Nov 30 - Very Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R5C8 can only be <8>
R5C6 can only be <1>
R5C4 can only be <3>
R7C6 can only be <4>
R8C5 can only be <7>
R8C1 can only be <1>
R7C4 can only be <1>
R7C3 can only be <3>
R2C8 is the only square in row 2 that can be <1>
R1C3 is the only square in row 1 that can be <1>
R2C1 is the only square in row 2 that can be <6>
R4C5 is the only square in row 4 that can be <5>
R5C5 can only be <2>
R5C2 can only be <5>
R4C4 is the only square in row 4 that can be <7>
R7C1 is the only square in row 7 that can be <5>
R8C8 is the only square in row 8 that can be <6>
R1C7 is the only square in row 1 that can be <6>
R9C7 is the only square in row 9 that can be <1>
R9C9 is the only square in row 9 that can be <3>
Squares R4C3 and R6C3 in column 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <26>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R3C3 - removing <2> from <249> leaving <49>
R9C3 - removing <2> from <249> leaving <49>
Squares R9C3 and R9C8 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.
R9C2 - removing <49> from <2479> leaving <27>
Squares R4C7 and R6C7 in column 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <29>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R3C7 - removing <29> from <2789> leaving <78>
Squares R1C8 and R3C3 form a remote naked pair. <49> can be removed from any square that is common to their groups.
R3C9 - removing <49> from <24789> leaving <278>
R1C2 - removing <49> from <249> leaving <2>
R1C1 can only be <8>
R9C2 can only be <7>
R9C1 can only be <2>
R2C2 can only be <4>
R3C1 can only be <7>
R2C5 can only be <8>
R8C2 can only be <9>
R3C3 can only be <9>
R2C9 can only be <7>
R6C5 can only be <4>
R3C6 can only be <6>
R7C9 can only be <8>
R3C7 can only be <8>
R9C3 can only be <4>
R3C4 can only be <4>
R4C6 can only be <9>
R3C9 can only be <2>
R7C7 can only be <7>
R4C7 can only be <2>
R6C6 can only be <8>
R4C3 can only be <6>
R6C7 can only be <9>
R6C4 can only be <6>
R8C9 can only be <4>
R1C9 can only be <9>
R9C8 can only be <9>
R1C8 can only be <4>
R6C3 can only be <2>
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