May 08 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R2C6 can only be <9>
R7C1 can only be <7>
R9C6 can only be <4>
R5C6 can only be <8>
R2C2 is the only square in row 2 that can be <8>
R2C8 is the only square in row 2 that can be <1>
R3C5 is the only square in row 3 that can be <4>
R5C5 can only be <3>
R5C4 can only be <4>
R2C5 can only be <6>
R2C4 can only be <3>
R1C4 can only be <7>
R1C6 can only be <5>
R8C4 can only be <2>
R8C6 can only be <7>
R9C4 can only be <6>
R7C8 is the only square in row 7 that can be <8>
Squares R4C1 and R4C7 in row 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <38>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R4C2 - removing <3> from <3467> leaving <467>
R4C3 - removing <3> from <36> leaving <6>
R4C8 - removing <3> from <3479> leaving <479>
R4C9 - removing <3> from <39> leaving <9>
Squares R1C7 and R9C7 in column 7 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.
R4C7 - removing <3> from <38> leaving <8>
R5C7 - removing <2> from <125> leaving <15>
R6C7 - removing <23> from <12358> leaving <158>
R4C1 can only be <3>
R3C1 can only be <1>
R6C1 can only be <8>
Squares R5C3 and R6C3 in column 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <12>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R9C3 - removing <12> from <1239> leaving <39>
R9C2 is the only square in row 9 that can be <1>
R7C2 is the only square in block 7 that can be <2>
R7C9 can only be <5>
R7C5 can only be <9>
R3C9 can only be <3>
R3C2 can only be <6>
R6C9 can only be <2>
R1C7 can only be <2>
R6C3 can only be <1>
R8C5 can only be <5>
R1C8 can only be <6>
R9C7 can only be <3>
R3C8 can only be <5>
R5C8 can only be <7>
R5C2 can only be <5>
R4C8 can only be <4>
R6C7 can only be <5>
R5C3 can only be <2>
R6C2 can only be <4>
R5C7 can only be <1>
R9C3 can only be <9>
R8C8 can only be <9>
R4C2 can only be <7>
R6C8 can only be <3>
R8C2 can only be <3>
R9C8 can only be <2>
R1C3 can only be <3>
R1C2 can only be <9>
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