Nov 03 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R7C4 is the only square in row 7 that can be <2>
R2C1 is the only square in column 1 that can be <8>
R9C1 is the only square in column 1 that can be <5>
R8C1 is the only square in column 1 that can be <6>
R9C8 is the only square in row 9 that can be <6>
R5C2 is the only square in column 2 that can be <8>
Squares R5C8 and R6C9 in block 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <47>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
R6C7 - removing <7> from <257> leaving <25>
R6C8 - removing <47> from <2457> leaving <25>
Squares R6C7 and R6C8 in row 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <25>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R6C5 - removing <5> from <579> leaving <79>
R6C6 - removing <5> from <5789> leaving <789>
Squares R6C6, R8C6 and R9C6 in column 6 form a simple naked triplet. These 3 squares all contain the 3 possibilities <789>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R3C6 - removing <7> from <127> leaving <12>
R4C6 - removing <7> from <157> leaving <15>
R5C6 - removing <7> from <67> leaving <6>
R3C8 is the only square in row 3 that can be <7>
R5C8 can only be <4>
R5C4 can only be <7>
R6C9 can only be <7>
R6C5 can only be <9>
R7C9 can only be <9>
R2C9 can only be <1>
R1C9 can only be <8>
R2C4 can only be <6>
R6C6 can only be <8>
R6C4 can only be <4>
R8C9 can only be <4>
R2C3 can only be <9>
R1C4 can only be <1>
R4C4 can only be <3>
R3C6 can only be <2>
R2C8 can only be <2>
R2C2 can only be <5>
R6C8 can only be <5>
R1C7 can only be <3>
R3C1 can only be <4>
R1C6 can only be <5>
R4C5 can only be <5>
R9C4 can only be <8>
R4C6 can only be <1>
R2C5 can only be <7>
R6C7 can only be <2>
R7C8 can only be <3>
R7C2 can only be <7>
R1C8 can only be <9>
R8C8 can only be <1>
R9C7 can only be <7>
R9C6 can only be <9>
R7C7 can only be <5>
R8C7 can only be <8>
R1C2 can only be <2>
R1C3 can only be <6>
R8C5 can only be <3>
R3C3 can only be <3>
R4C1 can only be <2>
R3C2 can only be <1>
R9C3 can only be <4>
R4C2 can only be <4>
R8C2 can only be <9>
R4C3 can only be <7>
R9C2 can only be <3>
R8C6 can only be <7>
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