Dec 08 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R5C4 can only be <2>
R1C4 can only be <8>
R4C4 can only be <4>
R4C1 is the only square in row 4 that can be <3>
R4C3 is the only square in row 4 that can be <1>
R3C3 is the only square in column 3 that can be <9>
R3C5 can only be <2>
R2C5 can only be <9>
R9C8 is the only square in column 8 that can be <7>
R2C2 is the only square in block 1 that can be <8>
Squares R1C1 and R1C2 in row 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <27>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R1C8 - removing <2> from <269> leaving <69>
Squares R9C2 and R9C6 in row 9 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 row.
R9C3 - removing <2> from <248> leaving <48>
Squares R1C1 and R1C2 in block 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <27>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
R2C1 - removing <2> from <125> leaving <15>
Squares R2C1 and R3C1 in column 1 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 column.
R6C1 - removing <5> from <2457> leaving <247>
R8C1 - removing <15> from <145> leaving <4>
R8C5 can only be <8>
R9C3 can only be <8>
R8C3 can only be <5>
R7C5 can only be <4>
R9C9 can only be <4>
R5C3 can only be <7>
R7C3 can only be <2>
R6C1 can only be <2>
R6C2 can only be <5>
R6C3 can only be <4>
R1C1 can only be <7>
R6C6 can only be <9>
R6C9 can only be <8>
R5C6 can only be <5>
R6C7 can only be <7>
R7C9 can only be <5>
R7C6 can only be <1>
R9C2 can only be <3>
R7C2 can only be <7>
R8C6 can only be <3>
R7C7 can only be <8>
R2C9 can only be <2>
R8C2 can only be <1>
R9C6 can only be <2>
R1C2 can only be <2>
R2C8 can only be <5>
R4C9 can only be <6>
R4C7 can only be <5>
R8C9 can only be <9>
R5C7 can only be <9>
R1C7 can only be <6>
R8C8 can only be <6>
R1C8 can only be <9>
R2C1 can only be <1>
R3C8 can only be <8>
R4C8 can only be <2>
R3C7 can only be <3>
R3C4 can only be <1>
R2C7 can only be <4>
R2C4 can only be <3>
R3C1 can only be <5>
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