Nov 28 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R7C5 can only be <8>
R7C9 can only be <4>
R9C4 can only be <2>
R7C2 can only be <3>
R8C4 can only be <4>
R8C6 can only be <6>
R4C4 can only be <7>
R9C6 can only be <9>
R1C4 can only be <1>
R5C4 can only be <3>
R2C4 can only be <8>
R1C7 is the only square in row 1 that can be <3>
R6C3 is the only square in row 6 that can be <3>
Squares R6C6 and R6C8 in row 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <24>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R6C1 - removing <24> from <2479> leaving <79>
R6C7 - removing <4> from <4789> leaving <789>
R6C9 - removing <2> from <278> leaving <78>
Squares R6C1 and R7C1 in column 1 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 column.
R5C1 - removing <79> from <124679> leaving <1246>
Squares R1C3 and R9C3 in column 3 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 column.
R2C3 - removing <5> from <45> leaving <4>
R4C3 - removing <6> from <246> leaving <24>
R5C3 - removing <6> from <246789> leaving <24789>
R8C3 - removing <5> from <258> leaving <28>
R4C3 can only be <2>
R8C3 can only be <8>
R8C2 can only be <1>
R8C7 can only be <5>
R4C2 can only be <6>
R8C1 can only be <2>
R9C7 can only be <1>
R2C7 can only be <7>
R4C7 can only be <4>
R5C2 can only be <8>
R4C1 can only be <1>
R6C8 can only be <2>
R6C6 can only be <4>
R4C9 can only be <5>
R5C1 can only be <4>
R1C9 can only be <6>
R5C8 can only be <1>
R2C8 can only be <5>
R1C3 can only be <5>
R5C9 can only be <7>
R3C7 can only be <8>
R2C6 can only be <2>
R3C8 can only be <4>
R3C9 can only be <2>
R6C7 can only be <9>
R3C5 can only be <5>
R2C9 can only be <1>
R5C3 can only be <9>
R6C9 can only be <8>
R6C1 can only be <7>
R5C7 can only be <6>
R1C6 can only be <7>
R9C3 can only be <6>
R3C1 can only be <6>
R5C6 can only be <5>
R9C1 can only be <5>
R5C5 can only be <2>
R7C3 can only be <7>
R7C1 can only be <9>
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