Nov 13 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R7C6 can only be <6>
R5C8 is the only square in row 5 that can be <8>
R4C3 is the only square in column 3 that can be <9>
R4C4 is the only square in column 4 that can be <6>
R4C1 is the only square in row 4 that can be <3>
R6C6 is the only square in row 6 that can be <3>
R6C1 is the only square in block 4 that can be <5>
Squares R5C2 and R6C2 in column 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <17>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R1C2 - removing <7> from <237> leaving <23>
R2C2 - removing <7> from <23678> leaving <2368>
Squares R8C6 and R9C6 in column 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <12>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R1C6 - removing <12> from <1279> leaving <79>
R5C6 - removing <1> from <179> leaving <79>
Squares R1C2 and R2C3 in block 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <23>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
R1C3 - removing <23> from <2345> leaving <45>
R2C2 - removing <23> from <2368> leaving <68>
R3C3 - removing <3> from <35> leaving <5>
R1C3 can only be <4>
R1C1 can only be <7>
R1C6 can only be <9>
R5C6 can only be <7>
R5C2 can only be <1>
R5C4 can only be <5>
R6C2 can only be <7>
R5C5 can only be <9>
R4C5 can only be <2>
R6C7 can only be <6>
R6C9 can only be <2>
R6C5 can only be <1>
R8C5 can only be <4>
R8C1 can only be <6>
R8C7 can only be <7>
R2C7 can only be <9>
R3C1 can only be <8>
R3C5 can only be <7>
R2C2 can only be <6>
R2C5 can only be <8>
R7C5 can only be <5>
R7C7 can only be <4>
R7C1 can only be <9>
R9C7 can only be <5>
R7C9 can only be <3>
R9C1 can only be <4>
R7C2 can only be <8>
R2C9 can only be <7>
R8C8 can only be <1>
R8C6 can only be <2>
R9C8 can only be <6>
R9C9 can only be <9>
R3C8 can only be <3>
R4C9 can only be <5>
R3C4 can only be <1>
R1C8 can only be <5>
R4C8 can only be <7>
R1C9 can only be <1>
R9C2 can only be <2>
R8C3 can only be <3>
R9C6 can only be <1>
R1C2 can only be <3>
R9C4 can only be <8>
R2C3 can only be <2>
R1C4 can only be <2>
R3C9 can only be <6>
R2C4 can only be <3>
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