Apr 22 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R2C4 is the only square in row 2 that can be <2>
R6C5 is the only square in row 6 that can be <8>
R6C7 is the only square in row 6 that can be <5>
R2C7 can only be <7>
R9C7 can only be <6>
R2C8 is the only square in row 2 that can be <5>
R2C9 is the only square in row 2 that can be <1>
R6C2 is the only square in row 6 that can be <1>
R5C8 is the only square in row 5 that can be <1>
R8C6 is the only square in row 8 that can be <2>
R5C6 can only be <5>
R8C3 is the only square in row 8 that can be <5>
R7C6 is the only square in column 6 that can be <3>
R1C3 is the only square in column 3 that can be <3>
R1C7 can only be <9>
R1C5 can only be <4>
R3C7 can only be <3>
R3C9 is the only square in column 9 that can be <4>
Squares R8C8 and R8C9 in row 8 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.
R8C1 - removing <89> from <3689> leaving <36>
R8C2 - removing <89> from <3689> leaving <36>
Squares R2C1 and R2C2 in block 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <48>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
R1C2 - removing <8> from <678> leaving <67>
R3C2 - removing <8> from <678> leaving <67>
Squares R1C2 and R3C2 in column 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <67>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R5C2 - removing <7> from <379> leaving <39>
R7C2 - removing <67> from <46789> leaving <489>
R8C2 - removing <6> from <36> leaving <3>
R8C1 can only be <6>
R5C2 can only be <9>
R5C4 can only be <6>
R6C1 can only be <2>
R5C5 can only be <2>
R7C4 can only be <8>
R5C9 can only be <7>
R4C5 can only be <9>
R5C1 can only be <3>
R6C9 can only be <9>
R8C9 can only be <8>
R4C8 can only be <6>
R7C2 can only be <4>
R9C4 can only be <5>
R8C8 can only be <9>
R1C9 can only be <6>
R9C5 can only be <1>
R3C4 can only be <9>
R7C5 can only be <6>
R1C2 can only be <7>
R4C9 can only be <2>
R3C8 can only be <8>
R3C5 can only be <5>
R3C6 can only be <7>
R2C2 can only be <8>
R9C3 can only be <7>
R7C8 can only be <7>
R9C1 can only be <8>
R9C8 can only be <4>
R4C3 can only be <4>
R7C3 can only be <1>
R7C1 can only be <9>
R1C6 can only be <8>
R3C2 can only be <6>
R2C1 can only be <4>
R4C1 can only be <7>
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