Mar 14 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R2C8 is the only square in row 2 that can be <5>
R6C4 is the only square in row 6 that can be <2>
R8C2 is the only square in row 8 that can be <7>
R7C2 is the only square in column 2 that can be <2>
Squares R2C2 and R4C2 in column 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <68>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R5C2 - removing <6> from <146> leaving <14>
R6C2 - removing <8> from <148> leaving <14>
Squares R5C2 and R6C2 in block 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <14>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
R5C3 - removing <4> from <4679> leaving <679>
R6C1 - removing <14> from <147> leaving <7>
R4C9 is the only square in column 9 that can be <7>
R4C6 is the only square in row 4 that can be <3>
R5C7 is the only square in row 5 that can be <3>
R3C9 is the only square in column 9 that can be <3>
R3C8 is the only square in block 3 that can be <2>
Squares R5C4 and R5C6 in row 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <79>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R5C3 - removing <9> from <69> leaving <6>
R5C8 - removing <9> from <1469> leaving <146>
R4C1 can only be <5>
R4C2 can only be <8>
R4C3 can only be <9>
R2C2 can only be <6>
R4C8 can only be <6>
R2C1 can only be <3>
R2C5 can only be <9>
R2C6 can only be <8>
R3C3 is the only square in row 3 that can be <8>
R7C1 is the only square in column 1 that can be <6>
R1C3 is the only square in column 3 that can be <7>
R9C9 is the only square in column 9 that can be <6>
R8C9 is the only square in column 9 that can be <2>
R8C5 can only be <3>
R8C4 can only be <9>
R8C8 can only be <4>
R5C4 can only be <7>
R5C8 can only be <1>
R7C9 can only be <8>
R5C6 can only be <9>
R3C4 can only be <6>
R5C2 can only be <4>
R6C8 can only be <9>
R7C4 can only be <5>
R6C9 can only be <4>
R9C7 can only be <1>
R9C5 can only be <2>
R7C7 can only be <9>
R3C7 can only be <4>
R1C4 can only be <3>
R3C1 can only be <1>
R1C7 can only be <6>
R6C7 can only be <8>
R6C2 can only be <1>
R7C3 can only be <4>
R9C4 can only be <8>
R9C6 can only be <4>
R1C5 can only be <1>
R9C3 can only be <5>
R7C6 can only be <1>
R1C1 can only be <4>
R1C6 can only be <2>
R3C6 can only be <7>
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