Feb 25 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R2C5 can only be <8>
R3C3 can only be <2>
R8C5 can only be <3>
R3C6 is the only square in row 3 that can be <5>
R1C8 is the only square in row 1 that can be <5>
R4C4 is the only square in row 4 that can be <8>
R5C2 is the only square in row 5 that can be <5>
R4C7 is the only square in row 4 that can be <5>
R9C4 is the only square in row 9 that can be <5>
R8C3 is the only square in row 8 that can be <5>
R8C2 is the only square in column 2 that can be <2>
R7C4 is the only square in row 7 that can be <2>
R1C6 is the only square in row 1 that can be <2>
R7C7 is the only square in row 7 that can be <6>
R2C9 is the only square in row 2 that can be <6>
R9C2 is the only square in column 2 that can be <6>
R2C2 is the only square in column 2 that can be <3>
R6C3 is the only square in column 3 that can be <6>
R4C3 is the only square in column 3 that can be <3>
R1C9 is the only square in column 9 that can be <9>
R1C3 can only be <1>
R2C3 can only be <9>
Squares R9C6 and R9C7 in row 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <49>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R9C8 - removing <4> from <134> leaving <13>
Squares R3C9 and R4C9 in column 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <47>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R6C9 - removing <47> from <1347> leaving <13>
Squares R5C9 and R6C9 in block 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <13>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
R5C8 - removing <13> from <123> leaving <2>
R5C1 can only be <9>
R4C1 can only be <4>
R4C9 can only be <7>
R6C1 can only be <2>
R4C6 can only be <9>
R3C9 can only be <4>
R6C7 can only be <4>
R9C7 can only be <9>
R9C6 can only be <4>
R8C7 can only be <7>
R3C2 can only be <7>
R2C8 can only be <7>
R8C1 can only be <1>
R2C7 can only be <2>
R7C8 can only be <3>
R8C6 can only be <6>
R2C6 can only be <1>
R1C2 can only be <4>
R7C1 can only be <7>
R9C8 can only be <1>
R8C8 can only be <4>
R9C1 can only be <3>
R8C4 can only be <9>
R1C4 can only be <7>
R6C4 can only be <1>
R2C4 can only be <4>
R5C6 can only be <3>
R5C9 can only be <1>
R6C6 can only be <7>
R5C4 can only be <6>
R6C9 can only be <3>
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