Mar 10 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R6C6 can only be <5>
R2C6 can only be <6>
R4C4 is the only square in row 4 that can be <6>
R5C2 is the only square in row 5 that can be <5>
R9C3 is the only square in row 9 that can be <8>
R2C4 is the only square in column 4 that can be <5>
R2C5 can only be <9>
R2C9 can only be <8>
R3C5 can only be <7>
R4C5 can only be <2>
R8C5 can only be <3>
R8C4 can only be <4>
R7C5 can only be <5>
R8C6 can only be <2>
Squares R4C8 and R5C7 in block 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <79>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
R5C8 - removing <79> from <3789> leaving <38>
R6C8 - removing <9> from <389> leaving <38>
Squares R5C8 and R6C8 in column 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <38>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R9C8 - removing <3> from <1235> leaving <125>
Squares R1C9<579>, R3C9<59> and R8C9<79> in column 9 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <579>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R7C9 - removing <9> from <349> leaving <34>
R9C9 - removing <5> from <345> leaving <34>
R9C8 is the only square in row 9 that can be <5>
R2C8 is the only square in column 8 that can be <2>
R3C3 is the only square in row 3 that can be <2>
R7C7 is the only square in row 7 that can be <2>
R9C7 can only be <1>
R9C2 is the only square in row 9 that can be <2>
R1C2 is the only square in column 2 that can be <3>
R8C2 is the only square in column 2 that can be <6>
R8C1 is the only square in row 8 that can be <1>
R2C1 can only be <4>
R2C2 can only be <1>
R9C1 can only be <3>
R6C2 can only be <9>
R1C3 can only be <9>
R6C4 can only be <3>
R4C2 can only be <4>
R6C8 can only be <8>
R5C4 can only be <9>
R6C5 can only be <1>
R5C8 can only be <3>
R9C9 can only be <4>
R7C1 can only be <9>
R7C9 can only be <3>
R7C3 can only be <4>
R4C6 can only be <7>
R5C3 can only be <1>
R4C8 can only be <9>
R5C6 can only be <4>
R8C8 can only be <7>
R5C7 can only be <7>
R5C5 can only be <8>
R1C7 can only be <6>
R8C9 can only be <9>
R1C8 can only be <1>
R3C9 can only be <5>
R1C1 can only be <5>
R3C7 can only be <9>
R3C1 can only be <6>
R1C9 can only be <7>
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