Oct 19 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R8C6 can only be <2>
R5C3 is the only square in row 5 that can be <4>
R8C9 is the only square in row 8 that can be <6>
R8C1 is the only square in row 8 that can be <1>
R6C9 is the only square in column 9 that can be <5>
Squares R2C4 and R2C5 in row 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <48>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R2C1 - removing <48> from <24678> leaving <267>
R2C6 - removing <8> from <68> leaving <6>
R2C9 - removing <8> from <278> leaving <27>
R1C1 is the only square in column 1 that can be <4>
R3C1 is the only square in column 1 that can be <6>
R3C7 can only be <8>
R4C9 is the only square in column 9 that can be <8>
R6C1 is the only square in column 1 that can be <8>
R6C2 is the only square in row 6 that can be <9>
R1C2 is the only square in column 2 that can be <8>
Squares R2C1 and R4C1 in column 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <27>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R7C1 - removing <2> from <259> leaving <59>
R9C1 - removing <27> from <2579> leaving <59>
Squares R7C1 and R9C1 in block 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <59>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
R7C3 - removing <9> from <239> leaving <23>
R9C3 - removing <9> from <2379> leaving <237>
Squares R8C4 and R8C5 in block 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <39>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
R7C5 - removing <39> from <3459> leaving <45>
R9C4 - removing <39> from <34589> leaving <458>
R8C4 is the only square in column 4 that can be <3>
R8C5 can only be <9>
R3C5 can only be <1>
R3C9 can only be <7>
R1C6 can only be <5>
R3C3 can only be <9>
R2C9 can only be <2>
R1C4 can only be <9>
R9C6 can only be <8>
R2C1 can only be <7>
R1C3 can only be <2>
R5C6 can only be <1>
R7C3 can only be <3>
R4C1 can only be <2>
R4C5 can only be <3>
R4C8 can only be <7>
R6C5 can only be <2>
R4C2 can only be <1>
R5C2 can only be <7>
R6C8 can only be <3>
R7C9 can only be <4>
R9C3 can only be <7>
R7C5 can only be <5>
R9C2 can only be <2>
R7C1 can only be <9>
R5C5 can only be <8>
R9C4 can only be <4>
R9C8 can only be <1>
R2C4 can only be <8>
R9C9 can only be <3>
R1C8 can only be <6>
R9C7 can only be <9>
R1C9 can only be <1>
R1C7 can only be <3>
R5C8 can only be <2>
R2C5 can only be <4>
R5C4 can only be <5>
R5C7 can only be <6>
R7C7 can only be <2>
R9C1 can only be <5>
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