Jun 29 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R1C5 is the only square in row 1 that can be <6>
R1C7 is the only square in row 1 that can be <5>
R1C9 is the only square in row 1 that can be <4>
R2C8 is the only square in row 2 that can be <9>
R2C2 is the only square in row 2 that can be <3>
R7C5 is the only square in row 7 that can be <9>
R9C5 is the only square in row 9 that can be <1>
R2C6 is the only square in row 2 that can be <1>
R9C3 is the only square in row 9 that can be <4>
R9C9 is the only square in row 9 that can be <8>
R7C3 is the only square in column 3 that can be <5>
R8C5 is the only square in column 5 that can be <3>
R8C4 is the only square in row 8 that can be <4>
R3C5 is the only square in row 3 that can be <4>
R8C6 is the only square in row 8 that can be <5>
R5C6 is the only square in column 6 that can be <6>
R7C9 is the only square in column 9 that can be <6>
R3C4 is the only square in block 2 that can be <7>
R3C6 is the only square in row 3 that can be <8>
R7C6 can only be <2>
R7C4 can only be <8>
Squares R3C7 and R3C9 in row 3 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.
R3C1 - removing <2> from <129> leaving <19>
R3C3 - removing <2> from <129> leaving <19>
Squares R1C3 and R6C3 in column 3 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.
R4C3 - removing <27> from <2379> leaving <39>
R5C3 - removing <27> from <12379> leaving <139>
Squares R3C7 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 <23> from <23679> leaving <679>
R5C7 - removing <23> from <23479> leaving <479>
R6C7 - removing <2> from <2467> leaving <467>
R7C7 - removing <3> from <37> leaving <7>
R7C1 can only be <3>
R8C8 can only be <2>
R8C2 can only be <7>
R9C7 can only be <3>
R9C1 can only be <2>
R3C7 can only be <2>
R3C9 can only be <3>
R5C9 can only be <2>
R5C4 can only be <5>
R5C2 can only be <4>
R1C1 can only be <7>
R1C3 can only be <2>
R6C3 can only be <7>
R5C7 can only be <9>
R2C4 can only be <2>
R5C1 can only be <1>
R4C7 can only be <6>
R6C8 can only be <8>
R6C5 can only be <2>
R2C5 can only be <5>
R4C2 can only be <2>
R6C7 can only be <4>
R5C3 can only be <3>
R3C1 can only be <9>
R5C8 can only be <7>
R4C3 can only be <9>
R5C5 can only be <8>
R4C8 can only be <3>
R6C2 can only be <6>
R4C5 can only be <7>
R3C3 can only be <1>
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