Jun 07 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R4C5 is the only square in row 4 that can be <3>
R6C3 is the only square in row 6 that can be <3>
R7C5 is the only square in row 7 that can be <7>
R9C6 is the only square in column 6 that can be <8>
R5C6 is the only square in column 6 that can be <6>
R9C9 is the only square in column 9 that can be <3>
R3C7 is the only square in column 7 that can be <3>
R4C7 is the only square in column 7 that can be <6>
R4C9 is the only square in row 4 that can be <7>
R1C7 is the only square in row 1 that can be <7>
R8C8 is the only square in block 9 that can be <1>
R7C8 is the only square in column 8 that can be <4>
R6C8 is the only square in column 8 that can be <9>
Squares R1C8 and R1C9 in row 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <28>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R1C1 - removing <2> from <1249> leaving <149>
R1C6 - removing <2> from <24> leaving <4>
R5C5 is the only square in column 5 that can be <4>
Squares R1C8 and R1C9 in block 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <28>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
R2C8 - removing <2> from <256> leaving <56>
R3C8 - removing <28> from <2568> leaving <56>
R1C8 is the only square in column 8 that can be <8>
R1C9 can only be <2>
R4C8 is the only square in column 8 that can be <2>
Squares R4C1 and R4C2 in block 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <45>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
R5C1 - removing <5> from <259> leaving <29>
R6C1 - removing <5> from <56> leaving <6>
R6C2 - removing <5> from <568> leaving <68>
R6C2 can only be <8>
R3C3 is the only square in row 3 that can be <8>
R9C3 is the only square in column 3 that can be <4>
R8C4 is the only square in row 8 that can be <4>
R8C6 is the only square in row 8 that can be <3>
R2C4 is the only square in row 2 that can be <3>
R1C4 is the only square in column 4 that can be <9>
R1C1 can only be <1>
R9C1 can only be <5>
R9C4 can only be <6>
R4C1 can only be <4>
R8C2 can only be <9>
R9C2 can only be <1>
R7C4 can only be <5>
R4C2 can only be <5>
R3C1 can only be <2>
R7C9 can only be <8>
R5C4 can only be <1>
R7C7 can only be <9>
R8C7 can only be <5>
R5C7 can only be <8>
R3C6 can only be <5>
R5C1 can only be <9>
R2C2 can only be <6>
R3C5 can only be <1>
R3C8 can only be <6>
R2C6 can only be <2>
R3C2 can only be <4>
R2C8 can only be <5>
R5C3 can only be <2>
R7C3 can only be <6>
R5C9 can only be <5>
R6C5 can only be <5>
R6C9 can only be <1>
R7C2 can only be <2>
R2C3 can only be <9>
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