Jan 18 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R5C6 can only be <4>
R2C6 can only be <1>
R4C6 can only be <9>
R8C6 can only be <5>
R6C6 can only be <8>
R2C8 is the only square in row 2 that can be <8>
R7C2 is the only square in row 7 that can be <9>
R3C5 is the only square in row 3 that can be <9>
R1C3 is the only square in row 1 that can be <9>
R3C9 is the only square in row 3 that can be <5>
R1C5 is the only square in row 1 that can be <5>
R6C4 is the only square in row 6 that can be <5>
R8C7 is the only square in row 8 that can be <9>
R9C3 is the only square in row 9 that can be <5>
R1C2 is the only square in column 2 that can be <1>
R2C2 is the only square in column 2 that can be <2>
R5C3 is the only square in column 3 that can be <2>
Squares R2C4 and R2C5 in row 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <34>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R2C7 - removing <4> from <467> leaving <67>
Squares R4C1 and R4C4 in row 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <16>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R4C5 - removing <16> from <1267> leaving <27>
R4C9 - removing <6> from <267> leaving <27>
Squares R4C1 and R6C1 in column 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <16>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R1C1 - removing <6> from <346> leaving <34>
R7C1 - removing <6> from <3468> leaving <348>
R9C1 - removing <6> from <4678> leaving <478>
R2C3 is the only square in block 1 that can be <6>
R2C7 can only be <7>
R8C3 can only be <7>
R5C7 can only be <6>
R3C8 can only be <3>
R3C2 can only be <4>
R7C8 can only be <6>
R5C4 can only be <3>
R6C9 can only be <2>
R4C9 can only be <7>
R1C8 can only be <2>
R8C8 can only be <1>
R1C7 can only be <4>
R9C8 can only be <7>
R3C1 can only be <7>
R9C2 can only be <6>
R1C1 can only be <3>
R4C5 can only be <2>
R9C9 can only be <4>
R5C5 can only be <7>
R2C4 can only be <4>
R8C2 can only be <3>
R9C1 can only be <8>
R9C7 can only be <2>
R1C9 can only be <6>
R7C9 can only be <3>
R2C5 can only be <3>
R8C4 can only be <6>
R8C5 can only be <4>
R4C4 can only be <1>
R7C5 can only be <8>
R9C5 can only be <1>
R7C1 can only be <4>
R6C5 can only be <6>
R4C1 can only be <6>
R6C1 can only be <1>
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