Feb 06 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R7C6 can only be <5>
R3C1 is the only square in row 3 that can be <6>
R4C1 is the only square in row 4 that can be <4>
R7C9 is the only square in row 7 that can be <7>
R5C2 is the only square in column 2 that can be <7>
R6C5 is the only square in row 6 that can be <7>
R8C4 is the only square in column 4 that can be <6>
R2C5 is the only square in column 5 that can be <3>
R6C6 is the only square in column 6 that can be <6>
R4C4 is the only square in block 5 that can be <1>
R8C3 is the only square in block 7 that can be <1>
R8C1 is the only square in row 8 that can be <7>
R2C1 can only be <9>
R6C1 can only be <5>
R1C3 is the only square in row 1 that can be <5>
R2C3 is the only square in row 2 that can be <7>
R6C3 is the only square in column 3 that can be <9>
Squares R7C4 and R7C5 in row 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 row.
R7C7 - removing <2> from <123> leaving <13>
Squares R9C1 and R9C3 in row 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <23>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R9C7 - removing <23> from <23568> leaving <568>
R9C8 - removing <3> from <368> leaving <68>
R8C7 is the only square in column 7 that can be <2>
Squares R4C5 and R5C5 in column 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <58>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R3C5 - removing <8> from <2489> leaving <249>
R8C5 - removing <8> from <48> leaving <4>
R8C9 can only be <8>
R9C6 can only be <8>
R6C9 can only be <1>
R9C8 can only be <6>
R2C6 can only be <1>
R9C7 can only be <5>
R2C9 can only be <6>
R3C6 can only be <4>
R2C7 can only be <8>
R6C8 can only be <8>
R1C9 can only be <9>
R9C9 can only be <4>
R4C9 can only be <5>
R1C7 can only be <1>
R4C5 can only be <8>
R5C8 can only be <3>
R7C7 can only be <3>
R4C2 can only be <3>
R5C5 can only be <5>
R5C3 can only be <8>
R5C7 can only be <6>
R7C8 can only be <1>
R4C7 can only be <9>
R1C2 can only be <8>
R3C3 can only be <2>
R1C4 can only be <2>
R3C2 can only be <1>
R1C1 can only be <3>
R7C4 can only be <9>
R3C5 can only be <9>
R9C3 can only be <3>
R3C4 can only be <8>
R7C5 can only be <2>
R9C1 can only be <2>
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