Oct 14 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R1C4 is the only square in row 1 that can be <3>
R2C8 is the only square in row 2 that can be <8>
R6C9 is the only square in row 6 that can be <9>
R7C8 is the only square in row 7 that can be <5>
R7C2 is the only square in row 7 that can be <3>
R8C5 is the only square in row 8 that can be <2>
R8C2 is the only square in column 2 that can be <8>
R9C8 is the only square in column 8 that can be <3>
R8C8 is the only square in column 8 that can be <7>
R9C9 is the only square in column 9 that can be <8>
R9C6 is the only square in block 8 that can be <1>
R9C7 can only be <6>
Squares R5C4 and R5C6 in row 5 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 row.
R5C2 - removing <56> from <1456> leaving <14>
Squares R8C7 and R8C9 in row 8 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 row.
R8C4 - removing <4> from <469> leaving <69>
Squares R5C4 and R5C6 in block 5 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 block.
R4C6 - removing <5> from <578> leaving <78>
R6C4 - removing <56> from <568> leaving <8>
R6C5 - removing <6> from <136> leaving <13>
R6C1 can only be <6>
R4C6 can only be <7>
R1C1 can only be <4>
R4C1 can only be <8>
R7C6 is the only square in row 7 that can be <8>
R5C2 is the only square in column 2 that can be <4>
R5C8 can only be <1>
R3C8 can only be <4>
R3C5 can only be <7>
R2C5 is the only square in row 2 that can be <4>
R7C5 can only be <6>
R7C3 can only be <7>
R8C4 can only be <9>
R8C3 can only be <6>
R3C4 can only be <5>
R9C4 can only be <7>
R9C1 can only be <9>
R7C4 can only be <4>
R3C2 can only be <1>
R5C4 can only be <6>
R5C6 can only be <5>
R2C1 can only be <7>
R3C7 can only be <2>
R3C6 can only be <9>
R2C7 can only be <5>
R2C2 can only be <6>
R6C7 can only be <3>
R1C9 can only be <1>
R6C5 can only be <1>
R4C7 can only be <4>
R8C9 can only be <4>
R2C6 can only be <2>
R1C2 can only be <5>
R2C3 can only be <9>
R1C6 can only be <6>
R4C9 can only be <5>
R8C7 can only be <1>
R4C3 can only be <1>
R6C3 can only be <5>
R4C5 can only be <3>
R1C3 can only be <2>
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