Mar 24 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R1C4 can only be <1>
R7C4 can only be <3>
R9C2 can only be <8>
R1C7 can only be <2>
R7C2 can only be <7>
R3C4 can only be <9>
R8C4 can only be <8>
R4C4 can only be <6>
R3C6 is the only square in row 3 that can be <3>
R6C6 can only be <8>
R7C7 is the only square in row 7 that can be <9>
R7C9 is the only square in row 7 that can be <6>
R8C2 is the only square in row 8 that can be <3>
R8C3 is the only square in row 8 that can be <1>
R7C1 is the only square in column 1 that can be <2>
R3C7 is the only square in column 7 that can be <4>
Squares R2C5 and R2C6 in row 2 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.
R2C1 - removing <5> from <1578> leaving <178>
R2C8 - removing <5> from <567> leaving <67>
Squares R4C7 and R4C9 in row 4 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.
R4C1 - removing <18> from <1348> leaving <34>
Squares R7C3 and R9C3 in column 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <45>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R3C3 - removing <5> from <568> leaving <68>
R5C3 - removing <4> from <4678> leaving <678>
Squares R4C7 and R4C9 in block 6 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 block.
R5C7 - removing <8> from <68> leaving <6>
R5C9 - removing <8> from <278> leaving <27>
R6C9 - removing <1> from <17> leaving <7>
R5C2 can only be <9>
R6C3 can only be <6>
R5C9 can only be <2>
R5C8 can only be <3>
R6C2 can only be <1>
R3C3 can only be <8>
R5C3 can only be <7>
R5C5 can only be <4>
R4C8 can only be <9>
R6C1 can only be <3>
R2C2 can only be <6>
R2C8 can only be <7>
R2C1 can only be <1>
R1C8 can only be <5>
R5C1 can only be <8>
R4C5 can only be <3>
R6C5 can only be <9>
R4C1 can only be <4>
R1C1 can only be <7>
R3C8 can only be <6>
R8C8 can only be <2>
R3C9 can only be <1>
R2C7 can only be <8>
R3C1 can only be <5>
R4C7 can only be <1>
R4C9 can only be <8>
R8C5 can only be <5>
R8C9 can only be <4>
R2C5 can only be <2>
R7C6 can only be <4>
R9C9 can only be <5>
R9C3 can only be <4>
R2C6 can only be <5>
R7C3 can only be <5>
R9C6 can only be <2>
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