Sep 22 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R5C9 can only be <6>
R5C5 can only be <8>
R5C4 is the only square in row 5 that can be <5>
R6C7 is the only square in row 6 that can be <4>
R4C7 can only be <2>
R6C9 can only be <1>
R6C3 is the only square in row 6 that can be <8>
R8C3 is the only square in column 3 that can be <5>
R8C4 is the only square in column 4 that can be <3>
Squares R3C4 and R6C4 in column 4 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 column.
R1C4 - removing <27> from <2678> leaving <68>
R9C4 - removing <7> from <678> leaving <68>
R1C2 is the only square in row 1 that can be <2>
Squares R8C9 and R9C9 in column 9 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 column.
R2C9 - removing <7> from <237> leaving <23>
R3C9 - removing <79> from <2379> leaving <23>
Squares R6C4 and R6C5 in block 5 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 block.
R4C5 - removing <7> from <67> leaving <6>
R4C6 - removing <7> from <3467> leaving <346>
R8C8 is the only square in row 8 that can be <6>
R7C7 can only be <1>
R3C7 can only be <9>
R1C1 is the only square in row 1 that can be <9>
R1C7 is the only square in row 1 that can be <5>
R2C7 can only be <6>
R2C1 is the only square in row 2 that can be <5>
R3C8 is the only square in row 3 that can be <1>
R8C9 is the only square in row 8 that can be <9>
R9C9 can only be <7>
R9C8 can only be <4>
R9C2 can only be <8>
R9C4 can only be <6>
R9C3 can only be <9>
R9C6 can only be <1>
R1C4 can only be <8>
R8C5 can only be <7>
R1C8 can only be <7>
R2C6 can only be <7>
R1C6 can only be <6>
R2C8 can only be <8>
R2C2 can only be <3>
R7C6 can only be <8>
R3C4 can only be <2>
R3C9 can only be <3>
R6C4 can only be <7>
R2C5 can only be <1>
R3C3 can only be <7>
R2C9 can only be <2>
R6C5 can only be <2>
R8C2 can only be <4>
R7C2 can only be <7>
R4C3 can only be <3>
R4C6 can only be <4>
R7C3 can only be <6>
R5C1 can only be <4>
R4C1 can only be <7>
R5C6 can only be <3>
R8C1 can only be <1>
R7C1 can only be <3>
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