Jan 24 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R3C5 is the only square in row 3 that can be <8>
R3C2 is the only square in row 3 that can be <2>
R4C5 is the only square in row 4 that can be <7>
R5C5 is the only square in row 5 that can be <3>
R7C2 is the only square in row 7 that can be <8>
R9C3 is the only square in column 3 that can be <4>
R6C1 is the only square in column 1 that can be <4>
R6C2 is the only square in row 6 that can be <5>
R7C8 is the only square in column 8 that can be <4>
R7C9 is the only square in row 7 that can be <5>
R8C1 is the only square in row 8 that can be <5>
R3C1 can only be <1>
R4C3 is the only square in column 3 that can be <1>
Squares R4C1 and R4C2 in row 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <39>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R4C4 - removing <9> from <289> leaving <28>
R4C8 - removing <3> from <368> leaving <68>
R4C9 - removing <39> from <2369> leaving <26>
R6C9 is the only square in column 9 that can be <9>
R4C9 is the only square in column 9 that can be <2>
R4C4 can only be <8>
R6C7 can only be <3>
R6C8 can only be <8>
R4C8 can only be <6>
R3C8 can only be <5>
R3C3 can only be <6>
R2C9 is the only square in row 2 that can be <6>
R8C6 is the only square in row 8 that can be <8>
R2C4 is the only square in column 4 that can be <2>
R5C6 is the only square in column 6 that can be <4>
R5C4 can only be <9>
Squares R9C1 and R9C8 in row 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <37>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R9C7 - removing <7> from <267> leaving <26>
Squares R6C5 and R7C5 in column 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <12>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R1C5 - removing <1> from <1459> leaving <459>
R2C5 - removing <1> from <159> leaving <59>
R8C5 - removing <1> from <146> leaving <46>
R9C5 - removing <2> from <269> leaving <69>
R2C6 is the only square in row 2 that can be <1>
R6C6 can only be <2>
R1C4 can only be <4>
R6C5 can only be <1>
R9C6 can only be <9>
R9C5 can only be <6>
R8C4 can only be <1>
R7C5 can only be <2>
R7C7 can only be <1>
R1C7 can only be <7>
R8C9 can only be <3>
R8C2 can only be <7>
R1C9 can only be <1>
R9C8 can only be <7>
R9C7 can only be <2>
R8C5 can only be <4>
R9C1 can only be <3>
R2C8 can only be <3>
R8C7 can only be <6>
R2C3 can only be <5>
R4C1 can only be <9>
R2C5 can only be <9>
R1C3 can only be <3>
R2C1 can only be <7>
R1C5 can only be <5>
R4C2 can only be <3>
R1C2 can only be <9>
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