Aug 02 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R4C8 can only be <1>
R4C6 can only be <2>
R4C9 can only be <9>
R4C4 can only be <6>
R4C2 can only be <3>
R5C3 is the only square in row 5 that can be <6>
R3C2 is the only square in row 3 that can be <6>
R6C1 is the only square in row 6 that can be <2>
R6C6 is the only square in row 6 that can be <7>
R7C5 is the only square in row 7 that can be <6>
R9C9 is the only square in row 9 that can be <7>
R7C1 is the only square in row 7 that can be <7>
R8C3 is the only square in column 3 that can be <2>
R7C9 is the only square in column 9 that can be <2>
R3C9 is the only square in block 3 that can be <5>
Squares R8C1 and R8C2 in row 8 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 row.
R8C5 - removing <19> from <1389> leaving <38>
R8C7 - removing <19> from <1349> leaving <34>
R8C9 - removing <1> from <148> leaving <48>
R2C9 is the only square in column 9 that can be <1>
Squares R2C7 and R2C8 in row 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <34>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R2C1 - removing <3> from <389> leaving <89>
R2C3 - removing <4> from <47> leaving <7>
R2C5 - removing <3> from <3789> leaving <789>
R3C5 is the only square in row 3 that can be <7>
R3C4 is the only square in row 3 that can be <2>
R9C5 is the only square in row 9 that can be <2>
Squares R2C7 and R8C7 in column 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <34>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R5C7 - removing <4> from <45> leaving <5>
R7C7 - removing <3> from <139> leaving <19>
R9C7 - removing <4> from <1459> leaving <159>
R5C1 can only be <1>
R6C8 can only be <8>
R6C4 can only be <1>
R7C8 can only be <3>
R5C9 can only be <4>
R2C8 can only be <4>
R8C7 can only be <4>
R8C9 can only be <8>
R2C7 can only be <3>
R9C8 can only be <5>
R8C5 can only be <3>
R5C5 can only be <8>
R3C1 can only be <3>
R8C1 can only be <9>
R6C2 can only be <5>
R2C5 can only be <9>
R8C2 can only be <1>
R2C1 can only be <8>
R1C2 can only be <9>
R1C5 can only be <1>
R1C3 can only be <4>
R3C6 can only be <4>
R1C1 can only be <5>
R3C3 can only be <1>
R9C6 can only be <1>
R1C4 can only be <8>
R9C7 can only be <9>
R7C6 can only be <8>
R9C4 can only be <4>
R7C7 can only be <1>
R1C6 can only be <3>
R7C4 can only be <9>
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