Feb 20 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R5C5 can only be <8>
R5C9 can only be <1>
R5C1 can only be <9>
R6C7 can only be <7>
R2C2 is the only square in row 2 that can be <9>
R3C5 is the only square in row 3 that can be <3>
R3C9 is the only square in row 3 that can be <9>
R7C8 is the only square in row 7 that can be <7>
R7C6 is the only square in row 7 that can be <9>
R8C9 is the only square in row 8 that can be <3>
R4C7 is the only square in row 4 that can be <3>
R4C9 is the only square in row 4 that can be <4>
R7C1 is the only square in row 7 that can be <3>
R8C3 is the only square in row 8 that can be <9>
R9C1 is the only square in column 1 that can be <4>
R3C4 is the only square in block 2 that can be <4>
R9C9 is the only square in block 9 that can be <5>
Squares R6C8 and R6C9 in row 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <28>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R6C1 - removing <8> from <1568> leaving <156>
R6C3 - removing <8> from <168> leaving <16>
Squares R6C6 and R8C6 in column 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <56>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R1C6 - removing <56> from <2567> leaving <27>
R3C6 - removing <56> from <2567> leaving <27>
Squares R1C6 and R3C6 in block 2 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.
R2C4 - removing <2> from <256> leaving <56>
R2C1 is the only square in row 2 that can be <2>
R2C7 is the only square in row 2 that can be <1>
R7C7 can only be <4>
R7C5 can only be <6>
R1C7 can only be <5>
R8C8 can only be <6>
R8C6 can only be <5>
R3C8 can only be <2>
R7C9 can only be <8>
R3C6 can only be <7>
R1C8 can only be <4>
R6C8 can only be <8>
R1C9 can only be <6>
R6C9 can only be <2>
R9C8 can only be <1>
R2C5 can only be <5>
R7C2 can only be <2>
R8C5 can only be <4>
R6C6 can only be <6>
R9C4 can only be <2>
R1C1 can only be <8>
R2C4 can only be <6>
R1C6 can only be <2>
R6C3 can only be <1>
R4C4 can only be <5>
R7C4 can only be <1>
R1C2 can only be <7>
R4C1 can only be <6>
R6C1 can only be <5>
R3C3 can only be <6>
R3C2 can only be <5>
R9C3 can only be <8>
R4C2 can only be <8>
R4C3 can only be <7>
R9C2 can only be <6>
R3C1 can only be <1>
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