Feb 01 - Very Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R1C1 can only be <2>
R1C5 can only be <1>
R5C1 can only be <5>
R9C1 can only be <7>
R9C9 can only be <8>
R1C9 can only be <4>
R5C9 can only be <1>
R9C5 can only be <6>
R5C5 can only be <3>
R2C7 is the only square in row 2 that can be <3>
R3C2 is the only square in row 3 that can be <7>
R3C8 is the only square in row 3 that can be <8>
R3C4 is the only square in row 3 that can be <9>
R4C6 is the only square in row 4 that can be <1>
R7C8 is the only square in row 7 that can be <5>
R7C3 is the only square in row 7 that can be <9>
R8C7 is the only square in row 8 that can be <2>
R8C2 is the only square in row 8 that can be <6>
Squares R4C5 and R4C7 in row 4 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 row.
R4C8 - removing <7> from <47> leaving <4>
Squares R4C5 and R6C5 in block 5 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 block.
R6C6 - removing <7> from <245678> leaving <24568>
Squares R5C4 and R5C6 in block 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <46>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
R6C4 - removing <46> from <24568> leaving <258>
R6C6 - removing <46> from <24568> leaving <258>
Squares R4C5, R4C7, R6C5 and R6C7 form a Type-1 Unique Rectangle on <79>.
R6C7 - removing <79> from <679> leaving <6>
R6C8 can only be <7>
R3C7 can only be <1>
R6C5 can only be <9>
R8C8 can only be <1>
R4C7 can only be <9>
R8C3 can only be <3>
R2C8 can only be <6>
R7C7 can only be <7>
R3C3 can only be <5>
R4C5 can only be <7>
R7C6 can only be <8>
R8C4 can only be <4>
R4C3 can only be <8>
R7C2 can only be <1>
R8C6 can only be <7>
R5C4 can only be <6>
R3C6 can only be <6>
R5C6 can only be <4>
R4C4 can only be <2>
R6C3 can only be <4>
R4C2 can only be <3>
R2C4 can only be <5>
R6C2 can only be <2>
R2C3 can only be <1>
R2C2 can only be <4>
R7C4 can only be <3>
R6C6 can only be <5>
R2C6 can only be <2>
R6C4 can only be <8>
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