Oct 09 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R3C7 is the only square in row 3 that can be <1>
R4C9 is the only square in row 4 that can be <6>
R4C7 is the only square in row 4 that can be <8>
R8C7 can only be <9>
R8C9 can only be <4>
R4C1 is the only square in row 4 that can be <5>
R5C2 is the only square in row 5 that can be <1>
R6C7 is the only square in row 6 that can be <5>
R7C7 is the only square in row 7 that can be <7>
R2C7 can only be <2>
R8C3 is the only square in row 8 that can be <1>
R9C4 is the only square in row 9 that can be <1>
R5C8 is the only square in column 8 that can be <3>
R2C9 is the only square in column 9 that can be <7>
Squares R2C1 and R8C1 in column 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <36>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R6C1 - removing <3> from <237> leaving <27>
Squares R5C1 and R6C1 in block 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 block.
R4C3 - removing <2> from <234> leaving <34>
R6C3 - removing <2> from <234> leaving <34>
R4C6 is the only square in row 4 that can be <2>
R1C5 is the only square in column 5 that can be <2>
R5C5 is the only square in column 5 that can be <7>
R5C1 can only be <2>
R5C9 can only be <9>
R6C1 can only be <7>
R6C9 can only be <2>
Squares R3C6 and R3C8 in row 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <59>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R3C3 - removing <9> from <269> leaving <26>
R3C4 - removing <9> from <679> leaving <67>
R2C3 is the only square in column 3 that can be <9>
R9C5 is the only square in column 5 that can be <9>
R9C6 can only be <8>
R9C2 can only be <2>
R9C8 can only be <6>
R3C2 can only be <7>
R7C3 can only be <6>
R8C8 can only be <8>
R3C4 can only be <6>
R3C3 can only be <2>
R7C4 can only be <4>
R2C5 can only be <5>
R8C1 can only be <3>
R7C6 can only be <5>
R4C4 can only be <3>
R7C2 can only be <8>
R3C6 can only be <9>
R8C5 can only be <6>
R2C1 can only be <6>
R8C2 can only be <5>
R7C8 can only be <2>
R2C8 can only be <4>
R2C2 can only be <3>
R1C8 can only be <9>
R3C8 can only be <5>
R1C6 can only be <3>
R4C3 can only be <4>
R1C4 can only be <7>
R6C4 can only be <9>
R6C6 can only be <4>
R6C3 can only be <3>
R1C2 can only be <4>
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