C1 in block 1 form a simple naked 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 block.
R1C2 - removing <34> from <349> leaving <9>
R1C5 can only be <4>
R1C1 can only be <3>
R2C1 can only be <4>
R5C3 is the only square in row 5 that can be <9>
R5C7 is the only square in row 5 that can be <8>
R4C3 is the only square in row 4 that can be <8>
Squares R4C7 and R6C7 in column 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <24>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R8C7 - removing <2> from <279> leaving <79>
Squares R4C7 and R6C7 in block 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <24>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
R5C9 - removing <2> from <235> leaving <35>
R5C2 is the only square in row 5 that can be <2>
R6C3 can only be <1>
R2C3 can only be <7>
R4C2 can only be <4>
R2C7 can only be <9>
R8C3 can only be <2>
R3C2 can only be <1>
R8C7 can only be <7>
R3C8 can only be <7>
R4C7 can only be <2>
R6C2 can only be <3>
R6C7 can only be <4>
R6C8 can only be <6>
R6C4 can only be <9>
R6C6 can only be <2>
R4C8 is the only square in row 4 that can be <1>
R7C5 is the only square in row 7 that can be <2>
R9C9 is the only square in row 9 that can be <2>
R9C2 is the only square in row 9 that can be <7>
R7C2 can only be <5>
R7C8 can only be <3>
R7C6 can only be <6>
R5C8 can only be <5>
R8C9 can only be <5>
R8C4 can only be <3>
R5C9 can only be <3>
R9C8 can only be <9>
R9C5 can only be <5>
R7C4 can only be <7>
R3C6 can only be <9>
R4C6 can only be <5>
R2C4 can only be <5>
R2C5 can only be <1>
R4C4 can only be <6>
R2C6 can only be <3>
R8C5 can only be <9>
R3C5 can only be <6>
R8C6 can only be <1>
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