Mar 20 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R4C1 is the only square in row 4 that can be <6>
R7C8 is the only square in row 7 that can be <8>
R4C9 is the only square in row 4 that can be <8>
R6C2 is the only square in row 6 that can be <8>
R6C1 is the only square in row 6 that can be <3>
R8C5 is the only square in row 8 that can be <8>
R8C6 is the only square in row 8 that can be <5>
R3C8 is the only square in row 3 that can be <5>
R4C8 can only be <2>
R1C5 is the only square in row 1 that can be <5>
R1C6 is the only square in row 1 that can be <4>
R4C7 is the only square in row 4 that can be <5>
R5C3 is the only square in row 5 that can be <5>
R9C5 is the only square in row 9 that can be <6>
R2C6 is the only square in row 2 that can be <6>
R3C2 is the only square in row 3 that can be <6>
R9C9 is the only square in column 9 that can be <9>
R1C1 is the only square in block 1 that can be <7>
R1C8 can only be <1>
R5C9 is the only square in row 5 that can be <1>
R6C6 is the only square in row 6 that can be <1>
R8C1 is the only square in column 1 that can be <1>
Squares R2C3 and R3C3 in column 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <19>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R8C3 - removing <9> from <249> leaving <24>
Squares R7C7 and R8C7 in column 7 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.
R2C7 - removing <27> from <2347> leaving <34>
R5C7 - removing <7> from <347> leaving <34>
Squares R4C4 and R4C5 in block 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <49>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
R5C5 - removing <49> from <2479> leaving <27>
R6C5 - removing <4> from <247> leaving <27>
R4C5 is the only square in column 5 that can be <4>
R4C4 can only be <9>
R8C2 is the only square in row 8 that can be <9>
R5C2 can only be <4>
R7C1 can only be <2>
R5C7 can only be <3>
R6C3 can only be <2>
R5C8 can only be <7>
R2C7 can only be <4>
R5C5 can only be <2>
R2C8 can only be <3>
R6C9 can only be <4>
R6C5 can only be <7>
R8C3 can only be <4>
R5C1 can only be <9>
R7C7 can only be <7>
R7C2 can only be <3>
R7C6 can only be <9>
R8C7 can only be <2>
R8C4 can only be <7>
R9C4 can only be <3>
R9C2 can only be <7>
R7C4 can only be <4>
R2C5 can only be <9>
R3C6 can only be <7>
R2C3 can only be <1>
R3C9 can only be <2>
R3C4 can only be <1>
R2C9 can only be <7>
R2C4 can only be <2>
R3C3 can only be <9>
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