Aug 25 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R6C4 can only be <1>
R1C5 is the only square in column 5 that can be <1>
R4C7 is the only square in column 7 that can be <1>
R8C9 is the only square in column 9 that can be <9>
R6C7 is the only square in block 6 that can be <2>
Squares R5C5 and R6C6 in block 5 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 block.
R4C6 - removing <8> from <489> leaving <49>
Squares R4C4 and R4C6 in row 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <49>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R4C1 - removing <9> from <2689> leaving <268>
R4C3 - removing <9> from <29> leaving <2>
R4C9 - removing <4> from <468> leaving <68>
Squares R4C9 and R6C9 in column 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <68>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R2C9 - removing <68> from <468> leaving <4>
R3C9 - removing <6> from <1367> leaving <137>
R5C9 - removing <8> from <478> leaving <47>
R7C9 - removing <8> from <1378> leaving <137>
R2C3 can only be <9>
R5C9 can only be <7>
R1C8 can only be <8>
R5C8 can only be <4>
R2C7 can only be <6>
R2C1 can only be <2>
R1C7 can only be <3>
R1C2 can only be <6>
R8C7 can only be <7>
R3C9 can only be <1>
R2C5 can only be <8>
R5C5 can only be <3>
R3C8 can only be <7>
R7C9 can only be <3>
R8C5 can only be <2>
R6C6 can only be <8>
R6C9 can only be <6>
R4C9 can only be <8>
R7C1 can only be <8>
R7C6 can only be <5>
R9C5 can only be <6>
R9C7 can only be <8>
R9C8 can only be <2>
R7C8 can only be <1>
R3C2 can only be <3>
R3C1 can only be <5>
R9C2 can only be <9>
R4C1 can only be <6>
R7C2 can only be <2>
R5C1 can only be <9>
R7C4 can only be <7>
R1C6 can only be <9>
R3C6 can only be <6>
R5C2 can only be <8>
R1C4 can only be <5>
R4C6 can only be <4>
R3C4 can only be <2>
R6C1 can only be <3>
R1C3 can only be <4>
R4C4 can only be <9>
R9C6 can only be <3>
R6C3 can only be <5>
R8C1 can only be <4>
R9C4 can only be <4>
R8C3 can only be <3>
R9C3 can only be <7>
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