Nov 27 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R7C1 can only be <3>
R7C2 can only be <6>
R8C2 can only be <9>
R8C3 can only be <1>
R8C1 can only be <4>
R3C9 is the only square in row 3 that can be <1>
R2C4 is the only square in row 2 that can be <1>
R2C5 is the only square in row 2 that can be <6>
R4C3 is the only square in row 4 that can be <2>
R2C3 can only be <3>
R6C3 can only be <6>
R4C9 is the only square in row 4 that can be <6>
R5C1 is the only square in row 5 that can be <1>
R6C9 is the only square in row 6 that can be <9>
R8C4 is the only square in row 8 that can be <6>
R5C2 is the only square in column 2 that can be <3>
R5C9 can only be <8>
R2C9 can only be <7>
R7C9 can only be <2>
R8C9 can only be <3>
R9C5 is the only square in column 5 that can be <3>
Squares R4C1 and R6C1 in column 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <57>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R2C1 - removing <5> from <589> leaving <89>
R3C1 - removing <5> from <589> leaving <89>
Squares R3C1 and R3C8 in row 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <89>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R3C5 - removing <8> from <258> leaving <25>
Squares R1C4 and R9C4 in column 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <89>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R6C4 - removing <8> from <358> leaving <35>
R6C6 is the only square in row 6 that can be <8>
R9C6 can only be <9>
R9C4 can only be <8>
R1C6 can only be <4>
R1C5 can only be <8>
R1C4 can only be <9>
R4C7 is the only square in row 4 that can be <4>
R2C7 can only be <8>
R5C8 can only be <5>
R5C5 can only be <4>
R7C8 can only be <7>
R6C7 can only be <3>
R6C4 can only be <5>
R7C5 can only be <5>
R8C8 can only be <8>
R8C7 can only be <5>
R3C8 can only be <9>
R2C1 can only be <9>
R3C1 can only be <8>
R2C8 can only be <4>
R6C1 can only be <7>
R4C4 can only be <3>
R4C6 can only be <7>
R3C5 can only be <2>
R3C2 can only be <5>
R8C5 can only be <7>
R2C6 can only be <5>
R4C1 can only be <5>
R8C6 can only be <2>
R2C2 can only be <2>
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