Dec 01 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R2C4 can only be <3>
R6C8 can only be <4>
R1C5 is the only square in row 1 that can be <5>
R3C3 is the only square in row 3 that can be <9>
R4C5 is the only square in row 4 that can be <6>
R6C5 is the only square in row 6 that can be <3>
R7C9 is the only square in row 7 that can be <9>
R5C4 is the only square in row 5 that can be <9>
R4C4 can only be <8>
R4C8 can only be <9>
R8C9 is the only square in row 8 that can be <3>
R1C7 is the only square in row 1 that can be <3>
R9C3 is the only square in row 9 that can be <3>
R9C2 is the only square in row 9 that can be <9>
Squares R3C5 and R3C7 in row 3 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 row.
R3C1 - removing <47> from <1247> leaving <12>
R3C9 - removing <47> from <1247> leaving <12>
Squares R5C7 and R5C9 in row 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <78>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R5C1 - removing <7> from <1257> leaving <125>
R5C5 - removing <7> from <147> leaving <14>
R5C6 - removing <7> from <12457> leaving <1245>
R3C5 is the only square in column 5 that can be <7>
R3C7 can only be <4>
R2C6 can only be <4>
R5C5 is the only square in row 5 that can be <4>
R5C7 is the only square in column 7 that can be <7>
R5C9 can only be <8>
R9C9 is the only square in column 9 that can be <4>
R9C8 is the only square in row 9 that can be <2>
R8C8 is the only square in block 9 that can be <1>
Squares R8C4 and R8C6 in row 8 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 row.
R8C1 - removing <5> from <458> leaving <48>
R8C2 - removing <5> from <458> leaving <48>
R6C2 is the only square in column 2 that can be <5>
R6C4 can only be <2>
R6C6 can only be <7>
R8C4 can only be <5>
R4C6 can only be <1>
R8C6 can only be <2>
R4C2 can only be <7>
R5C6 can only be <5>
R2C2 is the only square in column 2 that can be <1>
R2C9 can only be <7>
R3C1 can only be <2>
R1C9 can only be <2>
R3C9 can only be <1>
R5C1 can only be <1>
R1C3 can only be <6>
R5C3 can only be <2>
R1C8 can only be <8>
R7C3 can only be <1>
R2C1 can only be <8>
R1C2 can only be <4>
R2C8 can only be <6>
R8C1 can only be <4>
R9C1 can only be <5>
R7C5 can only be <8>
R7C7 can only be <5>
R9C5 can only be <1>
R7C1 can only be <6>
R9C7 can only be <8>
R8C2 can only be <8>
R1C1 can only be <7>
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