Dec 11 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R1C8 can only be <2>
R2C8 can only be <6>
R3C9 can only be <1>
R3C7 can only be <3>
R2C9 can only be <4>
R1C5 is the only square in row 1 that can be <4>
R3C6 is the only square in row 3 that can be <2>
R3C5 is the only square in row 3 that can be <9>
R4C7 is the only square in row 4 that can be <7>
R7C4 is the only square in row 7 that can be <3>
R1C1 is the only square in row 1 that can be <3>
R2C6 is the only square in row 2 that can be <3>
R5C2 is the only square in row 5 that can be <3>
R7C5 is the only square in row 7 that can be <8>
R8C1 is the only square in row 8 that can be <4>
R8C4 is the only square in column 4 that can be <2>
R9C2 is the only square in column 2 that can be <2>
R2C5 is the only square in block 2 that can be <5>
Squares R8C2 and R8C6 in row 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <15>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R8C5 - removing <1> from <167> leaving <67>
R8C8 - removing <5> from <59> leaving <9>
R8C9 - removing <5> from <5679> leaving <679>
R5C8 can only be <8>
R6C8 can only be <5>
R6C6 is the only square in row 6 that can be <8>
R4C6 can only be <4>
Squares R5C1 and R5C5 in row 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <16>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R5C3 - removing <16> from <1469> leaving <49>
R5C7 - removing <6> from <246> leaving <24>
R5C9 - removing <6> from <269> leaving <29>
Squares R1C4 and R2C4 in column 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <17>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R6C4 - removing <1> from <169> leaving <69>
R6C3 is the only square in row 6 that can be <1>
R1C3 can only be <7>
R5C1 can only be <6>
R1C4 can only be <1>
R7C3 can only be <5>
R2C4 can only be <7>
R5C5 can only be <1>
R3C1 can only be <5>
R3C3 can only be <6>
R4C3 can only be <9>
R8C2 can only be <1>
R8C6 can only be <5>
R2C2 can only be <8>
R7C1 can only be <7>
R9C6 can only be <1>
R9C7 can only be <6>
R9C5 can only be <7>
R6C7 can only be <4>
R8C9 can only be <7>
R2C1 can only be <1>
R4C2 can only be <5>
R4C1 can only be <8>
R4C4 can only be <6>
R5C3 can only be <4>
R6C4 can only be <9>
R5C7 can only be <2>
R5C9 can only be <9>
R7C7 can only be <1>
R6C9 can only be <6>
R7C9 can only be <2>
R8C5 can only be <6>
R9C9 can only be <5>
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