Oct 03 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R1C7 can only be <9>
R9C3 is the only square in block 7 that can be <6>
Squares R2C5 and R2C8 in row 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <68>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R2C4 - removing <6> from <2469> leaving <249>
R2C6 - removing <8> from <2489> leaving <249>
Squares R5C4 and R5C6 in row 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <37>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R5C1 - removing <7> from <12679> leaving <1269>
R5C2 - removing <3> from <123589> leaving <12589>
R5C3 - removing <7> from <2789> leaving <289>
R5C8 - removing <37> from <356789> leaving <5689>
Squares R1C3 and R4C3 in column 3 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.
R5C3 - removing <2> from <289> leaving <89>
R6C3 - removing <7> from <789> leaving <89>
Squares R5C3 and R6C3 in block 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <89>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
R5C1 - removing <9> from <1269> leaving <126>
R5C2 - removing <89> from <12589> leaving <125>
R6C1 - removing <9> from <79> leaving <7>
R6C2 - removing <89> from <34589> leaving <345>
R4C3 can only be <2>
R4C9 can only be <6>
R1C3 can only be <7>
R4C1 can only be <1>
R4C7 can only be <4>
R3C1 can only be <9>
R5C1 can only be <6>
R5C2 can only be <5>
R4C2 can only be <3>
R6C7 can only be <8>
R6C3 can only be <9>
R9C7 can only be <2>
R5C8 can only be <9>
R5C7 can only be <1>
R7C1 can only be <2>
R2C2 can only be <2>
R4C8 can only be <7>
R6C2 can only be <4>
R5C3 can only be <8>
R5C9 can only be <2>
R8C8 can only be <8>
R6C9 can only be <5>
R6C8 can only be <3>
R3C9 can only be <8>
R8C2 can only be <9>
R2C8 can only be <6>
R9C8 can only be <4>
R7C9 can only be <9>
R1C2 can only be <1>
R2C5 can only be <8>
R1C8 can only be <5>
R9C2 can only be <8>
R7C5 can only be <3>
R7C4 can only be <4>
R1C5 can only be <6>
R8C5 can only be <7>
R7C6 can only be <8>
R2C4 can only be <9>
R8C6 can only be <2>
R8C4 can only be <6>
R1C6 can only be <3>
R1C4 can only be <2>
R5C6 can only be <7>
R2C6 can only be <4>
R9C4 can only be <5>
R5C4 can only be <3>
R3C6 can only be <1>
R9C5 can only be <1>
R3C4 can only be <7>
R9C6 can only be <9>
R3C5 can only be <5>
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