Dec 05 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R3C1 is the only square in row 3 that can be <9>
R5C3 is the only square in row 5 that can be <4>
R5C9 is the only square in row 5 that can be <9>
R6C5 is the only square in row 6 that can be <5>
R7C8 is the only square in row 7 that can be <9>
R3C2 is the only square in column 2 that can be <6>
Squares R6C8 and R6C9 in row 6 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.
R6C2 - removing <7> from <178> leaving <18>
R6C3 - removing <27> from <1278> leaving <18>
R9C3 is the only square in column 3 that can be <2>
R4C1 is the only square in column 1 that can be <2>
Squares R8C1 and R8C5 in row 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <18>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R8C6 - removing <8> from <2458> leaving <245>
R8C7 - removing <1> from <125> leaving <25>
Squares R9C4 and R9C7 in row 9 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.
R9C2 - removing <1> from <147> leaving <47>
R9C9 - removing <16> from <1467> leaving <47>
R7C9 is the only square in column 9 that can be <6>
R9C7 can only be <1>
R9C4 can only be <6>
R5C4 can only be <8>
R5C6 can only be <7>
R5C1 can only be <3>
R1C6 can only be <5>
R4C5 can only be <6>
R5C7 can only be <6>
R1C7 can only be <3>
R1C8 can only be <6>
R4C7 can only be <8>
R4C2 can only be <7>
R4C8 can only be <3>
R9C2 can only be <4>
R9C9 can only be <7>
R6C9 can only be <2>
R6C8 can only be <7>
R2C9 can only be <1>
R2C4 can only be <2>
R3C9 can only be <4>
R3C8 can only be <2>
R3C4 can only be <1>
R3C6 can only be <8>
R7C4 can only be <5>
R3C3 can only be <5>
R3C5 can only be <3>
R8C8 can only be <4>
R7C7 can only be <2>
R7C6 can only be <4>
R8C7 can only be <5>
R8C6 can only be <2>
R2C5 can only be <7>
R2C3 can only be <8>
R2C2 can only be <3>
R6C3 can only be <1>
R6C2 can only be <8>
R1C3 can only be <7>
R1C1 can only be <1>
R7C2 can only be <1>
R7C5 can only be <8>
R8C1 can only be <8>
R7C1 can only be <7>
R8C5 can only be <1>
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