May 30 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R1C6 is the only square in row 1 that can be <2>
R5C6 can only be <8>
R3C1 is the only square in row 3 that can be <4>
R2C9 is the only square in row 2 that can be <4>
R3C7 is the only square in row 3 that can be <5>
R2C1 is the only square in row 2 that can be <5>
R4C6 is the only square in row 4 that can be <4>
R4C2 is the only square in row 4 that can be <8>
R9C2 can only be <6>
R9C1 can only be <8>
R9C3 can only be <4>
R4C5 is the only square in row 4 that can be <9>
R4C9 is the only square in row 4 that can be <2>
R5C9 can only be <1>
R6C8 is the only square in row 6 that can be <5>
R7C4 is the only square in row 7 that can be <4>
R7C5 is the only square in row 7 that can be <2>
R9C9 is the only square in row 9 that can be <5>
R8C6 is the only square in row 8 that can be <5>
R3C6 is the only square in column 6 that can be <7>
R3C5 can only be <8>
R8C4 is the only square in row 8 that can be <8>
Squares R8C5 and R8C9 in row 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <67>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R8C7 - removing <7> from <137> leaving <13>
Squares R5C1 and R8C1 in column 1 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 column.
R6C1 - removing <23> from <2369> leaving <69>
Intersection of row 1 with block 1. The value <6> only appears in one or more of squares R1C1, R1C2 and R1C3 of row 1. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.
R2C3 - removing <6> from <168> leaving <18>
Squares R2C3 and R2C8 in row 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <18>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R2C4 - removing <1> from <139> leaving <39>
R3C4 is the only square in column 4 that can be <1>
R3C2 can only be <9>
R6C2 can only be <2>
R1C1 can only be <6>
R8C2 can only be <1>
R5C1 can only be <3>
R8C7 can only be <3>
R7C3 can only be <3>
R8C1 can only be <2>
R4C7 can only be <7>
R7C8 can only be <1>
R6C1 can only be <9>
R4C8 can only be <3>
R9C7 can only be <9>
R5C4 can only be <2>
R6C3 can only be <6>
R2C8 can only be <8>
R9C4 can only be <7>
R1C7 can only be <1>
R7C9 can only be <6>
R1C3 can only be <8>
R2C3 can only be <1>
R1C8 can only be <7>
R7C6 can only be <9>
R8C9 can only be <7>
R8C5 can only be <6>
R1C9 can only be <9>
R6C4 can only be <3>
R6C5 can only be <7>
R2C4 can only be <9>
R2C6 can only be <6>
R2C5 can only be <3>
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